Overview

The H8A Series Intelligent Universal Circuit Breaker (hereinafter referred to as “circuit breaker”) is suitable for distribution networks with AC 50 Hz, rated working voltage of 400 V and 690 V and rated current up to 6,300 A, and is mainly used for power distribution, power feeding and power generation protection, so as to protect circuits and power equipment from faults such as overload, undervoltage, overvoltage, current voltage unbalance, short circuit and grounding fault. The core components of circuit breakers adopt intelligent controllers, which can realize accurate selective protection, so as to avoid unnecessary blackout and enhance the reliability, continuity and safety of power supply.

The circuit breaker series can be compatible with top-in or bottom-in incoming lines.

The standard followed: GB/T 14048.2 Low-voltage Switchgear and Control gear Part 2: Circuit Breakers

Normal working conditions

1. Normal working conditions

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

Note: If the upper limit exceeds +40°C or the lower limit is lower than -5°C, the user shall consult with the manufacturer.

b) The altitude of the installation location shall not exceed 2,000 meters.

Note: If the circuit breaker is used at an altitude above 2,000 meters, the user shall consult with the manufacturer.

c) The relative atmospheric humidity does not exceed 50% when the ambient air temperature is +40°C, and a higher relative humidity is allowed at a lower temperature. For example, the average maximum relative humidity in the wettest month is 90%, and the average minimum temperature in this month is +20°C. Measures shall be taken to deal with the occasional condensation due to temperature changes.

d) The contamination grade is Grade 3.

e) The installation category of the main circuit of the circuit breaker is IV. When the rated working voltage of the main circuit is not greater than AC 400 V, the installation categories of the control circuit and the auxiliary circuit are III except that the undervoltage release coil and the primary coil of power transformer of the intelligent controller are the same as the circuit breaker. When the rated working voltage of the main circuit ranges from AC 400 V to AC 690 V, the control circuit and the auxiliary circuit need to be isolated from the main circuit by the transformer. Also, the maximum working voltage of the control circuit and the auxiliary circuit is AC 400 V, and the installation categories of the control circuit and the auxiliary circuit are both III.

f) The circuit breaker is suitable for electromagnetic environment A.

2. Normal installation conditions

a) Installation of the circuit breaker: Place the circuit breaker in the distribution cabinet and fasten it with 4 M8 (1,600 A shell frame) or M10 (2,500 A+ shell frame) bolts and gaskets. The circuit breaker shall be installed smoothly without additional mechanical stress, so as to avoid damage to the circuit breaker or poor contact of the main busbar.

b) The circuit breaker shall be installed in places where there is no explosion hazard, conductive dust, metal corrosion, or insulation damage.

c) The protection rating is IP20. When the circuit breaker is installed in the cabinet and the door frame is installed, the protection rating can reach IP40.

3. Normal storage and transportation conditions

a) The lower temperature limit shall be not less than -25°C, and the upper temperature limit shall not be more than +55°C; the relative humidity (at +25°C) shall not exceed 95%.

b) The product shall be handled with care during transportation, and shall not be turned upside down or rolled to avoid violent collision.