Outdoor High-Voltage Disconnector GW4-27.5D (Horizontal Opening, With Earthing Knife)
- Model
- GW4-27.5D
- Standard
- TB/T 3150-2007；TJ/GD 023-2018
- Category
- Disconnector
- Documents & pricing
- Type test reports, factory inspection records and quotations are available on request; tender documents are archived by project.
Product Overview
The GW4-27.5D outdoor high-voltage disconnector features horizontal opening and has an earthing knife. It is used for line isolation and maintenance in the 27.5kV traction power supply system of electrified railways.
CRCC Certification Information
| Item | Content |
|---|---|
| Certified unit | Motorized disconnector for overhead contact systems (200km/h and below) |
| Certificate No. | CRCC10226P12329R1S-004 |
| Certificate validity | 2026-06-11 to 2027-11-22 |
| Certification body | China Railway Test & Certification Center (CRCC) |
| Applied standard | GB/T 32580.2-2026 |
Technical Parameters
| Parameter | Value |
|---|---|
| Product model | GW4-27.5D |
| Opening mode | Horizontal opening |
| Earthing knife configuration | With earthing knife |
| Installation | Outdoor |
| Rated voltage | 27.5kV |
| Rated current | 400A～3150A |
| Optional current ratings | 1250A / 1600A / 2000A / 2500A / 3150A |
| Applicable speed class | 200km/h and below |
| Rated voltage (Ur) | 27.5 kV / 2×27.5 kV / 55 kV |
| Nominal voltage (Un) | 25 kV / 2×25 kV / 50 kV |
| Rated frequency (fr) | 50 Hz |
| Rated short-time withstand current (Ik) | 16 / 20 / 25 / 31.5 kA (optional) |
| Rated peak withstand current (Ip) | Equal to 2.5 times the rated short-time withstand current |
Note: The above values are taken from Chapter 5 (ratings) of GB/T 32580.2-2026 "Railway Applications - Fixed Installations - High-Voltage AC Switchgear and Instrument Transformers - Part 2: Disconnectors, Earthing Switches and Load Switches".
Structural Features
- Horizontal-opening construction with clearly visible open and closed positions
- With an earthing knife, providing a visible isolation point during maintenance
- Outdoor-type construction, resistant to pollution and rain
- Can be fitted with a motorized or manual operating mechanism
- Applicable speed class 200km/h and below
Scope of Application
Suitable for traction substations, switching posts, sectioning posts and electrical sectioning points of the overhead contact system.
For the same model there is also a certified unit "motorized disconnector for substation use", certificate CRCC10224P12329R1S-003.
Note: Parameters such as the specific rated continuous current steps, the mechanical endurance class and the rated insulation level (lightning impulse / power-frequency withstand) are subject to the annex of the CRCC certificate and the factory test report, which are available on request.