Medium-voltage metal-clad switchgear
Type GM-SG (5 kV - 15 kV)
- Description
- Ratings
- Dimensions in inches
The Siemens type GM-SG 5 kV - 15 kV medium-voltage switchgear is a product enhancement to the successful type GM switchgear product line. The type GM-SG product maintains all the benefits and features of the type GM product and now utilizes the globally proven Siemens type 3AH3 circuit breaker operator. Performance gains in higher interrupting ratings and faster interrupting times are now available with the type 3AH3 circuit breaker operator. Maintenance intervals also improve, with maintenance 10 years or 10,000 operations (whichever occurs first) under "usual service conditions" as defined by ANSI/IEEE C37.20.2 section 2. Over 60,000 type 3AH3 circuit breaker operators are in service throughout the world.
- One-high or two-high construction
- Up to 100 full-fault interruptions
- Universal spare circuit breaker for 50 kA and lower ratings
- Universal spare circuit breaker for 63 kA ratings
- 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
- 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 type 3AH3 operators produced since 1998
- Generator circuit breakers (to IEEE C37.013 optionally available)
- 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 GM-SG switchgear available as: indoor (type GM-SG), outdoor non-walk-in (type OGM-SG) NEMA 3R and outdoor walk-in shelter-clad (type SGM-SG) NEMA 3R (single-aisle, common-aisle and factory insulated and assembled aisle (optional for single-aisle))
Constant kA basis - ANSI/IEEE C37.06-2000
| Historic "MVA" class | Maximum design voltage kV | Rated inter- rupting kA | Maximum interrupting and short-time kA | Voltage range factor | Continuous current [1] | Insulation levels dielectric 60 Hz | Insulation levels dielectric BIL | Close & latch (kA) rms 1.55 KI | Close & latch (kA) Peak 2.61 KI |
| ---- | 4.76 | 40 | 40 | 1.0 | 1,200, 2,000 | 19 | 60 | 62 | 104 |
| ---- | 4.76 | 50 | 50 | 1.0 | 1,200, 2,000, 3,000 | 19 | 60 | 78 | 130 |
| ---- | 4.76 | 63 | 63 | 1.0 | 1,200, 2,000, 3,000 | 19 | 60 | 98 | 164 |
| ---- | 8.25 | 40 | 40 | 1.0 | 1,200, 2,000, 3,000 | 36 | 95 | 62 | 104 |
| ---- | 15 | 25 | 25 | 1.0 | 1,200, 2,000 | 36 | 95 | 39 | 65 |
| ---- | 15 | 40 | 40 | 1.0 | 1,200, 2,000, 3,000 | 36 | 95 | 62 | 104 |
| ---- | 15 | 50 | 50 | 1.0 | 1,200, 2,000, 3,000 | 36 | 95 | 78 | 130 |
| ---- | 15 | 63 | 63 | 1.0 | 1,200, 2,000, 3,000 | 36 | 95 | 98 | 164 |
Footnotes:
[1] 4,000 A fan-cooled available, using a 3,000 A circuit breaker together with a modified switchgear structure incorporating fan cooling equipment.
| Type | Width (W) | Height (H) | Depth (D) | Drawout aisle (DA) |
| Indoor | 36 (914) | 95.25 (2,419) | 98.5 (2,502) | 72 (1829) recommended [1] |
Footnotes:
[1] 72 inches (1,829 mm) aisle space recommended, allows room for interchange of circuit breakers. Minimum aisle space is required for handling circuit breakers with lift truck is 65 inches (1,651 mm). Minimum aisle space required if all circuit breakers are at floor level is 55 inches (1,397 mm).
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