Medium-voltage metal-clad arc-resistant switchgear, type GM-SG-AR (5 kV - 15 kV)
As of October 1, 2008, our U.S. business is called Siemens Energy, Inc.
- Medium-voltage metal-clad arc-resistant switchgear, type GM-SG-AR (5 kV - 15 kV) overview
Medium-voltage metal-clad arc-resistant switchgear, type GM-SG-AR description and features
Arc-resistant to IEEE C37.20.7-2007, up to 50 kA, 0.5 sec, accessibility type 2B
Application flexible exhaust system
Top-mounted pressure relief channel factory-installed for reduced installation time
One-high or two-high construction
Up to 100 full-fault interruptions
Universal spare circuit breaker
Interlocks permit insertion of high rating vacuum circuit breaker into lower rated cell but not vice-versa
Front accessible circuit breaker operating mechanism for ease of maintenance
Closed-door racking
Floor rollout circuit breaker in lower cell without a dolly
Visible secondary disconnect
Circuit breaker ships inside of cell, thus reducing installation cost and transit damage
Instrumentation / controls located in a separate compartment isolated from all primary circuit elements
Pair with Siemens protective relays to match any typical application
Horizontal drawout type GMSG vacuum circuit breaker with 3AH3 operating mechanism
Uses the latest developments in vacuum interrupter technology
Highly reliable vacuum interrupters - MTTF over 42,000 years
Common 3AH3 operator platform for all ratings
Over 60,000 3AH3 operators produced since 1998
10,000 operations to overhaul
Three-cycle interrupting time (optional)
Meets or exceeds the latest ANSI, IEEE and NEMA standards
UL or C-UL Listing available
Type GMSG circuit breaker ratings constant kA basis - ANSI C37.06-2000
Historic "MVA" class | Maximum design voltage kV | Rated inter-rupting kA | Maximum inter-rupting and short-time kA | Voltage range factor | Continuous current1 | Insulation levels dielectric 60 Hz | Insulation levels dielectric BIL | Close and latch (kA) rms 1.55 KI | Close and latch (kA) peak 2.6 KI |
- - - - | 4.76 | 40 | 40 | 1.0 | 1200, 2000 | 19 | 60 | 62 | 104 |
- - - - | 4.76 | 50 | 50 | 1.0 | 1200, 2000, 3000 | 19 | 60 | 78 | 130 |
- - - - | 8.25 | 40 | 40 | 1.0 | 1200, 2000, 3000 | 36 | 95 | 62 | 104 |
- - - - | 15.0 | 25 | 25 | 1.0 | 1200, 2000 | 36 | 95 | 39 | 65 |
- - - - | 15.0 | 40 | 40 | 1.0 | 1200, 2000, 3000 | 36 | 95 | 62 | 104 |
- - - - | 15.0 | 50 | 50 | 1.0 | 1200, 2000, 3000 | 36 | 95 | 78 | 130 |
1 4000 A fan-cooled available, using a 3000 A circuit breaker together with a modified switchgear structure incorporating fan cooling equipment.
Type GM-SG-AR switchgear dimensions in inches (mm)
Type | Width (W)3 | Height (H)2 | Depth (D)4 | Drawout aisle (DA)1 |
Indoor | 40 (1016) | 116.4 (2957) | 98.5 (2502) | 72 (1829) |
172 inches (1829 mm) aisle space recommended and allows room for interchange of circuit breakers. Minimum aisle space required for handling circuit breakers with lift truck is 65 inches (1651 mm). Minimum aisle space required if all circuit breakers are at floor level is 55 inches (1397 mm).
2No obstructions permitted within 10 inches (254 mm) of top of switchgear structure.
3Add 9.0 inches (229 mm) to length of lineup for end trims.
4Add 4.5 inches (114 mm) to depth for rear door.
5An exhaust system to direct arc fault products outside of the switchgear room is supplied with each lineup of equipment.