SIEMENS 4 Pole WL Low Voltage Switchgear Installation Guide
- June 10, 2024
- SIEMENS
Table of Contents
SIEMENS 4 Pole WL Low Voltage Switchgear
Product Information
The 4 Pole WL Low Voltage Switchgear is a type of switchgear that provides neutral isolation capability which is advantageous for low voltage switchgear applications where multiple separately derived power sources are individually grounded. This switchgear is equipped with a 4 pole breaker that eliminates the problem of multiple neutral grounding points and multiple paths for ground fault and normal neutral current when only one main breaker is closed at a time. It is rated for UL 1066 Listed (ANSI C37) Listed Breakers and has frame ratings for Frame Size 2 and Frame Size 3. The WL Power Circuit Breaker is also part of this switchgear and has various ratings and applicable rating plug ranges depending on the frame size.
Product Usage Instructions
To use the 4 Pole WL Low Voltage Switchgear, follow these instructions:
- Ensure that the switchgear is installed and wired correctly according to the manufacturer’s instructions.
- For a typical 3-phase 4-wire Main-Main or Main-TieMain low voltage switchgear application, solidly connect the neutral throughout the equipment and ground (bond) the neutral at each incoming source.
- For a low voltage switchgear application where multiple separately derived power sources are individually grounded, use the 4 pole breaker in conjunction with traditional residual or zero sequence ground fault to prevent nuisance ground fault tripping and/or failure to trip on ground fault.
- If using a 4 Pole main breaker, ensure that only one main breaker is closed at a time to eliminate the problem of multiple neutral grounding points and multiple paths for ground fault and normal neutral current.
- Refer to the WL Power Circuit Breaker ratings and applicable rating plug range based on the frame size for proper usage and maintenance.
4 Pole WL Low Voltage Switchgear
4 pole breakers provide the neutral isolation capability that is advantageous for low voltage switchgear applications where multiple separately derived power sources are individually grounded. In a typical 3-phase 4-wire Main-Main or Main-Tie-Main low voltage switchgear application the neutral is solidly connected throughout the equipment. Additionally the neutral is grounded (bonded) at each incoming source and this provides multiple paths for ground fault and normal neutral current to flow. If a 3 pole breaker is used in conjunction with traditional residual or zero sequence ground fault, nuisance ground fault tripping and/or failure to trip on ground fault can occur.
With a 4-pole main breaker, the neutral is disconnected (isolated) when the breaker is open and provided that only one main breaker is closed at a time, the problem with multiple neutral grounding points and multiple paths for ground fault and normal neutral current is eliminated.
WL Power Circuit Breaker
Ratings for UL 1066 Listed (ANSI C37) Listed Breakers
| WL Frame Ratings – Frame Size 2 | 800A | 1600A |
|---|---|---|
| Rating Class | S | H |
| Interrupting current frame I cs (kAIR RMS) 50/60Hz | ||
| 254VAC | 65 | 85 |
| 508VAC | 65 | 85 |
| 635VAC | 65 | 65 |
| Short-time current I cw (kA RMS) | 1 sec. | 65 |
| Close and latch rating (kA RMS) | 65 | 65 |
| Applicable rating plug range | 200-800A | 200-1600A |
| Mechanical make-time (ms) | 35 | 35 |
| Mechanical break-time (ms) | 34 | 34 |
| Electric close make-time (ms) | 50 | 50 |
| Electric trip/UV break-time (ms) | 40/73 | 40/73 |
| Electric trip and reclose interval (ms) | 80 | 80 |
| Mechanical duty cycles (with maint.)a | 15000 | 15000 |
| Electrical duty cycles (with maint.)a | 15000 | 15000 |
| Draw-out breaker efficiency (Watts loss at rated I n) | 85 | 320 |
| Ambient operating temperature (˚C) | -25 to 40 | -25 to 40 |
| Weights (D.O. Breaker/Cradle/Fixed mount) lbs. | 210/161/185 | 210/161/185 |
| WL Frame Ratings – Frame Size 2 | 2000A | 3200A |
| --- | --- | --- |
| Rating Class | S | H |
| Interrupting current frame I cs (kAIR RMS) 50/60Hz | ||
| 254VAC | 65 | 85 |
| 508VAC | 65 | 85 |
| 635VAC | 65 | 65 |
| Short-time current I cw (kA RMS) | 1 sec. | 65 |
| Close and latch rating (kA RMS) | 65 | 65 |
| Applicable rating plug range | 200-2000A | 200-3200A |
| Mechanical make-time (ms) | 35 | 35 |
| Mechanical break-time (ms) | 34 | 34 |
| Electric close make-time (ms) | 50 | 50 |
| Electric trip/UV break-time (ms) | 40/73 | 40/73 |
| Electric trip and reclose interval (ms) | 80 | 80 |
| Mechanical duty cycles (with maint.)a | 15000 | 15000 |
| Electrical duty cycles (with maint.)a | 15000 | 15000 |
| Draw-out breaker efficiency (Watts loss at rated I n) | 700 | 1650 |
| Ambient operating temperature (˚C) | -25 to 40 | -25 to 40 |
| Weights (D.O. Breaker/Cradle/Fixed mount) lbs. | 227/181/203 | 258/212/229 |
- Maintenance means: replacing main contacts and arc chutes (see operating instructions).
Ratings for UL 1066 Listed (ANSI C37) Listed Breakers
| WL Frame Ratings – Frame Size 3 | 4000A | 5000A | 6000A |
|---|---|---|---|
| Rating Class | L | L | L |
| Interrupting current frame I cs (kAIR RMS) 50/60Hz | |||
| 254VAC | 100 | 100 | 100 |
| 508VAC | 100 | 100 | 100 |
| 635VAC | 85 | 85 | 85 |
| Short-time current I cw (kA RMS) | 1 sec. | 85 | 85 |
| Close and latch rating (kA RMS) | 85 | 85 | 85 |
| Applicable rating plug range | 800-4000A | 800-5000A | 800-6000A |
| Mechanical make-time (ms) | 35 | 35 | 35 |
| Mechanical break-time (ms) | 34 | 34 | 34 |
| Electric close make-time (ms) | 50 | 50 | 50 |
| Electric trip/UV break-time (ms) | 40/73 | 40/73 | 40/73 |
| Electric trip and reclose interval (ms) | 80 | 80 | 80 |
| Mechanical duty cycles (with maint.)a | 10000 | 10000 | 10000 |
| Electrical duty cycles (with maint.)a | 10000 | 10000 | 10000 |
| Draw-out breaker efficiency (Watts loss at rated I n) | 1100 | 1650 | 2475 |
| Ambient operating temperature (˚C) | -25 to 40 | -25 to 40 | -25 to 40 |
| Weights (D.O. Breaker/Cradle/Fixed mount) lbs. | 434/410/375 | 434/410/375 |
434/410/375
Ratings for UL 1066 Listed Non-Automatic Switches
WL Frame Ratings| Frame Size 2 800-2000A| Frame Size 3
3200-6000A
---|---|---
Rating Class| L| L
Breaking capacity with external relay (kA RMS)| 254VAC| 100| 100
50/60Hz, instantaneous trip| 508VAC| 100| 100
| 635VAC| 85| 85
Short-time current I cw (kA RMS)| 1 sec.| 85| 100b
- Maintenance means: replacing main contacts and arc chutes (see operating instructions).
- Do not apply a switch or breaker rated at 635VAC to a system with a fault current > 85kA RMS.
Dimensional Information
Breaker Type/LVS Section Width
- 800-3200A (FS2) 32”
- 4000-6000A (FS3) 40”
4 Pole Main/Tie Section 800 – 5000A Breakers
FS2 4 Pole Main/Tie Breaker Section
Blank or Instrument Compartment
Feeder Breaker 800,
1600, 2000
Main/Tie Breaker 800, 1600, 2000,
3200
Blank or Instrument Compartment
Feeder Breaker 800, 1600, 2000,
3200
Blank or Instrument Compartment
Feeder Breaker 800, 1600, 2000,
3200
FS2 4 Pole Main/Tie Breaker Section
Blank or Instrument Compartment
Feeder Breaker 800,
1600, 2000
Blank or Instrument Compartment
Feeder Breaker 800, 1600, 2000,
3200*
Main/Tie Breaker 800, 1600, 2000, 3200
Blank or Instrument Compartment
Feeder Breaker 800, 1600, 2000,
3200*
FS3 4 Pole Main/Tie Breaker Section
Blank or Instrument Compartment
Main/Tie Breaker 4000, 5000
Blank or Instrument Compartment (4000A only)
Vent Panel (5000A)
Blank or Instrument Compartment
FS3 4 Pole Main/Tie Breaker Section
Blank or Instrument Compartment
Blank or Instrument Compartment
Main/Tie Breaker 4000, 5000
Blank or Instrument Compartment (4000A only)
Vent Panel (5000A)
4 Pole Main/Tie Section 6000A Breaker
FS3 4 Pole Main/Tie Breaker Section
Blank or Instrument Compartment
Main/Tie Breaker 6000
Vent Panel & Fan Control
4 Pole Feeder Section 800 – 3200A Breakers
FS2 4 Pole Feeder Breakers
Feeder Breaker 800, 1600, 2000
Feeder Breaker 800, 1600, 2000, 3200
Feeder Breaker 800, 1600, 2000, 3200
Feeder Breaker 800, 1600, 2000, 3200*
Contact the factory for 3200A feeder breaker application guidelines.
Contact Information
Siemens Industry, Inc.
5400 Triangle Parkway Norcross, GA 30092
1-800-241-4453
info.us@siemens.com
Order No. PDSA-4PSWG-0915 | Printed in USA | © 2015, Siemens Industry, Inc.
www.usa.siemens.com/switchgear.
The information provided in this selection and application guide contains merely general descriptions or characteristics of performance which in case of actual use do not always apply as described or which may change as a result of further development of the products. An obligation to provide the respective characteristics shall only exist if expressly agreed in the terms of the contract. All product designations may be trademarks or product names of Siemens AG or supplier companies whose use by third parties for their own purposes could violate the rights of the owners.