GW4-27.5/1250 Outdoor HV Disconnect Switch (27.5kV, 1250A)
GB 1985-2014 | Rated 1250A | Proven GW4 platform
Specifications
| Model | GW4-27.5/1250 |
|---|---|
| Standard | GB 1985-2014 HV AC disconnectors and earthing switches; TB/T railway industry standards |
| Rated Voltage | 27.5kV / 10kV / 15kV (per model) |
| Design Speed | N/A (fixed installation equipment) |
| Operating Temperature | -40°C to +70°C |
| Altitude | ≤ 4,000 m |
| Materials | Hot-dip galvanized steel frame; copper alloy contacts; high-strength post insulators |
| Installation | Pole-side or independent foundation mounting; manual / motorized / hand-crank operating mechanisms |
The GW4-27.5/1250 is an outdoor high-voltage disconnect switch rated 27.5kV and 1250A, designed for electrical isolation in electrified railway traction power supply systems. It belongs to the widely used GW4 platform, valued for stable performance and straightforward maintenance.
Designed per GB 1985-2014 and TB/T railway industry standards, the switch features a hot-dip galvanized steel frame, copper alloy contacts and high-strength post insulators, operating from -40°C to +70°C at altitudes up to 4,000 m.
Mounting is pole-side or on independent foundations; manual, motorized and hand-crank operating mechanisms are available to match the site's automation level.
Henan Chuangwei Railway Equipment Co., Ltd. supplies the GW4 series with complete type test documentation for traction power projects.
Frequently Asked Questions
What does the 1250 in GW4-27.5/1250 mean?
It is the rated current: 1250A at 27.5kV rated voltage, suitable for typical railway traction feeder isolation duty.
Which standards does it meet?
GB 1985-2014 for HV AC disconnectors and earthing switches, plus TB/T railway industry standards.
Is a motorized version available?
Yes — motorized, manual and hand-crank mechanisms are all available.
Performance
Operating Conditions
Outdoor traction power service from -40°C to +70°C, altitudes to 4,000 m, including polluted and humid environments.
Mechanical
Proven GW4 double-column horizontal-break platform with galvanized frame and copper alloy contacts, rated 1250A.
Electrical
27.5kV / 1250A isolation per GB 1985-2014 for railway traction power supply systems.
Applications
Traction Feeders
Feeder isolation on 27.5kV traction networks.
Traction Substations
Incoming and outgoing line isolation.
Outdoor Service
Galvanized structure for open-air duty.
Cold Regions
Operation down to -40°C.