Medium-Voltage Metal-Clad Non-Arc-Resistant Switchgear
Type GM-SG (5 kV - 15 kV)
Medium-Voltage Metal-Clad Non-Arc-Resistant Switchgear, Type GM-SG (5 kV to 15 kV)
Description
Siemens type GM-SG 5 kV, 7.2 kV and 15 kV metal-clad power switchgear assemblies with horizontal drawout type GMSG vacuum circuit breakers take advantage of the latest developments in vacuum interrupter technology. Up to two circuit breakers can be stacked in a single vertical section, allowing significant space savings.
The equipment meets or exceeds the latest standards of ANSI, IEEE and NEMA.
Type GM-SG switchgear is designed for use in industrial plants, commercial buildings, electric utility systems, cogeneration installations and other electrical systems. It is commonly used for protection and switching of transformers, motors, generators, capacitors, buses, distribution feeder lines and, in general, for protection of any medium-voltage power circuit.
Siemens‘ experience gained in over 80 years of supplying metal-clad switchgear in the U.S. has been captured in the type GM-SG design. The objective has been to incorporate features designed to provide safety, while simplifying operation, maintenance and minimizing installation cost.
The switchgear structure and the drawout vacuum circuit breaker are an integrated design, with dielectric, thermal and interruption integrity built directly into the basic design, not as an afterthought.
Features
Features include:
- 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 higher 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 type 3AH3 operating mechanism
- Uses the latest developments in vacuum interrupter technology
- Highly reliable vacuum interrupters - MTTF over 57,000 years
- Common type 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
- Available as: indoor (type GM-SG), outdoor non-walk-in (type OGM-SG) and outdoor walk-in shelter-clad NEMA 3R (type SGM-SG) (single-aisle and factory insulated and assembled aisle (optional)).
Dimensions
| Type | Height (H) | Width (W) | Depth (D)4 | Drawout Aisle (DA) | Weight in lbs (kg) |
| Indoor GM-SG | 95.3 (2,419) | 36 (914) | 98.7 (2,507)5 | 72 (1,829) Recommended7 | 3,300 (1,497) |
| Shelter-Clad single-aisle SGM-SG | 114.8 (2,915) | 36 (914)3 | 173.4 (4,404)6 | 72.0 (1,829) Included | 5,000 (2,268) |
| Aisle-less non-walk-in OGM-SG | 113.6 (2,886) | 36 (914)3 | 101.9 (2,588)6 | 72 (1,829) Recommended7 | 3,950 (1,792) |
| Circuit Breaker Type | Continuous Current 1,200 A | Continuous Current 2,000 A | Continuous Current 3,000 A |
| 5-GMSG-40/5-GMSG-250 | 440 (200) | 650 (295) | 665 (302) |
| 5-GMSG-50/5-GMSG-350 | 455 (206) | 665 (302) | 670 (304) |
| 5-GMSG-63 | 809 (368) | 819 (372) | 824 (375) |
| 7-GMSG-40/7-GMSG-500 | 455 (206) | 665 (302) | 675 (306) |
| 15-GMSG-25/15-GMSG-500 | 430 (195) | 640 (290) | ---- |
| 15-GMSG-40/15-GMSG-750 | 445 (202) | 670 (304) | 675 (306) |
| 15-GMSG-50/15-GMSG-1000 | 460 (209) | 675 (306) | 680 (308) |
| 15-GMSG-63 | 819 (372) | 829 (377) | 834 (379) |
| 5-GMSG-GCB-40/15-GMSG-GCB-40 | 475 (215) | 685 (311) | 715 (324) |
| 5-GMSG-GCB-50/15-GMSG-GCB-50 | 825 (374) | 835 (379) | 865 (392) |
| 5-GMSG-GCB-63/15-GMSG-GCB-63 | 875 (397) | 900 (408) | 930 (427) |
Footnotes:
1 Weight does not include circuit breakers. Add separately from Type GMSG Circuit Breaker Weight in lbs (kg) table.
2 Weight and dimensions are approximate.
3 Add 6" (152 mm) to each end of lineup for aisle extension 12" (304 mm) total.
4 Dimensions are approximate size of floor footprint. For outdoor equipment, enclosure overhangs floor frame. Refer to Footnote 7.
5 If indoor switchgear is installed on a raised housekeeping pad, the pad must not extend further than 3" (75 mm) from the front of the switchgear to avoid interference with the use of the portable lift truck.
6 Add roof and enclosure overhang:
Rear (cable side):
Non-walk-in: 3.6" (92 mm)
Shelter-Clad: 3.6" (92 mm).
Front (drawout side):
Non-walk-in: 3.7" (94 mm)
Shelter-Clad: 1.7" (43 mm).
7 72" (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" (1,651 mm). Minimum aisle space required if all circuit breakers are at floor level is 55" (1,397 mm).
8 Approximate circuit breaker dimension (width X depth X height):
32" (813 mm) X 39" (991 mm) X 36" (914 mm). If packed for shipment separate from switchgear: 42" (1,067 mm) x 47" (1,194 mm) X 43" (1,092 mm).
9 Weight estimates are for circuit breaker only. Add 75 lbs (34 kg) if shipped separately packaged.
Ratings
Constant kA basis - ANSI/IEEE C37.06-2009
These ratings are in accordance with:
- ANSI/IEEE C37.04-1999 Standard Rating Structure for AC High-Voltage Circuit Breakers
- ANSI/IEEE C37.06-2009 AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis - Preferred Ratings and Related Required Capabilities for Voltages Above 1,000 Volts
- ANSI/IEEE C37.09-1999 Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis
- ANSI/IEEE C37.010-1999 Application Guide for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis.
| Circuit Breaker Type1 | Maximum Design Voltage (V)2 kV rms | Voltage Range Factor (k)3 | Withstand Voltage Levels/ Power Frequency kV rms | Withstand Voltage Levels/ Lightning Impulse (BIL) kV crest | Continuous Current4 A rms | Short-Circuit (I)5,6 kA rms sym |
| 5-GMSG-40-xxxx-104 | 4.76 | 1.0 | 19 | 60 | 1,200, 2,000, 3,000, 4,000FC | 40 |
| 5-GMSG-50-xxxx-130 | 4.76 | 1.0 | 19 | 60 | 1,200, 2,000, 3,000, 4,000FC | 50 |
| 5-GMSG-63-xxxx-164 | 4.76 | 1.0 | 19 | 60 | 1,200, 2,000, 3,000, 4,000FC | 63 |
| 7-GMSG-40-xxxx-104 | 8.25 | 1.0 | 36 | 95 | 1,200, 2,000, 3,000, 4,000FC | 40 |
| 15-GMSG-25-xxxx-65 | 15 | 1.0 | 36 | 95 | 1,200, 2,000 | 25 |
| 15-GMSG-40-xxxx-104 | 15 | 1.0 | 36 | 95 | 1,200, 2,000, 3,000, 4,000FC | 40 |
| 15-GMSG-50-xxxx-130 | 15 | 1.0 | 36 | 95 | 1,200, 2,000, 3,000, 4,000FC | 50 |
| 15-GMSG-63-xxxx-164 | 15 | 1.0 | 36 | 95 | 1,200, 2,000, 3,000, 4,000FC | 63 |
| Circuit Breaker Type1 | Interrupting Time7 ms/cycles | Permissible Tripping Delay (y) Sec | Maximum Symmetrical Interrupting (I) kA rms sym | % dc Component | Short Time Current (I) (Three Seconds) kA rms | Closing and Latching (Momentary) Asymmetrical (1.55 x I) kA rms | Closing and Latching (Momentary) Peak (2.6 x I) peak |
| 5-GMSG-40-xxxx-104 | 83/5 | 2 | 40 | 47 | 40 | 62 | 104 |
| 5-GMSG-50-xxxx-130 | 83/5 | 2 | 50 | 47 | 50 | 78 | 130 |
| 5-GMSG-63-xxxx-164 | 83/5 | 2 | 63 | 47 | 63 | 98 | 164 |
| 7-GMSG-40-xxxx-104 | 83/5 | 2 | 40 | 47 | 40 | 62 | 104 |
| 15-GMSG-25-xxxx-65 | 83/5 | 2 | 25 | 47 | 25 | 39 | 65 |
| 15-GMSG-40-xxxx-104 | 83/5 | 2 | 40 | 47 | 40 | 62 | 104 |
| 15-GMSG-50-xxxx-130 | 83/5 | 2 | 50 | 47 | 50 | 78 | 130 |
| 15-GMSG-63-xxxx-164 | 83/5 | 2 | 63 | 47 | 63 | 98 | 164 |
Footnotes:
1 “xxxx” in type designation refers to the continuous current rating 1,200 A, 2,000 A or 3,000 A, as appropriate. The 4,000 A fan-cooled rating is achieved using a 3,000 A circuit breaker, in combination with fan cooling as indicated in Footnote 4.
2 Maximum design voltage for which the circuit breaker is designed and the upper limit for operation.Maximum design voltage for which the circuit breaker is designed and the upper limit for operation.
3 K is listed for information purposes only. For circuit breakers rated on a "constant kA" ratings basis, the voltage range factor is 1.0.K is listed for information purposes only. For circuit breakers rated on a "constant kA" ratings basis, the voltage range factor is 1.0.
4 4,000FC indicates that fan cooling is included in the switchgear structure for this rating. 4,000 A rating is not available in outdoor equipment. 4,000FC indicates that fan cooling is included in the switchgear structure for this rating. 4,000 A rating is not available in outdoor equipment.
5 All values apply to polyphase and line-to-line faults.All values apply to polyphase and line-to-line faults.
6 Standard duty cycle is O - 0.3s - CO - 3 min. - CO.Standard duty cycle is O - 0.3s - CO - 3 min. - CO.
7 Standard rating interrupting time is five-cycles (83 ms). Optional rated interrupting time of three-cycles (50 ms) is available (except with 24 Vdc tripping).Standard rating interrupting time is five-cycles (83 ms). Optional rated interrupting time of three-cycles (50 ms) is available (except with 24 Vdc tripping).
Accessories
Accessories
Standard accessories include:
- Manual racking crank
- Spring charging crank
- Drawout extension rails (facilitate handling of circuit breakers in upper cell)
- Lifting sling (for circuit breakers above floor level)
- Split plug jumper (standard unless test cabinet is furnished)
- Contact lubricant
- Touch-up paint.
Optional accessories include:
- Circuit breaker lift device
- Test cabinet (in place of split plug jumper)
- Test plugs (if required by devices)
- Electrical racking motor assembly (to enable racking while operator is at a distance from the switchgear)
- Manual or electrical ground and test device.
Test provisions, either a split plug jumper or a test cabinet, are available for testing the circuit breaker outside its cubicle.
The split plug jumper is used to bridge the secondary disconnects with a flexible cable, so the circuit breaker may be electrically closed and tripped with the control switch on the instrument panel while the circuit breaker is outside of its compartment. The test cabinet, including a control switch, is used for closing and tripping the circuit breaker at a location remote from the switchgear.
