25 kV Source Transfer PMH Pad- Mounted Gear

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Specifications

Product Name: S&C Source-Transfer PMH
Pad-Mounted Gear Outdoor Distribution (14.4 kV and 25 kV)

Features:

• Provides fully automatic primary-selective service and fault
  protection for one or two critical load circuits on solidly
  grounded systems

• Decouplers for exercising switch operators without affecting
  switch positions

• High-speed source transfer achieved in 10 cycles with
  stored-energy Mini-Rupter Switches

• Automatic solenoid Trip Open and Trip Closed operation

• Micro-AT Source-Transfer Control for control operations

• Grounded, steel-enclosed, low-voltage compartment with fully
  gasketed door openings

• S&C Voltage Sensors for three-phase sensing, control power,
  and supply power

Product Usage Instructions

Installation and Setup

1. Ensure proper grounding of the gear according to manufacturer
   guidelines.

2. Connect the necessary cables to the designated terminals as per
   the provided wiring diagram.

3. Verify that all connections are secure before energizing the
   system.

Operation

1. Power on the gear using the designated switch or control
   panel.

2. Monitor the status indicators to ensure proper
   functioning.

3. In case of a fault or emergency, follow the emergency shutdown
   procedure provided in the manual.

Maintenance

1. Regularly inspect the gear for signs of wear, damage, or
   corrosion.

2. Clean the gear and surrounding area to prevent dust
   accumulation.

3. Perform periodic tests as recommended by the manufacturer to
   ensure continued reliability.

Specifications Bulletin 663A-31

S&C Source-Transfer PMH Pad-Mounted Gear is designed for
outdoor use but requires proper cable-terminating devices to
protect against exposure to elements.

Exclusions

Refer to Table 3 on page 6 for exclusions and items not included
in certain units as detailed in the manual.

Specification Deviations

Custom modifications or additions beyond those listed in Table 4
on pages 7 through 9 are not accommodated. Contact S&C Sales
Office for specific requests.

FAQ

Q: How often should maintenance be performed on the gear?

A: Regular maintenance should be conducted according to the
manufacturer’s recommendations, typically at least once a year or
as specified in the manual.

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S&C Source-Transfer PMH Pad-Mounted Gear Outdoor Distribution (14.4 kV and 25 kV)

With Micro-AT® Control

Specifications

Conditions of Sale
STANDARD: The seller’s standard conditions of sale set forth in Price Sheet 150 apply, except as modified under the “Warranty Qualifications” section on page 4.
SPECIAL TO THIS PRODUCT:
INCLUSIONS: Source-Transfer PMH Pad-Mounted Gear provides fully automatic primary-selective service and fault protection for one or two critical load circuits on solidly grounded systems. These models contain:
Stored-energy switch-operator-driven 600-ampere Mini-Rupter® Switches for three-pole live switching of three-phase source circuits
A totally self-contained automatic source-transfer package with S&C Voltage Sensors for sensing and control power, and the Micro-AT® Source-Transfer Control for programmed control of all switching functions associated with automatic source transfer
Decouplers to permit exercising the switch operators without affecting the position of the switches
200-ampere hookstick-operated S&C Power Fuses with Uni-Rupter® Interrupters for single-pole live switching of single-phase or three-phase load circuits (These models offer a choice of S&C Type SML-20 and SML-4Z Power Fuses or Fault Fiter® Electronic Power Fuses. Fault Fiter Electronic Power Fuse mountings also accommodate a variety of singlebarrel current-limiting fuses as listed in Table 1 of S&C Information Bulletin 660-50.)
The stored-energy switch-operator-driven Mini-Rupter Switches on the source circuits provide highspeed source transfer for primary-selective systems. The transfer is achieved in 10 cycles, plus any intentional time delay for coordination.

The stored-energy operators are motor-charged with automatic solenoid Trip Open and Trip Closed operation. Automatic tripping of the operators is initiated by the Micro-AT Source-Transfer Control, which uses an advanced electronic microprocessor to perform control operations in accordance with settings programmed into the device at the factory and in the field.
The stored-energy operators and source-transfer control are isolated from medium voltage in a grounded, steel-enclosed, low-voltage compartment that has fully gasketed door openings. S&C Voltage Sensors–three for each source–provide three-phase sensing, control power, and supply power for motor charging and tripping.
Enclosures meet the requirements of ANSI C57.12.28 (enclosure integrity). They are of free-standing, self-supporting construction, not for bolting directly to transformers, with provisions for cable entrance and exit through the bottom. Access to medium-voltage and low-voltage compartments is controlled by the Penta-Latch® Mechanism. The Penta-Latch Mechanism provides automatic door latching and permits padlocking only when the door is securely latched. The door can be opened only with a pentahead socket wrench or tool.
The enclosure roof is undercoated with an insulating “no-drip” compound. A resilient closed-cell gasket on the enclosure bottom flange protects the finish from being scratched during installation and isolates it from the alkalinity of a concrete foundation. S&C Pad-Mounted Gear is protected from corrosion by S&C’s olive green Ultradur® II Outdoor Finish.

March 11, 2024 © S&C Electric Company 1991­2024, all rights reserved

Specification Bulletin 663A-31

S&C Source-Transfer PMH Pad-Mounted Gear

A dual-purpose front barrier of fiberglass-reinforced polyester is provided for each switch and fuse. Where the National Electric Safety Code (ANSI Standard C2) applies, these barriers meet the requirements of Section 381G. When the switch or fuse is in the Open position, this barrier can be inserted into the open gap to guard against inadvertent contact with live parts. Interphase and end-barriers of the same material are provided with each switch and each set of fuses where required to achieve published BIL ratings. Additional barriers of fiberglass-reinforced polyester separate front and rear compartments and isolate the tie bus. Full-length steel barriers separate adjoining compartments.
These PMH models are provided with a GrapplerTM Handling Tool (S&C fuse- handling fitting), an instruction manual holder on the inside of the control- compartment door, and storage racks in the fuse-compartment doors for spare S&C Fuse Units or Refill Units and for the Grappler tool (storage for Fault Fiter Electronic Power Fuses or current-limiting fuses cannot be provided in these racks). Terminal pads can accommodate a variety of cable-terminating devices for cable sizes through 1000 kc mil for switch terminals, 4/0 maximum for fuse terminals. Each switch and fuse terminal is provided with a ground stud as is each ground pad.
The cable-terminating devices must be equipped either with an offset spade- type compression terminal for bolting directly to the terminal pad or with a rod-type compression terminal for attachment to a connector of the type shown in Table 18 on page 17. For applications where additional height is desired for increased elevation of ungrounded parts above the mounting pad, and to facilitate cable pulling and makeup of cable-terminating devices, particularly where no cable pit is used, base spacers are available as listed in Table 4 on page 7.
While the interior of S&C Pad-Mounted Gear is protected from direct exposure to the elements, it is inherently an outdoor environment requiring selection and application of cable-terminating devices accordingly. Terminations must incorporate adequate leakage distance between the exposed conductor and the stress-relief cone across a surface of nontracking material (or a surface rendered nontracking by properly taping with a suitable material).

Furthermore, to maintain the rated BIL, the following minimum clearances are required: 6 inches (152 mm) at 14.4 kV and 7½ inches (191 mm) at 25 kV from energized parts to electrical ground; 1 inch (25 mm) at 14.4 kV and 2¼ inches (57 mm) at 25 kV from energized parts to fiberglass-reinforced polyester barriers; ½-inch (13 mm) at 14.4 kV and 1¼ inches (32 mm) at 25 kV from terminator skirts to fiberglass-reinforced polyester barriers.
EXCLUSIONS: Three-phase units listed in Table 3 on page 6 do not include the items listed in Table 4 on pages 7 through 9, nor do they include the connector, fuse components, switch blades, or accessories listed in Table 5, Table 6, and Table 7 on page 10, Table 14 and Table 15 on page 16, and Table 18 on page 17.
SPECIFICATION DEVIATIONS: Features or modifications other than those listed in Table 4 on pages 7 through 9 cannot be accommodated. Specifically, the following modifications or additions are not available except in custom-design gear or other standard models of S&C gear:
Relocation of components (switches, fuses, storedenergy operators, and source- transfer control)
Inclusion in fuse compartments of surge arresters or porcelain cable- terminating devices
Separable insulated connectors (either 200 or 600 ampere)
Intermediate- or station-class surge arresters
Certain minor departures from the optional features can be accommodated. For example, the user may want copper bus instead of aluminum bus. Such deviations can be accommodated by a “minor modification.” Contact the nearest S&C Sales Office for availability.
APPLICATION NOTES: S&C Voltage Sensors, which provide power for Source- Transfer PMH models, are constant-current-output devices. For adequate power to be available, these models must be applied at system lineto-line voltages ranging from 11.43 kV through 17.0 kV for 14.4-kV models and from 20.44 kV through 29 kV for 25-kV models. For lower system voltages, contact the nearest S&C Sales Office.

2 S&C Specification Bulletin 663A-31 .

S&C Source-Transfer PMH Pad-Mounted Gear

For application information as well as a guide to the selection of appropriate ampere ratings and speeds of S&C SML Power Fuses and types and TCC curve parameters of control modules for Fault Fiter Electronic Power Fuses, contact the nearest S&C Sales Office.
Switching with Uni-Rupter Interrupters
Source-Transfer PMH Pad-Mounted Gear features fuses with Uni-Rupter Interrupters for single-pole live switching of single-phase or three-phase load circuits on distribution systems rated 14.4 kV or 25 kV.
Complete ratings and capabilities of S&C Power Fuses with Uni-Rupter Interrupters as applied in SourceTransfer PMH Pad-Mounted Gear are shown in Table 1. Uni-Rupter Interrupters are also capable of carrying and interrupting load currents up to and including the emergency-peak load capabilities of the associated SML power fuses.
In addition to the load-dropping capabilities shown, Uni-Rupter Interrupters are capable of interrupting transformer magnetizing currents associated with the applicable loads, as well as line-charging and cablecharging currents typical for distribution systems of these voltage ratings. The duty-cycle fault-closing capabilities shown for S&C Power Fuses with Uni-Rupter Interrupters represent the fault-closing capabilities of the fuse with a Uni- Rupter Interrupter when the fuse is closed with a purposeful thrust without hesitation. Following the specified number of such closings (two or three), Uni-Rupter Interrupters will remain operable and able to carry and interrupt rated current.

A Note on Single-Pole Switching
In single-pole switching of ungrounded-primary three-phase transformers or banks (or single-phase transformers connected line to line), circuit connections or parameters may, in some cases, produce excessive overvoltages. In particular, for the following applications above 22 kV, single-pole switching by any means– including a Uni-Rupter Interrupter–should be performed only under the conditions stated in italics:
Switching unloaded or lightly loaded delta-connected or ungrounded-primary wye-wye connected three-phase transformers or banks (or line-to-line connected single-phase transformers), rated 150 kVA or less three-phase, or 50 kVA or less single-phase– or of any kVA rating when combined with unloaded cables or lines–where maximum system operating voltage exceeds 22 kV (Single-pole switching should be performed only if each phase is carrying 5% load or more, or if the transformer or bank is temporarily grounded at the primary neutral during switching.)
Switching loaded or unloaded ungrounded-primary wye-delta connected three- phase transformers or banks–alone or combined with unloaded cables or lines–where maximum system operating voltage exceeds 22 kV (Single-pole switching should be performed only if each phase is carrying 5% load or more and if the lighting-load phase is always switched open first (or switched closed last); or if the transformer or bank is temporarily grounded at the primary neutral during switching.)

Table 1. Ratings and Capabilities for S&C Power Fuses With Uni-Rupter Interrupters

Voltage, kV

Fuse Type

Nom. Max BIL

Max

SML-20

14.4

17

95

25

27

125

200E or 200K 200E or 200K

SML-4Z

14.4

17

95

25

27

125

200E 200E

14.4

17

95

200

Fault Fiter fuse

25

27

125

200

Three-time duty-cycle fault-closing capability. Two-time duty-cycle fault- closing capability.

Current, Amperes, RMS

Live Switching

Interr. (Sym.)

Load Splitting (Parallel or Loop
Switching)

Load Dropping

Duty-Cycle FaultClosing RMS, Sym.

14 000

200

200

14 000

12 500

200

200

12 500

12 500

200

200

12 500

12 500

200

200

12 500

14 000

200

200

14 000

12 500

200

200

12 500

Applicable to solidly ground-neutral systems only, with fuses connected by single-conductor,concentric-neutral type cable to a transformer or transformers. Rating is 9,400 amperes, RMS symmetrical for all other applications.

. S&C Specification Bulletin 663A-31 3

S&C Source-Transfer PMH Pad-Mounted Gear

Recommended Voltage Ratings of CurrentLimiting Fuses for Use in S&C Pad- Mounted Gear
In general, current-limiting fuses should have a maximum voltage rating equal to, but not greater than, 140% of the system line-to-line voltage because for most applications, the fuses can be exposed to full system line-to-line voltage in clearing faults. Although there may be economic or space-saving incentives for using current-limiting fuses with voltage ratings “appropriate for system line-to-ground voltage” (i.e., fuses with a voltage rating lower than line-to-line voltage but greater than or equal to maximum system line-to- ground voltage), S&C recommends such use only in the following applications:
Protection of single-phase transformers serving single-phase loads
Protection of three-phase lateral circuits fed by single-conductor shielded cable (provided each transformer on that lateral is individually fused so the current-limiting fuse serving the lateral will not be required to clear secondary faults)
Protection of single-phase lateral circuits fed by single-conductor shielded cable where the load is line-to-ground connected
Switching with Mini-Rupter Switches
Source-Transfer PMH Pad-Mounted Gear features Mini-Rupter Switches for three- pole live switching of three-phase circuits.

Complete ratings for Mini-Rupter Switches as applied in Source-Transfer PMH Pad-Mounted Gear are shown in Table 2. In addition to the load-dropping ratings shown, Mini-Rupter Switches are capable of interrupting transformer magnetizing currents associated with the applicable loads, as well as line- charging and cablecharging currents typical for distribution systems of these voltage ratings.
For applications on systems rated higher than 7.2 kV and involving load current with high harmonic content (such as rectifier load currents), refer to the nearest S&C Sales Office. The two-time duty-cycle fault-closing ratings shown for Mini-Rupter Switches define the ability to close the Mini-Rupter Switch twice against a three-phase fault with asymmetrical current in at least one phase equal to the rated value, with the switch remaining operable and able to carry and interrupt rated current.
WARRANTY QUALIFICATIONS: The standard warranty contained in the seller’s standard conditions of sale (as set forth in Price Sheet 150) does not apply to Source-Transfer PMH Pad-Mounted Gear where fuse units, fuse unit end- fittings, holders, refill units, or switch blades of other than S&C manufacture are used in conjunction with S&C SML Mountings. Nor does it apply to Source-Transfer PMH Pad-Mounted Gear where other than Fault Fiter Electronic Power Fuses, S&C Switch Blades, or the current-limiting fuses listed in Table 1 of S&C Information Bulletin 660-50 are used in conjunction with Fault Fiter Electronic Power Fuse Mountings and S&C Holders designed therefor, or when current-limiting fuses are applied other than as set forth under the section “Recommended Voltage Ratings of Current-Limiting Fuses for Use in S&C Pad-Mounted Gear”.

Table 2. Ratings For S&C Mini-Rupter Switches

Voltage, kV

Live Switching

Nom. Max

14.4

17.5

25

29

BIL

Cont. Load Splitting

(Parallel

Load

or Loop

Dropping

Switching)

95

600

600

600

125

600

600

600

Current, Amperes
Three-Time Duty-Cycle, Fault-Closing

Peak

RMS, Sym.

36 400 32 500

14 000 12 500

Short-Circuit

Peak Withstand, Peak
36 400 32 500

One-Second ShortTIme Withstand, RMS, Sym.
14 000 12 500

4 S&C Specification Bulletin 663A-31 .

S&C Source-Transfer PMH Pad-Mounted Gear

How to Order
STEP 1. Three-Phase Units (Pad-Mounted Gear)
(a) Obtain the catalog number of the desired unit from Table 3 on page 6.
(b) Add suffix designations (to the catalog number above) to indicate the optional features desired, selected from Table 4 on pages 7 through 9.
(c) Obtain the catalog number of the connectors, accessories, touch-up kit components, and replacement voltage limiters from Table 14 and Table 15 on page 16, and Table 16 and Table 17 on page 17.

STEP 2.

Fuse Components and Switch Blades
For SML-20 Power Fuses: Obtain the catalog number of the end-fittings and the fuse units from Table 5 on page 10, making sure to match the voltage rating of the end fittings to the fuse units.
For SML-4Z Power Fuses: Obtain the catalog number of the holder and refill units from Table 6 on page 10, making sure to match the voltage rating of the holder to the refill units.
For Fault Fiter Electronic Power Fuses: Obtain the catalog number for the holders, the interrupting modules, and the control modules from Table 7 on page 10, making sure to match the voltage rating of the holders, interrupting modules, and the control modules.
For Switch Blades: Obtain the catalog number for the switch blades from Table 14 on page 16.

Example: The catalog number of a 14.4-kV sourcetransfer Model PMH-9 with SML-20 Mountings and equipped with stored-energy operators, S&C Micro-AT Source-Transfer Control, and S&C Voltage Sensors; optional cable guides for switches and fuses; and 10-kV metal-oxide surge arresters at all switch terminals is below.

5 6 2 5 2 R 2 ­M 2 M 3 N 7

. S&C Specification Bulletin 663A-31 5

S&C Source-Transfer PMH Pad-Mounted Gear

Table 3. Three-Phase Units (Including mountings with Uni-Rupter Interrupters–less fuse components)

Model

Connection Diagram

Fuse Type

kV Nom. Max BIL

Ratings

Amperes, RMS

Short-Circuit

Fuse with Uni-Rupter Interrupter
Load Max Drop-
ping

Mini-Rupter Switch
Load Cont. Drop-
ping

Amperes, RMS, Sym.

MVA, 3-Phase, Sym. at
Rated Voltage

Catalog Number

Net Wt., Lbs. (kg)

Page Reference for Dimen-
sional Information

PMH-6

14.4 17 95 200E 200 600 600 SML-20
25 27 125 200E 200 600 600

14 000 12 500

350 56222R2 2075 (941) 540 56223R1 2575 (1168)

14.4 17 95 200E 200 600 600 12 500

310 56422R2 2075 (941

SML-4Z

18

25 27 125 200E 200 600 600 12 500 540 56423R1 2575 (1168)

Fault 14.4 17 95 200 Fiter 25 29 125 200

200 600 600 200 600 600

14 000 12 500

350 56622R2 2075 (941) 540 56623R1 2575 (1168)

PMH-9

14.4 17 95 200E 200 600 600 SML-20
25 27 125 200E 200 600 600

14 000 12 500

350 56252R2 2150 (975) 540 56253R1 2650 (1202)

14.4 17 95 200E 200 600 600 12 500

310 56452R2 2150 (975)

SML-4Z

19

25 27 125 200E 200 600 600 12 500 540 56453R1 2650 (1202)

Fault 14.4 17 95 200 Fiter 25 29 125 200

200 600 600 200 600 600

14 000 12 500

350 56652R2 2150 (975) 540 56653R1 2650 (1202)

Fuse components are to be ordered separately. Refer to Table 5, Table 6, and Table 7 on page 10.
Compartment numbers appear in each corner of the connection diagram.
The short-circuit ratings expressed in amperes, RMS, asymmetrical are 1.6 times the symmetrical values listed. Fault-closing and/or momentary ratings of switches and bus, and fault-closing capabilities and interrupting ratings of fuses, equal or exceed these values. For complete live-switching (as well as momentary and one-second) ratings for MiniRupter Switches and complete live- switching capabilities of Uni-Rupter Interrupters as applied in S&C Source- Transfer PMH Pad-Mounted Gear, refer to the section “Application Notes” on page 2.

These models also accommodate selected current-limiting fuses in S&C Holders; refer to Table 1 of S&C Information Bulletin 660-50. Maximum voltage and maximum ampere ratings as listed in that table apply when current-limiting fuses are used. Consult appropriate current-limiting fuse manufacturer for complete fuse ratings.
Catalog number suffixes “-C5” and “-C6” are required for ultimate users other than electric utilities.
SMU-20® Fuse Units are available in ratings through 200K amperes as well as 200E amperes.
Applicable to solidly grounded-neutral systems only, with fuses connected by single-conductor, concentric-neutral-type cable to a transformer or transformers. Rating is 9,400 amperes RMS symmetrical (405 MVA) for all other applications.

6 S&C Specification Bulletin 663A-31 .

S&C Source-Transfer PMH Pad-Mounted Gear

Table 4. Optional Features

Item

Light gray outdoor finish instead of olive green Equipment green outdoor finish (Toronto standard) instead of olive green

Seafoam green outdoor finish instead of olive green

Special color to match custom Ultradur II Outdoor Finish

With olive green Ultradur II Outdoor Finish

Stainless steel enclosure

With light gray Ultradur II Outdoor Finish

With special color Outdoor Ultradur II Outdoor Finish

Hexhead actuator for use in lieu of pentahead actuator on all Penta-Latch Mechanisms

For use except when catalog number suffix “-F2” is specified
For use when catalog number suffix “-F2” is also specified

Key interlocks to prevent opening fuse-compartment doors unless all switches are locked open

Mechanical cable interlocks to prevent operation of switch when associated switch-compartment door is open

Mechanical antiparalleling to prevent paralleling two sources

Auxiliary switches, 4-PST, one coupled to each switch

Auxiliary switches, 4-PST, one coupled to each stored-energy operator

Remote-control receptacle for each stored-energy operator to permit open/close operations from an adjacent location using the remote-control station (not included; see Table 15 on page 16)

Mounting provisions for a fault indicator in each switch compartment
Note: Accommodates three-phase indicator with single-phase sensors

Without viewing window in door With viewing window in door

Inner barrier panels–a panel inside the enclosure door for each compartment, secured by recessed pentahead bolt(s)

Copper ground stud for each switch or fuse terminal and ground pad

In fuse compartments In switch compartments

Suffix to be Added to Pad-Mounted Gear Catalog Number

Applicable to Models

-A2

All models

-A3

All models

-A4

All models

-A5

All models

-A10

All models

-A12

All models

-A15

All models

-B1

All models

-B2 -C5 -C6 -C7 -C9 -C10 -C11 -F1

All models All models All models All models All models All models All models All models

-F2

All models

-G7 -H2 -J2

All models All models All models

When this optional feature is specified, the entire exterior of the enclosure is fabricated from 11-gauge Type 304 stainless steel. When specifying optional hexhead actuators, interlocks, antiparalleling, auxiliary switches, provisions for fault indicators with viewing windows in doors, or base spacer, specify the correct suffix for use in gear with a stainless steel enclosure.

When specifying, please furnish name of end user, station, and location of gear.

Meets Rural Utility Service’s requirements for “dead-front.”

Diameters of copper ground studs are as follows:

Ground Stud Diameter (inches)

Switch

1/2

Fuse

7/16

Ground Pad

7/16

When specifying catalog number suffix “-B1,” “-B2,” “-C5” through
“-C10,” or “-F2” for use in gear with a stainlessTAstBeeLl EenCclOosNurTeI,NinUcrEeaDse
the suffix designation by 10; for example, specify Suffix “-B11” instead of “-B1.”
Catalog number suffixes “-C5” and “-C6” are required for end users other than electric utilities.
Must be specified if end user is not an electric utility and/or Canadian Standards Association listing (catalog number suffix “-Z”) is specified.
Not available if Canadian Standards Association listing (catalog number suffix “-Z”) is specified.

TABLE CONTINUED

. S&C Specification Bulletin 663A-31 7

S&C Source-Transfer PMH Pad-Mounted Gear

Table 4. Optional Features–Continued

Item

Suffix to be Added to Pad-Mounted Gear Catalog Number

Applicable to Models

6 inches (15 cm)

-K1

All models

Carbon steel

12 inches (30 cm)

-K2

18 inches (46 cm)

-K3

All models All models

Base spacer, compartmented to match enclosure, increases cable-termination height

24 inches (61 cm) 6 inches (15 cm)

-K4 -K11

All models All models

Stainless steel

12 inches (30 cm) 18 inches (46 cm)

-K12 -K13

All models All models

24 inches (61 cm)

-K14

All models

6 inches (15 cm)

-K7

All models

Carbon steel

12 inches (30 cm)

-K8

18 inches (46 cm)

-K9

All models All models

Base spacer, noncompartmented, increases cable-termination height

24 inches (61 cm) 6 inches (15 cm)

-K10 -K17

All models All models

Stainless steel

12 inches (30 cm) 18 inches (46 cm)

-K18 -K19

All models All models

24 inches (61 cm)

-K20

All models

International crating

-L71

All models

Switch-terminal adapters–for connection of two cables (through 750 kc mil) per terminal Note: Space limitations prevent use of these adapters where surge arresters are to be installed

-M1

All models

Cable guides, one at each terminal

In switch compartments. For conductor sizes No. 2 through 1000 kc mil
In fuse compartments. For conductor sizes No. 2 through 4/0

-M2

All models

-M3

All models

9 kV

-N6

All models

Polymer-housed metal-oxide surge arresters, base-mounted, at all switch terminals (removed for shipment)

10 kV 12 kV 15 kV

-N7 -N8 -N9

All models All models All models

18 kV

-N10

All models

Mounting provisions for base-mounted surge arresters, at all switch terminals

9 kV, 10 kV, or 9/10 kV 12 kV 15 kV

-P1 -P3 -P4

All models All models All models

18 kV

-P5

All models

Wood products used in the packaging are either hardwood or certified by the wood supplier as being “heat treated (kiln dried) to a core temperature of 133°F (56°C) for a minimum of 30 minutes.”
When catalog number suffix “-M1” or “-M2” is specified, cable-termination options (catalog number suffixes “-U2” and “-U3”) cannot be accommodated. In addition, when catalog number suffixes “-M1” and “-M2” are both specified, only one cable guide is provided at each switch terminal.

These devices extend below the base of the unit. Provide a cable
pit or specify a base spacer that provides a 12T-AinBchLE(30C-cOmN) TorINgrUeaEtDer
increase in cable-termination height.
Surge arresters are base-mounted only (without isolators).
These provisions accommodate Ohio Brass Type PDV (metal oxide), Eaton Cooper Power Type AZL19C (metal oxide), or General Electric Tranquell® (metal oxide) distribution-class surge arresters. Surge arresters must be base-mounted only (without isolators).
Not applicable to 25-kV models.
Not applicable to 14.4-kV models.

TABLE CONTINUED

8 S&C Specification Bulletin 663A-31 .

S&C Source-Transfer PMH Pad-Mounted Gear

Table 4. Optional Features–Continued

Item

Suffix to be Added to Pad-Mounted Gear Catalog Number

Applicable to Models

Mounting provisions for porcelain cable terminators for single-conductor UD cable, at all switch terminals

Joslyn PSC for No. 6 through 2/0, or G&W PAT for No. 4 through 250 kc mil copper or aluminum cable
G&W PAT for 3/0 through 750 kc mil copper or 500 kc mil aluminum cable

Overcurrent lockout. Prevents an automatic source transfer that would close a switch into a fault. Includes field adjustable lockout level and lockout-reset time delay, lockout-indicating lamp, manual-reset key, facilities for external reset, and six current sensors (one per phase for each switch)

Remote indication. Includes provisions for remote monitoring of presence or absence of source voltages, manual or automatic operating mode, and status of “ready” indicator, “event” indicator, and overcurrent lockout (if furnished)

Test panel. Permits the use of an external, adjustable three-phase source to verify, through independent measurement, the response of the control to loss- of-source, phase-unbalance, and overcurrent-lockout (if furnished) conditions

Supervisory control. Permits switch operation from a remote location

Communications card. Permits local uploading of “events” and settings from the Micro-AT control to a user-furnished personal computer, as well as down- loading of the user’s standard operating parameters

Canadian Standards Association listing. Includes viewing window with tamper- resistant cover in switch compartment door(s), and hazard-alerting labels and nameplate per CSA specification

-U2 -U3 -Y2
-Y4
-Y5 -Y6 -Y8 -Z

All models All models All models
All models
All models All models All models PMH-6, -9

Additional current sensors and wiring harnesses are required for use with the switch-terminal adapter option (catalog number suffix “-M1”) which permits two cables per terminal. For such applications, contact the nearest S&C Sales Office.
For applications where pad-mounted gear load feeders are connected to transformers with wye-grounded primary windings, contact the nearest S&C Sales Office.
S&C Closed-Gap Current Sensors, catalog number TA-1758, are furnished. Each current sensor accommodates a single conductor up to 21/2 inches (63.5 mm) in diameter.
Current sensors must not be installed on unshielded cables or on cables where the insulation is exposed but ungrounded (for example, where dielectric tape or heat-shrink tubing is used). These sensors are intended for application at ground potential and may be damaged by the voltage gradient between the cable insulation and ground.
Includes a terminal block for user’s connections.

If a three-phase test source is not available, limited testing may be performed using an external, adjustable single-phase source.
In instances where a three-phase test source is to be used, an S&C Voltage Limiter–Three-Phase catalog number TA-1741 must be furnished for the test circuit.
Requires Micro-AT communication cable catalog number TA-2320 or TA-2321. See Table 15 on page 16.
These devices extend below the base of the unit. Provide a cable pit or specify a base spacer.
Key interlocks (catalog number suffix “-C3” or “-C4”) must be specified on gear with fuse compartment(s).
Not available if mounting provisions for fault indicator with viewing window in switch compartment door(s) (catalog number suffix “-F2” or “-F12”) is specified.
Not available if inner barrier panels (catalog number suffix “-G7”) is specified.

. S&C Specification Bulletin 663A-31 9

S&C Source-Transfer PMH Pad-Mounted Gear

Table 5. SML-20 Power Fuse Components

Fuse-Unit End Fittings

Item

Catalog Number

End-fittings (including silencer), for use with SMU-20 Fuse Units

3097

SMU-20® Fuse Units

14.4 kV Nominal, 17.0 kV Max

25 kV Nominal, 27 kV Max

For a complete listing of available ampere ratings, speeds, and catalog numbers, refer to Table 8 on page 11 and Table 9 on page 12.

These fuse units are usable in SM-20, SMD-20, SML-20, and SME-20 Mountings.

Table 6. SML-4Z Power Fuse Components

Holders

Rating

Item

kV

Nom.

Max

Amperes, Max

Catalog Number

Holder (including silencer), for use with SM-4 Refill Units

14.4

17

200E

25

27

200E

92352 92353

SM-4® Refill Units

14.4 kV Nominal, 17.0 kV Max

25 kV Nominal, 27 kV Max

For a complete listing of available ampere ratings, speeds, and catalog numbers, refer to Table 10 on page 13.

These fuse units are usable in SM-4, SM-4Z, SML-4Z, and SME-4Z holders.

Table 7. Fault Fiter Electronic Power Fuse Components
Holders Item
Holder, for use with Fault Fiter Electronic Power Fuses Interrupting Modules
Item
Interrupting module, for use with Fault Fiter Electronic Power Fuses Control Modules

Nom. 13.8 25

Rating kV
Max 17 29

Amperes, Cont.
400 200

Nom. 13.8 25

Rating kV
Max 17 29

Amperes, Cont.
600 600

Catalog Number 99412R1 99413R1
Catalog Number 802600R2 803600R2

For a complete listing of available types, TCC curve parameters, and catalog numbers, refer to Table 11 and Table 12 on page 14, and Table 13 on page 15.
Interrupting modules and control modules rated 600 amperes continuous are also applicable for use in mountings rated 200 or 400 amperes continuous.

10 S&C Specification Bulletin 663A-31 .

S&C Source-Transfer PMH Pad-Mounted Gear

Table 8. SMU-20® Fuse Units (For use in SM-20 or SML-20 Mountings)

“K” Ratings

14.4 kV Nominal, 17.0 kV Max “E” Ratings

Rating, Amperes

Catalog Number

Rating, Amperes

Catalog Number

Speed

S&C “K” TCC 165-2

Speed 1E

Speed

3K

702003

6K

702006

5E

8K

702008

7E

10K

702010

10E

12K

702012

13E

15K 20K 25K 30K 40K 50K 65K 80K 100K 140K 200K

702015 702020 702025 702030 702040 702050 702065 702080 702100 702140 702200

15E 20E 25E 30E 40E 50E 65E 80E 100E 125E 150E 175E 200E

These fuse units are equally suitable for use in SMD-20 outdoor distribution mountings and for use with SME-20 Fuse Unit end-fittings listed in Specification Bulletin 665-31, “S&C Manual PME Pad-Mounted Gear” and Specification Bulletin 666-31, “S&C Remote Supervisory PME Pad-Mounted Gear.”

S&C Std. TCC 115-2
702001 S&C Std. TCC 153-2
612005 612007 612010 612013 612015 612020 612025 612030 612040 612050 612065 612080 612100 612125 612150 612175 612200

S&C Slow TCC 119-2
712015 712020 712025 712030 712040 712050 712065 712080 712100 712125 712150 712175 712200

S&C Very Slow TCC 176-2
602050 602065 602080 602100 602125 602150 602175 602200

. S&C Specification Bulletin 663A-31 11

S&C Source-Transfer PMH Pad-Mounted Gear

Table 9. SMU-20® Fuse Units (For use in SM-20 or SML-20 Mountings)

“K” Ratings

25 kV Nominal, 27 kV Max

“E” Ratings

Rating, Amperes

Catalog Number

Rating, Amperes

Catalog Number

Speed

S&C “K” TCC 165-2

Speed 1E

Speed

3K

703003

6K

703006

5E

8K

703008

7E

10K

703010

10E

12K

703012

13E

15K 20K 25K 30K 40K 50K 65K 80K 100K 140K 200K

703015 703020 703025 703030 703040 703050 703065 703080 703100 703140 703200

15E 20E 25E 30E 40E 50E 65E 80E 100E 125E 150E 175E 200E

These fuse units are equally suitable for use in SMD-20 outdoor distribution mountings and for use with SME-20 Fuse Unit end-fittings listed in Specification Bulletin 665-31, “S&C Manual PME Pad-Mounted Gear” and Specification Bulletin 666-31, “S&C Remote Supervisory PME Pad-Mounted Gear.”

S&C Std. TCC 115-2
703001
S&C Std. TCC 153-2

S&C Slow TCC 119-2

S&C Very Slow TCC 176-2

613005 613007 613010 613013

613015 613020 613025 613030 613040 613050 613065 613080 613100 613125 613150 613175 613200

713015 713020 713025 713030 713040 713050 713065 713080 713100 713125 713150 713175 713200

603050 603065 603080 603100 603125 603150 603175 603200

Also suitable for protection of single-phase-to-neutral circuits (lines or transformers) on 20/34.5 GrY-kV systems.

12 S&C Specification Bulletin 663A-31 .

S&C Source-Transfer PMH Pad-Mounted Gear

Table 10. SM-4® Refill Units (For use in SM-4 and SML-4 Holders)

Rating, Amperes Speed

S&C Std. TCC 115-4

14.4 kV Nominal, 17.0 kV Max Catalog Number

25 kV Nominal, 27 kV Max
Catalog Number
S&C Std. TCC 115-4

1E 2E
Speed
3E 5E 7E 10E 13E 15E 20E 25E 30E 40E

122001R4 122002R4 S&C Std. TCC 153-4 122005R4 122007R4 122010R4 122015R4 122020R4 122025R4 122030R4 122040R4 122050R4 122060R4

S&C Slow TCC 119-4
252025R4 252030R4 252040R4 252050R4 252060R4

S&C Coord. TCC 179-4

123001R4 123002R4 S&C Std. TCC 153-4 123005R4 123007R4 123010R4 123015R4 123020R4 123025R4 123030R4 123040R4 123050R4 123060R4

S&C Slow TCC 119-4
253025R4 253030R4 253040R4 253050R4 253060R4

50E 65E 80E 100E 125E 150E 175E 200E

122075R4 122100R4 122125R4 122150R4 122200R4 122250R4 122275R4 122300R4

252075R4 252100R4 252125R4 252150R4 252200R4 252250R4 252275R4 252300R4

123075R4 123100R4 123125R4 123150R4 123200R4 123250R4 123275R4 123300R4

253075R4 253100R4 253125R4 253150R4 253200R4 253250R4 253275R4 253300R4

210E

382210R4

These refill units are also suitable for use with SME-4Z Holders listed in Specification Bulletin 665-31, “S&C Manual PME Pad-Mounted Gear” and Specification Bulletin 666-31, “S&C Remote Supervisory PME Pad-Mounted Gear.”
Rated 14.4 kV nominal, for use in SM-4 Holders rated 14.4 kV when applied in listed mountings rated 13.8 kV or in discontinued mountings rated 14.4 kV.

This S&C Coordinating Speed refill unit should be applied where the maximum continuous load current does not exceed 200 amperes and where all fault currents below 1000 amperes will be cleared by another fuse.

. S&C Specification Bulletin 663A-31 13

S&C Source-Transfer PMH Pad-Mounted Gear

Table 11. Fault Fiter Control Modules–Underground Subloop Type (TCC No. 422-7)

Continuous Current, Amperes, Max
600

Minimum Pickup, Amperes, RMS
400 500

TCC Curve Parameters

Short-Time Pickup, Amperes, RMS

Short-Time Delay Band

1300

2

1300

1

Instantaneous Pickup,
Amperes, RMS
3000
3000

Catalog Number
7020-C40P130S2T3 7020-C50P130S1T3

This control module is applicable for protection of 15-kV and 25-kV class underground distribution subloops having the following parameters: maximum available fault current–14,000 amperes, RMS, symmetrical at 15 kV, 12,500 amperes, RMS, symmetrical at 25 kV; maximum rated transformer kVA connected for residential circuits– 1200 kVA single-phase, 3600 kVA three-phase at 15 kV, 2400 kVA single-phase, 7200 kVA three-phase at 25 kV; with no capacitor banks or current-limiting fuses on the load side of the Fault Fiter fuse. If the

maximum rated transformer kVA connected is greater than the values listed above, or if the application involves protection of circuits serving industrial, commercial, or institutional loads, contact the nearest S&C Sales Office.
Control modules rated 600 amperes continuous are also applicable for use in mountings rated 200 amperes or 400 amperes continuous.

Table 12. Fault Fiter Control Modules–Inverse Curve Type (TCC No. 410-7)

Continuous Current, Amperes, Max

Minimum Pickup, Amperes, RMS

400 500 600 700 600 800 1000 1250 1500

Control modules rated 600 amperes continuous are also applicable for use in mountings rated 200 amperes or 400 amperes continuous.

Catalog Number
814040 814050 814060 814070 814080 814100 814125 814150

14 S&C Specification Bulletin 663A-31 .

S&C Source-Transfer PMH Pad-Mounted Gear

Table 13. Fault Fiter Control Modules–Time-Delayed Compound-Curve Type (TCC No. 421-7)

Continuous Current, Amperes, Max

Minimum Pickup, Amperes, RMS

TCC Curve Parameters

Short-Time Delay Band

High-Current Pickup,
Amperes, RMS

3000 1
6000

3000 2
6000 400
3000 3
6000

3000 4
6000

3000 1
6000

3000 2
6000 600
3000 3
6000

3000 4
6000 600
3000 1
6000

3000 2
6000 800
3000 3
6000

3000 4
6000

3000 1
6000

1100

3000 2
6000 3000 3 6000

3000 4
6000

Control modules rated 600 amperes continuous are also applicable for use in mountings rated 200 amperes or 400 amperes continuous.

High-Current Delay Band
Time Delay, ms 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8

Catalog Number
7010-C40S1T3D8 7010-C40S1T6D8 7010-C40S2T3D8 7010-C40S2T6D8 7010-C40S3T3D8 7010-C40S3T6D8 7010-C40S4T3D8 7010-C40S4T6D8 7010-C60S1T3D8 7010-C60S1T6D8 7010-C60S2T3D8 7010-C60S2T6D8 7010-C60S3T3D8 7010-C60S3T6D8 7010-C60S4T3D8 7010-C60S4T6D8 7010-C80S1T3D8 7010-C80S1T6D8 7010-C80S2T3D8 7010-C80S2T6D8 7010-C80S3T3D8 7010-C80S3T6D8 7010-C80S4T3D8 7010-C80S4T6D8 7010-C110S1T3D8 7010-C110S1T6D8 7010-C110S2T3D8 7010-C110S2T6D8 7010-C110S3T3D8 7010-C110S3T6D8 7010-C110S4T3D8 7010-C110S4T6D8

. S&C Specification Bulletin 663A-31 15

S&C Source-Transfer PMH Pad-Mounted Gear

Table 14. Switch Blades

Item

Nom.

Switch blade, for use in lieu of SMU-20 Fuse Unit in

14.4

SML-20 Mounting

25

Switch blade, for use in lieu of SML-4Z Holder in

14.4

SML-4 Mounting

25

Switch blade, for use in lieu of Fault Fiter fuse

14.4

holder in Fault Fiter fuse mounting

25

When switch blades are used in lieu of fuses, the Uni-Rupter Interrupter associated with these switches can carry and interrupt load currents up to and including the emergency peak-load capabilities of the SML power fuses, or up to 400 amperes at 14.4 kV and 200 amperes at 25 kV for Fault Fiter Electronic Power Fuses. Furthermore, the

Rating kV
Max

Amperes, Cont.

Catalog Number

17

200

5432

27

200

5433

17

200

5442

27

200

5443

17

400

3222

29

200

3223R1

switches with Uni-Rupter Interrupters have fault-closing ratings equal to those of S&C Power Fuses with Uni-Rupter Interrupters (refer to the section “Application Notes” on page 2). The momentary and one-second ratings of the switches equal the short-circuit ratings of the pad-mounted gear.

Table 15. Accessories

Item

Catalog Number

S&C test accessory, permits preliminary checkout of source-transfer control using single-phase 120-volt ac source (before medium-voltage connections are made to the pad-mounted gear) to expedite full service once medium voltage is available. The test accessory isolates the S&C Voltage Sensor during testing and eliminates the possibility of backfeed during test procedures

TA-2669

Portable remote-control station with 50-foot cord, connects to one remote- control receptacle (not included; see optional feature “-C11” on page 7) to permit open/close operations from an adjacent location

5294

Micro-AT communication cable. For connecting optional communications card to user-furnished personal computer. Includes MatlinkTM communication software

For personal computers having 25-pin serial communication port
For personal computers having 9-pin serial communication port

TA-2320 TA-2321

Grounding jumpers, set of three, with eye-type clamps for installation with a standard shotgun clamp stick

3-foot (91-cm) cable length

4210

Shotgun clamp sticks for installation of grounding jumpers and for use with voltage testers

6-foot 51/2-inch (198-cm) length 8-foot 51/2-inch (258-cm) length

9933-150 9933-151

For grounding jumpers

9933-149

Storage Bag, heavy canvas

For shotgun clamp stick

6-foot 6-inch (197-cm) length
8-foot 6-inch (259-cm) length

9933-152 9933-153

Voltage Tester with audio and visual signals, includes voltage tester, batteries, adapter for shotgun clamp sticks, and storage case

9931-072

Pentahead socket, for 1/2-inch drive

9931-074

Required with source-transfer PMH Pad-Mounted Gear furnished with optional test panel feature (catalog number suffix “-Y5”), if the source-transfer control is to be tested with the switchgear de-energized.
For end users other than electric utilities, also specify a shotgun clamp stick of the appropriate length.

Catalog number TA-2669 is for use with Micro-AT controls only. Contact the S&C Sales Office for test accessories compatible with Type AT controls.

16 S&C Specification Bulletin 663A-31 .

S&C Source-Transfer PMH Pad-Mounted Gear

Table 16. Touch-Up Kit Components–Aerosol Coatings in 12-Ounce Cans

S&C light gray outdoor finish S&C olive green (Munsell 7GY3.29/1.5) outdoor finish S&C red-oxide primer

Item

Table 17. Replacement Voltage Limiters
Item
Replacement voltage-limiter kit–for pad-mounted gear applications where the existing voltage limiters are installed in the low-voltage compartment. Consists of one catalog number TA-2003 Voltage Limiter–Three Phase, two jumpers, and an installation instruction drawing
Replacement voltage-limiter kit–for pad-mounted gear applications where the existing voltage limiters are installed in the medium-voltage compartments. Consists of two catalog number TA-2003 Voltage Limiters–Three-Phase, two mounting brackets with hardware, two wiring harnesses, and an installation instruction drawing
For use with S&C Indoor Voltage Sensors having 20-Volt-ampere or 27.5-Volt- ampere output rating.

Table 18. Connector
Illustration

Description

Accommodating Connector

Catalog Number 9999-080 9999-058 9999-061
Catalog Number TA-2007-1 TA-2007-2
Catalog Number

Bronze body, tin plated, two galvanized steel bolts, two Belleville washers

No. 2 solid (33.6 mm2) through 500 kc mil (335 mm2) stranded copper or aluminum

4745

. S&C Specification Bulletin 663A-31 17

S&C Source-Transfer PMH Pad-Mounted Gear

Model PMH-6

Dimensions in inches (mm)

1 (35)
FOUR 5/8 (16) DIA. ANCHOR BOLTS–BY USER
1½ (38) MIN.

1

10¼

(35)

(260)

2 (51)

2¾ (70)

2¾ (70)

kV, Nominal A1

A2

B

C

D

E

F

G

H

J

K

L

M1

M2

R

S

T

W

14.4

97/8 7 51/8 501/2 633/4 127/8 603/4 6

44 43/4 93/4 143/4 281/2 345/8 451/4 73/4 21/4 67

(251) (178) (130) (1283) (1619) (327) (1543) (152) (1118) (121) (248) (375) (724) (879) (1149) (197) (57) (1702)

25

141/8 111/4 71/8 621/2 793/4 133/4 763/4 71/2 55

6 121/2 161/2 321/8 421/8 521/2 121/8 21/4 82

(359) (286) (181) (1588) (2026) (349) (1949) (191) (1397) (152) (318) (419) (816) (1070) (1334) (308) (57) (2083)

When catalog number suffix “-M1,” “-U2,” or “-U3” is specified, cabletermination locations will be slightly affected. Consult the nearest S&C Sales Office for details.

18 S&C Specification Bulletin 663A-31 .

Model PMH-9

S&C Source-Transfer PMH Pad-Mounted Gear
Dimensions in inches (mm)

1 (35)
FOUR 5/8 (16) DIA. ANCHOR BOLTS–BY USER
1½ (38) MIN.

1

10¼

(35)

(260)

2 (51)

2¾ (70)

2¾ (70)

kV, Nominal A1

A2

B

C

D

E

F

G

H

J

K

L

M1

M2

R

S

T

W

14.4

97/8 7 51/8 501/2 633/4 127/8 603/4 6

44 43/4 93/4 143/4 281/2 345/8 451/4 73/4 21/4 67

(251) (178) (130) (1283) (1619) (327) (1543) (152) (1118) (121) (248) (375) (724) (879) (1149) (197) (57) (1702)

25

141/8 111/4 71/8 621/2 793/4 133/4 763/4 71/2 55

6 121/2 161/2 321/8 421/8 521/2 121/8 21/4 82

(359) (286) (181) (1588) (2026) (349) (1949) (191) (1397) (152) (318) (419) (816) (1070) (1334) (308) (57) (2083)

When catalog number suffix “-M1,” “-U2,” or “-U3” is specified, cabletermination locations will be slightly affected. Consult the nearest S&C Sales Office for details.

. S&C Specification Bulletin 663A-31 19

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