Overview

The HUM8 series molded-case circuit breaker (hereinafter referred to as the “circuit breaker”) is applied in the network circuit of AC 50Hz, rated voltage to 690V, rated current to 1250A power system, used to distribute electric energy and power system protection against overload, short circuit, undervoltage fault, also can be used to control the infrequent operation of electric machines.

The characteristics of electronic release and intelligent release are accurate and convenient. Intelligent release has serial communication interface, which can meet the "four remote" requirements of communication networking. The full series can be equipped with unique "overload alarm without tripping" function, to ensure continuity of power supply, to meet the requirements of article 6.3.6 under GB 50054. Full range circuit breakers are available for isolation. 

It accords with the standard of GB 14048.2 and IEC 60947-2.

Normal working conditions

1. The ambient air temperature shall not be higher than +40°C or lower than -5°C.

2. Altitude ≤ 2,000 m.

3. The relative air humidity shall not exceed 50% at the maximum temperature of +40°C. A higher relative humidity is allowed at a lower temperature. The average minimum temperature of the wettest month shall not exceed +25°C, and the average maximum relative humidity of that month shall not exceed 90%.

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. The "1, 3, 5 and N1" terminals of the circuit breaker are connected to the power supply, and the "2, 4, 6 and N2" terminals are connected to the load, which cannot be reversed.

7. The installation surface of the circuit breaker shall be vertical to the horizontal plane. The circuit breaker is basically installed vertically, with the power supply end at the top and the load end at the bottom, and can also be installed horizontally.