Overview

This transfer switch is suitable for the dual power supply system with AC 50 Hz, rated working voltage of 400 V (Level 3, 4) or below and rated current of 10 A to 630 A. It can simultaneously detect the two power supplies of the power supply system: The common power supply (N) and the standby power supply (R), and automatically (or manually) switch from the abnormal power supply to the normal power supply when the power supply is in undervoltage, phase loss, voltage loss, and overvoltage, so as to improve the continuity, safety and reliability of the power supply system in the place of use.

This transfer switch is widely used in power systems, hospitals, posts and telecommunications, fire control, hotels, banks, airports, docks, residential quarters, television stations, military facilities, shopping malls and other important places with high requirements for power supply continuity.

Normal working conditions

1. The ambient air temperature shall be -5°C – +40°C; and the average temperature within 24 hours shall not exceed +35°C.

2. The altitude of the installation location shall not exceed 2,000 m.

3. The relative atmospheric humidity at the installation site shall not exceed 50% when the ambient air temperature is +40°C. A higher relative humidity is allowed at a lower temperature. For example, when the average minimum temperature in the wettest month is +20°C, the monthly average maximum relative humidity can be up to 90%. Appropriate measures shall be taken to prevent condensation caused by temperature changes.

4. Contamination grade: Grade 3. There is no explosion danger and no gas or conductive dust that corrodes metals or damages insulation in the surrounding air.

5. The installation category is Grade III.

6. Two power lines are connected to the upper terminal of the switching device, and the load line is connected to the lower terminal, which cannot be reversed.

7. The installation location shall be free of significant vibration and impact.