No-Load Circuit Isolation
Designed to open and close a circuit when voltage is present but no load current is flowing. Operation must follow the no-load switching duty specified for the disconnector.
GreenPower
GN27-40.5kV Indoor Disconnector Switch
Rated Voltage40.5 kV
Rated Current630 / 1250 / 1600 / 2000 A
Short-Time Withstand Current20 / 31.5 / 40 kA, 4 s
Lightning Impulse Withstand200 kV
Product Overview
GN27-40.5kV is a three-phase indoor high-voltage disconnector for 40.5 kV, 50/60 Hz AC systems. It opens and closes circuits under no-load conditions and uses a common-base knife-blade structure. The series covers rated currents from 630 A to 2000 A, with manual operation using the CS6-1 mechanism and several outline arrangements for installation planning.
Three-Phase Common Base
The three phases share a common base and operating shaft. Operating insulators transmit shaft movement to the blades for opening and closing.
Key Features
Double-Blade Current Path
Each phase uses two spring-loaded blades on the contact base, forming the moving part of the current path.
Spring-Loaded Contact Fingers
The fixed contacts use spring-loaded contact fingers with vertical compliance to support reliable blade engagement.
Multiple Installation Variants
The series includes standard, C1, D1, C1D2, ST and MJ outline arrangements. Match the selected model to the installation drawing.
Technical Specifications
Short-time and peak withstand ratings depend on the rated-current version. Use the matching column when selecting a model.
| Parameter | 630 A | 1250 A | 1600 A | 2000 A |
|---|---|---|---|---|
| Rated Voltage | 40.5 kV | 40.5 kV | 40.5 kV | 40.5 kV |
| Rated Frequency | 50 / 60 Hz | 50 / 60 Hz | 50 / 60 Hz | 50 / 60 Hz |
| Rated Current | 630 A | 1250 A | 1600 A | 2000 A |
| Short-Time Withstand Current (r.m.s.), 4 s | 20 kA | 31.5 kA | 31.5 kA | 40 kA |
| Peak Withstand Current | 50 kA | 80 kA | 80 kA | 100 kA |
| Rated Lightning Impulse Withstand Voltage | 200 kV | 200 kV | 200 kV | 200 kV |
Structure And Operation
CS6-1 Manual Mechanism
During opening, the operating crank turns the main shaft and the operating insulators lift the blades away from the fixed contacts. Turning the shaft in the opposite direction pulls the blades downward into the fully closed position.
Supported Contact Assembly
The frame uses bent plates and angle steel with six support insulators, two per phase. The fixed contacts and spring-loaded blades form the conducting path, while the operating insulators provide the mechanical drive.
Model Variants And Installation
The catalog provides six outline and mounting drawings with 460 mm phase spacing. Select the exact configuration and check its mounting points and operating clearance before installation.
| Model Shown In Catalog | Rated Current Shown | Phase Spacing |
|---|---|---|
| GN27-40.5/630A-460 | 630 A | 460 mm |
| GN27-40.5C1/630A-460 | 630 A | 460 mm |
| GN27-40.5D1/630A-460 | 630 A | 460 mm |
| GN27-40.5C1D2/1600A-460 | 1600 A | 460 mm |
| GN27-40.5ST/630A-460 | 630 A | 460 mm |
| GN27-40.5MJ/630A-460 | 630 A | 460 mm |
Download the catalog for the complete dimensioned drawings. The MJ outline includes an electric motor; confirm the required operating mechanism and control supply when ordering this arrangement.
Service Conditions
Altitude
1000 to 3000 m.
Ambient Temperature
-25°C to +40°C, with a daily average not exceeding +35°C.
Relative Humidity
Daily average not exceeding 95%; monthly average not exceeding 90%.
Seismic Intensity
Not exceeding degree 8.
Installation Environment
Indoor locations free from fire or explosion hazards, severe pollution, chemical corrosion and severe vibration.
Special Service Conditions
Conditions outside these limits require agreement between the user and the manufacturer.
Request Technical Confirmation For GN27-40.5kV
Please specify the model and configuration, rated voltage, rated current, required withstand ratings, operating mechanism and site conditions. Include the applicable outline drawing and any special installation requirements.