S C MS-2 Switch Metal Enclosed Switchgear Instruction Manual

Instructions for Operation
Type MS-2 Switch Operators

Introduction

Qualified Persons

WARNING
Only qualified persons who are knowledgeable in the installation, operation, and maintenance of overhead and underground electric distribution equipment, along with all associated hazards, may install, operate, and maintain the equipment covered by this publication . A qualified person is someone who is trained and competent in:

• The skills and techniques necessary to distinguish exposed live parts from nonlive parts of electrical equipment
• The skills and techniques necessary to determine the proper approach distances corresponding to the voltages to which the qualified person will be exposed
• The proper use of special precautionary techniques, personal protective equipment, insulated and shielding materials, and insulated tools for working on or near exposed energized parts of electrical equipment

These instructions are intended ONLY for such qualified persons . They are not intended to be a substitute for adequate training and experience in safety procedures for this type of equipment .
Read this Instruction Sheet
NOTICE
Thoroughly and carefully read this instruction sheet and all materials included in the product’s S&C Instruction Handbook before installing or operating your Type MS-2 Switch Operator . Familiarize yourself with the Safety Information and Safety Precautions on pages 4 and 5 . The latest version of this publication is available online in PDF format at sandc.com/en/support/product-literature/ .
Retain this Instruction Sheet
This instruction sheet is a permanent part of the Type MS-2 Switch Operator. Designate a location where you can easily retrieve and refer to this publication.
Proper Application
WARNING
The equipment in this publication is only intended for a specific application . The application must be within the ratings furnished for the equipment .
Warranty
The warranty and/or obligations described in S&C’s Price Sheet 150, “Standard Conditions of Sale–Immediate Purchasers in the United States” (or Price Sheet 153, “Standard Conditions of Sale–Immediate Purchasers Outside the United States”), plus any special warranty provisions, as set forth in the applicable product-line specification bulletin, are exclusive. The remedies provided in the former for breach of these warranties shall constitute the immediate purchaser’s or end user’s exclusive remedy and a fulfillment of the seller’s entire liability. In no event shall the seller’s liability to the immediate purchaser or end user exceed the price of the specific product that gives rise to the immediate purchaser’s or end user’s claim. All other warranties, whether express or implied or arising by operation of law, course of dealing, usage of trade or otherwise, are excluded. The only warranties are those stated in Price Sheet 150 (or Price Sheet 153), and THERE ARE NO EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. ANY EXPRESS WARRANTY OR OTHER OBLIGATION PROVIDED IN PRICE SHEET 150 (OR PRICE SHEET 153) IS GRANTED ONLY TO THE IMMEDIATE PURCHASER AND END USER, AS DEFINED THEREIN. OTHER THAN AN END USER, NO REMOTE PURCHASER MAY RELY ON ANY AFFIRMATION OF FACT OR PROMISE THAT RELATES TO THE GOODS DESCRIBED HEREIN, ANY DESCRIPTION THAT RELATES TO THE GOODS, OR ANY REMEDIAL PROMISE INCLUDED IN PRICE SHEET 150 (or PRICE SHEET 153.)

Safety Information

Understanding Safety-Alert Messages
Several types of safety-alert messages may appear throughout this instruction sheet and on labels and tags attached to the Type MS-2 Switch Operator. Familiarize yourself with these types of messages and the importance of these various signal words:
DANGER
“DANGER” identifies the most serious and immediate hazards that will likely result in serious personal injury or death if instructions, including recommended precautions, are not followed .
WARNING
“WARNING” identifies hazards or unsafe practices that can result in serious personal injury or death if instructions, including recommended precautions, are not followed .
CAUTION
“CAUTION” identifies hazards or unsafe practices that can result in minor personal injury if instructions, including recommended precautions, are not followed .
NOTICE
“NOTICE” identifies important procedures or requirements that can result in product or property damage if instructions are not followed .
Following Safety Instructions
If you do not understand any portion of this instruction sheet and need assistance, contact your nearest S&C Sales Offi ce or S&C Authorized Distributor. Their telephone numbers are listed on S&C’s website sandc.com, or call the S&C Global Support and Monitoring Center at 1-888-762-1100.

NOTICE

Read this instruction sheet thoroughly and carefully before installing the Type MS-2 Switch Operator .|

Replacement Instructions and Labels
If additional copies of this instruction sheet are needed, contact your nearest S&C Sales Offi ce, S&C Authorized Distributor, S&C Headquarters, or S&C Electric Canada Ltd.
It is important that any missing, damaged, or faded labels on the equipment be replaced immediately. Replacement labels are available by contacting your nearest S&C Sales Office, S&C Authorized Distributor, S&C Headquarters, or S&C Electric Canada Ltd.

Safety Precautions

DANGER

| Type MS-2 Switch Operators operate high-voltage switches . Failure to observe the precautions below will result in serious personal injury or death .
Some of these precautions may differ from company operating procedures and rules .
Where a discrepancy exists, follow your company’s operating procedures and rules .

1. QUALIFIED PERSONS. Access to MS-2 Switch Operators must be restricted only to qualified persons . See the “Qualified Persons” section on page 2 .

2. SAFETY PROCEDURES. Always follow safe operating procedures and rules .

3. PERSONAL PROTECTIVE EQUIPMENT. Always use suitable protective equipment, such as rubber gloves, rubber mats, hard hats, safety glasses, and flash clothing, in accordance with safe operating procedures and rules .

4. SAFETY LABELS. Do not remove or obscure any of the “DANGER,” “WARNING,” “CAUTION,” or “NOTICE” labels .

5. HIGH-VOLTAGE ISOLATION. Switch operators and controls are isolated from high voltage in grounded, metal-enclosed compartments . Access to these components is controlled by padlockable covers, which incorporate a nonrernovable manual handle . Other low-voltage components, such as meters, selector switches, toggle switches, etc ., are similarly isolated .

6. TEST FOR VOLTAGE. Test for voltage using proper high-voltage test equipment before touching any device to be inspected, serviced, or repaired in the high-voltage compartments .

7. ENERGIZED COMPONENTS. Always consider all parts live until de-energized, tested, and grounded . Voltage levels can be as high as the peak line-to-ground voltage last applied to the unit .
   Units energized or installed near energized lines should be considered live until tested and grounded .

8. GROUNDING. The MS-2 Switch Operators must be connected to a suitable earth ground, or to a suitable building ground for testing, before energizing the switchgear, and at all times when energized .
   The ground wire(s) must be bonded to the system neutral, if present . If the system neutral is not present, proper precautions must be taken to ensure the local earth ground, or building ground, cannot be severed or removed .

9. MAINTAINING PROPER CLEARANCE. Always maintain proper clearance from energized components .

10. GROUNDING EQUIPMENT. Install suitable grounding equipment before touching any device to be inspected, serviced, or repaired in the high-voltage compartments .

11. PADLOCKS. Non-removable, manual handles in high-voltage compartment doors and hingedpadlockable covers, as well as hinged-bolted panels, have provisions for padlocks which must be in place and secured at all times unless work is being performed inside the enclosure . Padlocks must be installed and secured on manual switch operating handles at all times unless the switch is being operated .

12. KEY INTERLOCKS. Key interlocks (if applicable) must be in place . Check the operating sequence of key interlocks to verify proper sequencing . After the switchgear is installed, destroy all duplicate keys or make them accessible only to authorized persons so the key interlock scheme will not be compromised . Key interlocks are not security locks .

13. MECHANICAL CABLE INTERLOCKS. The mechanical cable interlocks are provided to prevent access to fuses unless the switch is open and to prevent operation of stored-energy switch operators when the enclosure door is open . Do not attempt to operate any switch when the enclosure door is open . Periodically, verify these interlocks are functional .

Operation

General
These instructions are for Type MS-2 Switch Operators, catalog numbers 38744 and 38754, equipped with OPEN/ CLOSE pushbuttons for local manual electrical tripping of the quick-make quick-break stored-energy mechanism.
Refer to S&C Instruction Sheet 855-511 for instructions about superseded Type MS-2 Switch Operators, catalog numbers 38753 and 38763, equipped with a manual-trip lever, for local manual nonelectrical tripping of the quickmake quick-break stored-energy mechanism.
Type-MS-2 Switch Operators provide high-speed power operation of Switch- Operator-Driven Style Mini-Rupter® Switches (and Mini-Rupter Switches with Power Fuses) in metal-enclosed switchgear applications.
The operators in combination with the interrupter switches can be applied for high-speed source transfer for critical loads, circuit interruption for open- phase detection schemes, and live switching in response to supervisory control.
When used in conjunction with automatic control schemes, a Mini-Rupter Switch, driven by a Type MS-2 Switch Operator, can close or interrupt the circuit in four cycles; while two Mini-Rupter Switches, each driven by a Type MS-2 Switch Operator, accomplish source transfer in 10 cycles—excluding any intentional time delay.
The Type MS-2 Switch Operator incorporates a quickmake quick-break stored- energy mechanism which, when solenoid-tripped in response to a control signal (or manually tripped), opens and closes the Mini-Rupter Switch swiftly and positively—contributing to the Mini-Rupter Switch’s ability to achieve fast circuit interruption and two-time duty-cycle fault-closing ratings.
Motor charging of the switch operator’s quick-make quick-break mechanism is automatic after each opening or closing operation and is accomplished in 1½ seconds. If control power is lost, the mechanism can be manually charged by means of the removable utility crank, which is stored on the faceplate of the switch operator.
Refer to Table 1 for applicable catalog numbers.
Table 1. Switch Operators—Type MS-2—For Switch-Operator-Driven Style Mini- Rupter Switches (and Mini-Rupter Switches with Power Fuses)

Type| Style| Control Voltage| Switch Operator Catalog Number| Schematic Wiring
Diagram Drawing
Number
---|---|---|---|---
With mechanical cable interlock to prevent opening door when switch is closed and prevent closing switch when door is open①| With mechanical cable interlock
to prevent switch operation when
door is open②
MS-2| Motor-charge, automatic trip-open and trip-closed| 48 Vdc 115 Vac, 60 Hz| 38754-A
38754-D| 38744-A
38744-D| CDR-3166
CDR-3166

1. Typically used in conjunction with feeder-bay switch applications .
2. Typically used in conjunction with entrance-bay switch applications .

Type MS-2 Switch Operators, in combination with switch-operator-driven Mini- Rupter Switches, are suited for use with:

• Micro-AT® Source-Transfer Control to provide for automatic source transfer of common-bus primaryselective systems

• Type AT-2 Source-Transfer Control for two-way transfer in common-bus primary-selective systems

• Type AT-3 Source-Transfer Control for two-way transfer with bus-tie switch in split-bus primary-selective systems

• Other control schemes (e.g., for open-phase detection or remote supervisory control) where automatic Trip Open and Trip Closed operation, plus automatic charging after each operation, is desired
  Type MS-2 Switch Operators, as applied in Metal- Enclosed Switchgear, include the following features as standard:

• A factory-adjusted quick-make quick-break storedenergy mechanism, which closes and opens the Mini-Rupter Switch swiftly and positively, is automatically charged after each operation

• OPEN/CLOSE pushbuttons for local manual electrical tripping of the quick-make quick-break stored-energy mechanism—to open or close the Mini-Rupter Switch

• A utility crank, stored on the faceplate of the switch operator, for local manual nonelectrical tripping of the quick-make quick-break stored-energy mechanism, as well as for manual charging of the quick-make quickbreak stored-energy mechanism (Manual operation is only required when control power is lost.)

• Switch-operator targets that show whether the quickmake quick-break mechanism is charged or discharged and whether the switch operator is in the Switch Open or Switch Closed position

• A switch-position target that indicates whether the Mini-Rupter Switch is open or closed

• An operation counter

• A decoupling mechanism that mechanically locks the Mini-Rupter Switch open or closed, depending on the switch position at the time of decoupling (The switch operator, while decoupled, can be operated either electronically or manually without affecting the position of the Mini-Rupter Switch.)

• A decoupling indicator lever that indicates Coupled and Decoupled positions of the switch operator (Positive stops are incorporated to lock the switch operator in the Coupled and Decoupled posit ion.)

• An auxiliary switch that provides contacts, wired to a convenient connector receptacle, for external supervisory control circuits to indicate whether operator is in Switch Open or Switch Closed position

• A grounded steel-enclosed low-voltage compartment that isolates the switch operator from high voltage

• Quick-disconnect connector(s) for control wiring that simplify removal and reinsertion of the switch operator

• Choice of mechanical cable interlocks, either: (a) to prevent opening the switch-compartment door when the switch is closed and prevent closing the switch when the door is open; or (b) to prevent switch operation when the door is open

Switch-operator catalog numbers are suffixed with one or more letters. The first letter following the catalog number designates the motor and control voltage:

Suffix
-A
-D| Voltage
48 Vdc
115 V, 60 Hz
---|---

See Table 2 for other suffixes that may be added to the switch operator catalog number to indicate the inclusion of optional accessories.
Table 2. Options—For Type MS-2 Switch Operators

Item| Suffix Added to
Switch Operator
Catalog Number
---|---
Extra auxiliary switch, 4-PDT, coupled to switch operator| -Q
Extra auxiliary switch, 6-PDT, coupled to interrupter switch to monitor switch position①| -W
Remote-control receptacle—for use with the portable remote-control station catalog number 5294 (not included)| -F

1. If a key interlock for an MS-2 Switch Operator is furnished to prevent electrical paralleling of two sources, four (of six) auxiliary switch contacts are available for customer use .

NOTICE
Do not operate the Mini-Rupter Switch unless the associated enclosure door is closed and latched . A mechanical cable interlock between the Mini-Rupter Switch and its compartment door prevents switch operation when the door is open (or unlatched) .
Therefore, tripping of the associated switch operator under this condition will cause its mechanism to stall .
If a mechanical anti-paralleling device is used between two Mini-Rupter Switches in adjacent compartments (or if key interlocks are used for anti- paralleling), tripping of the switch operator in an attempt to close the open switch while the other switch is closed will cause the switch-operator mechanism to stall .
Do not assume the switch-operator position necessarily indicates the Open or Closed position of the Mini-Rupter Switch . At completion of an Open or Close operation, check to be sure the following conditions exist:

• The Switch-Operator Target signals “Operator in Switch Open Position” or “Operator in Switch Closed Position” to indicate the switch operator has moved through a complete operation . See Figure 1 on page 8 . Also note the position-indicating lamps at the supervisory-control location (if applicable) .
• The Mini-Rupter Switch Target should signal “Switch Open” or “Switch Closed,” in agreement with the Switch-Operator Target . See Figure 1 on page 8 .
• The Mini-Rupter Switch blades are in the Open or Closed position that matches the target (by visual verification through the observation window in the switch-compartment door) .
• The Switch-Operator Target signals “Operator Charged” (to indicate the switch operator is ready for the next operation) . See Figure 1 on page 8 .

Then, make sure the protective steel cover (if furnished) is padlocked in place over the switch operator .
The following instructions require the switchgear assembly to be complete and installed in accordance with the applicable drawings, instruction sheets, and wiring diagrams, and in all respects ready for operation.
Automatic Operation
The Type MS-2 Switch Operator will perform Trip Open or Trip Closed operations in response to opening or closing signals initiated by a Source-Transfer Control or by other control devices, including supervisory control. It will also perform a Trip Open operation in response to a signal initiated by a Type SPD Open-Phase Detector. After each trip operation, the switch operator quick- make quick-break mechanism is automatically charged, in 1½ seconds, and is ready for the next operation.
The switch operator will perform these operations when it is either coupled or decoupled, provided normal control power is available and the source-transfer control (if applicable) is in Automatic mode. When used with a Source-Transfer Control, automatic operation of the switch operators requires they are either all coupled or all decoupled.
Decoupling
Follow these steps to decouple the operator:
STEP 1. Turn the DECOUPLING INDICATOR lever to the right and, at the same time, use the handgrip to draw out the operator chassis a short distance, 1 to 4 inches (25 to 102 mm). See Figure 2(b) on page 10.
STEP 2. Release the DECOUPLING INDICATOR lever and push the operator in until it locks in the Decoupled position, about one-half inch (13 mm) from the enclosure stile, as indicated by the DECOUPLING indicator arrow. See Figure 3 on page 11.
When decoupled, the switch operator may be operated without changing the position of the Mini-Rupter Switch.
When decoupled, the Mini-Rupter Switch is prevented from moving by a mechanical device that locks the switch drive shaft.
Because the decoupled switch operator(s) may be operated either manually or electronically without changing the Mini-Rupter Switch position, elective exercising or checkout of the control circuit may be accomplished without an outage.
To prevent tampering with the switch operator while it is decoupled, replace and padlock the protective steel cover (if furnished) over the faceplate. Manual Operation
CAUTION
Do not operate Mini-Rupter Switches unless all doors are closed and latched .
Place the S&C Source-Transfer Control, if furnished, in the Manual (nonautomatic) mode by means of the MANUAL/ AUTOMATIC operation selector switch located on the front of the control.
Then, to operate the switch operator electrica lly (a nd if in the Coupled state, open or close the Mini-Rupter Switch), use the appropriate OPEN or CLOSE pushbutton on the front of the operator.After each trip operation, the switch operator quick-make quick-break mechanism automatically charges in 1½ seconds and is ready for the next operation.
Note: Electrical manual operation may be prevented by electrical- interlock circuits and by the source-transfer control. Pushbutton operation is also prevented when the switch operator manual CHARGING shaft access cover is open. Further, for switch operators in switchgear equipped with a Type AT Source-Transfer Control, pushbutton operation is possible only when the control is in the Manual mode. Source-transfer controls equipped with the optional Overcurrent Lockout feature will also prevent pushbutton operation when a Lockout condition exists. Whenever the electrical or mechanical Non- paralleling feature is furnished, interlocking is provided to prevent a pushbutton operation to close a source switch when the other source switch is already closed.

Figure 3. The switch operator drawout stop released. In the Decoupled position, the switch operator extends about onehalf inch (13 mm) beyond the enclosure stile but still permits attachment of a steel cover and padlock (not shown).
If control power is lost, the switch operator can be manually tripped open or tripped closed, and the switch operator quick-make quick-break mechanism can be manually charged by means of the utility crank stored on the faceplate of the operator. See Figure 3 on page 11.
Lift the EMERGENCY TRIP SHAFT access cover, place the utility crank on the hexagon shaft, and turn in the direction indicated to effect the desired operation. When charging, lift the CHARGING SHAFT access cover, place the utility crank on the hexagon shaft, and turn in the direction needed. About five (5) full turns of the crank are required, and then the “Operator Charged” target will appear. Remove the utility crank and return it to its storage position. When the CHARGING SHAFT access cover is lifted it automatically disconnects the motor-control circuit to prevent electrical charging.
Coupling
Follow these steps to couple the switch operator:
STEP 1. Make sure the switch operator is in the same position as the Mini-Rupter Switch (Open or Closed) by observing the Switch Position and Switch Operator targets.
STEP 2. If required, use the OPEN or CLOSE pushbutton to reposition the switch operator.
STEP 3. Turn the DECOUPLING indicator lever to the right and, at the same time, push on the handgrip to move the operator fully into the enclosure.
STEP 4. Release the DECOUPLING indicator lever and make sure it returns to the Coupled position.

Withdrawing and Reinserting

The switch operator may be withdrawn from the enclosureeither partially—for control-power fuse replacement, or completely—for removal or replacement of the operator mechanism.
CAUTION
When the switch operator is pulled to extend more than 5 inches (127 mm) out of the enclosure, control-circuit components and fast-moving parts are exposed . Therefore, the control-power fuse must be removed and the quick-make quick- break mechanism must be discharged as directed in the following steps . This is a necessary precaution to guard against personal injury, and to avoid possible stalling of the moving parts against the enclosure stile .
To Withdraw the Operator
Follow these steps to open the switch-operator chassis:
STEP 1. Place the Source-Transfer Control, if furnished, in the Manual (nonautomatic) mode.
STEP 2. Turn the DECOUPLING indicator lever to the right and, at the same time, use the handgrip to draw the operator out approximately 5 inches (127 mm) until it strikes against the stop. See Figure 4.
STEP 3. Remove the control-power fuse, located on the right-hand side of the switch operator, directly behind the front panel. If fuse replacement was the reason for opening the switch operator, replace the fuse at this time. Then, proceed to the “To Reinsert  the Operator” section on page 14.
When the switch operator is to be completely withdrawn from the enclosure, proceed to
Step 4. STEP 4. Make sure the control-power fuse has been removed—disconnecting the motor circuit—so the quick-make quick-break mechanism will not automatically charge. Then, use the utility crank to turn the EMERGENCY TRIP shaft in the trip-open or trip-closed direction, as appropriate, to discharge the quick-make quickbreak mechanism. The Operator Discharged target will appear. See Figure 5(a) on page 15.
STEP 5. Loosen, but do not remove, the fi rst stop screw Figure 4. The switch operator decoupled and withdrawn to the stop position five inches (127 mm) beyond the enclosure stile to gain access to the control-power fuse. See Steps 1, 2, and 3.
located at the bottom right and near the front of the operator. This permits overriding the stop.
Turn the DECOUPLING indicator lever to the right and use the handgrip to draw the operator out another 8 inches (203 mm) for a total extension of 13 inches (330 mm)—until it strikes against the second stop. See Figure 5(b) on page 15.
STEP 6. Unplug the control-wiring quick-disconnect connector(s) located at the top of the switch operator. See Figure 6(a) on page 16.
STEP 7. Loosen, but do not remove, the second stop screw located at the bottom right of the operator, at the point now aligned with the edge of the enclosure stile. Access to the second stop screw is intentionally somewhat difficult. See Figure 6(b) on page 16.
STEP 8. Because of the switch operator weight, S&C recommends that two people handle the switch operator or a mechanical support is used during this step.
Turn the DECOUPLING lever to the right and, at the same time, slowly pull the operator just past the second stop point. Then, while firmly supporting the operator, carefully withdraw it from the enclosure.
To Reinsert the Operator
Follow these steps to close the switch-operator chassis:
STEP 1. Make certain the switch operator control-power fuse has been removed and the quick-make quick-break mechanism is discharged as indicated by the Switch Operator target. See Figure 1 on page 8.
Verify the Switch Position target on the switch operator shows “Switch Open” or “Switch Closed,” as appropriate, to match the position of the associated Mini-Rupter Switch.
If repositioning the target is necessary, rotate the switch-target actuating shaft using a screwdriver as a lever at the coupling slot on the rear of the shaft. See Figure 7 on page 17.
Make sure both stop screws, referred to in Steps 5 and 7, are loosened sufficiently to permit the DECOUPLING indicator lever to be turned all the way to the right.
STEP 2. Slide the switch operator into the enclosure, with the top and bottom rollers in their tracks.
Push the operator in until it strikes against the stop position, 13 inches (330 mm) beyond the enclosure stile.
Turn the DECOUPLING indicator lever to the right and, at the same time, push the operator past the stop point. See Figure 6(b) on page 16. Firmly tighten the second stop screw.
STEP 3. Plug in the control-wiring connector(s). See Figure 6(a) on page 16.
STEP 4. Push the operator in until it strikes against the Stop position, 5 inches (127 mm) beyond the enclosure stile. Turn the DECOUPLING indicator lever to the right and push the operator past the stop. Firmly tighten the first stop screw. See Figure 5(b) on page 15.
STEP 5. With the operator in the 5-inch (127-mm) extended position, replace the control-power fuse. The operator will then automatically charge. Push the operator in until it locks in the Decoupled position, as indicated by the DECOUPLING indicator.
STEP 6. Before coupling the switch operator, make sure its position matches that of the Mini-Rupter Switch. Refer to the “Coupling” section on page 12.

If the Operator Stalls

If the switch operator is inadvertently tripped while the associated Mini- Rupter Switch is prevented from operating because of an interlock arrangement, the release of the operator’s quick-make quick-break mechanism will cause the output shaft of the switch operator to stall against the drive-shaft mating parts, held there by the spring tension of the quick-make quick-break mechanism. This can occur as a result of an attempt to manually operate the switch while the enclosure door is open or not completely latched.
NOTICE
Do not try to latch the door at this time because it will cause buckling of the interlock cable and may damage the interlock system .
Follow these steps to reset the system:
STEP 1. To restore the operator to the normal condition, turn the DECOUPLING indicator lever to the right and, at the same time, use the handgrip to forcefully withdraw the operator with a quick, vigorous pull. The quick-make quick-break mechanism will complete its discharge cycle.
The quick-make quick-break mechanism will immediately charge, after which the switch operator is ready to be (manually) tripped back to its previous position for coupling to the Mini-Rupter Switch.
STEP 2. Close and completely latch the enclosure door.
The Type MS-2 Switch Operator is designed and manufactured so routine maintenance is not necessary or recommended.
S&C recommends a common-sense routine to provide periodic exercise for the switch operator because the movable parts of any mechanical device work best when they are actuated from time to time to prevent the coldwelding of mating metal surfaces.
Switch operator exercising should consist of five or more power operations at least once a year, unless normal operating duty provides equal or greater exercise. The switch operator is provided with a convenient means to decouple it from the Mini-Rupter Switch, so exercising the mechanism can be accomplished without requiring the switch itself to be operated.
The life expectancy of the switch operator is 1500 operations (complete close- open cycles), provided no more than 500 of these operations are performed in the Decoupled position.
Before Walking Away
So each Mini-Rupter Switch is ready for normal operation by automatic or supervisory control, make sure the following conditions exist:

• The enclosure door is closed and latched.
• The operator control power is available.
• Operator control-wiring connectors are inserted.
• The operator is charged.
• The operator is coupled.
• The Mini-Rupter Switch is in the position (Open or Closed) dictated by the circuit requirement.
• The control device is reset (i.e., not locked out).
• The Type AT Source-Transfer Control (if furnished) READY indicator lamp is lit. (See the faceplate on the Type AT control for “Conditions required to light READY indicator lamp.”)

S &C Instruction Sheet 629-510
March 7, 2022
© S &C Electric Company 1982-2022, all rights reserved

References

• S&C Electric Company
• Product Literature | S&C Electric

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