Overview

The H8M Series Molded Case Circuit Breaker (hereinafter referred to as “circuit breaker”) is the high-tech product in the 21st century. This product is characterized by advanced design, reliable performance, high technical indicators, beautiful appearance, and small size.

This circuit breaker is suitable for the power system with AC 50 Hz, rated isolation voltage up to 800 V, rated working voltage up to 690 V and rated current up to 800 A. It is used to distribute electric energy and protect circuits and power supply equipment from overload, short circuit, undervoltage and other faults, and to prevent the infrequent operation of the motor.

The product complies with GB/T 14048.2-2008 Low-voltage Switchgear and Controlgear — Part 2: Circuit-breakers and IEC 60947-2 Low-voltage Switchgear and Controlgear — Part 2:  Low-voltage Circuit Breakers, etc.

Normal working conditions

The circuit breaker is suitable for the following working conditions:

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

b. Altitude ≤ 2,000 m.

c. 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%.

d. 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.

e. The installation category is Grade III.

f. 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.

g. 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.