Overview
GN30-12 indoor rotary high-voltage isolating switch is a new type of isolating switch of rotary contact blade type. The main structure is to fix two groups of insulators and contacts on the upper and lower planes of the three-phase common chassis. Rotate the contact knife to realize the opening and closing of the switch.
GN30-12D indoor rotary high-voltage isolation switch is the addition of a knife on the basis of GN30-12 indoor rotary high-voltage isolation switch, which can meet the needs of different power systems. This product is compact in design, small in space, strong in insulation, and easy to install and adjust. Its performance meets the requirements of GB1985-89 "AC High Voltage Isolating Switches and Earthing Switches". It is used for opening and closing circuits under the condition of voltage and no load. It can be used together with high voltage switchgear or alone.
Model Meaning

Normal Use Environment
1. The altitude does not exceed 1000m;
2. Ambient air temperature: upper limit +40°C; lower limit -10°C;
3. Relative humidity: the daily average is not more than 95%; the monthly average is not more than 90% dry;
4. The seismic intensity does not exceed 8 degrees;
5. Places without severe dust, chemical corrosive and explosive substances; 6. Places without frequent violent vibrations.
Technical Parameters
| Model | GN30-12/400-12.5 | GN30-12/630-12.5 | GN38-12/1200-31.5 | GN38-12/1250-31.5 | |
| GN30-12D/12.5 | GN30-12D/630-20 | GN38-12/D1200-31.5 | GN30-12D/1250-31.5 | ||
| Rated voltage (KV) | 12 | ||||
| Rated current (A) | 400 | 630 | 1000 | 1250 | |
| Thermal stability current (KA) | 12.5 | 20 | 31.5 | ||
| Thermal stabilization time (S) | 4 | ||||
| Dynamic stability current (KA) | 31.5 | 50 | 80 | ||
| Rated insulation level | Lightning impulse voltage (KV) | Phase-to-phase, relative to ground 75, fracture 85 | |||
| 1min power frequency voltage (KV) | Phase, relative to 42, fracture 48 | ||||
Installation Dimensions

> What Makes a Charging Connector Reliable for Daily EV Charging?
A Charging Connector is more than a cable end—it’s the critical interface between the EV and the charger. With GB, EU, and US standard options, mechanical life of ≥1...
> How Often Should You Inspect and Maintain Your Charging Connector?
Your EV charging connector is the most frequently handled component in your charging infrastructure. Every day, it gets plugged in, unplugged, dropped, stepped on, a...
> How Does a Liquid Level Relay Automate Your Water Pump?
Automatic water pump control using liquid level relay. Wiring diagrams for fill and drain modes, electrode selection, and troubleshooting.
> How to Diagnose a Failing Surge Protective Device (SPD) – Step‑by‑Step Troubleshooting
SPD failed without visible damage? Learn to check status indicators, measure leakage current, and know when to replace.




