Overview

The HUM18-40/1N series miniature circuit breakers (hereinafter referred to as the “circuit breaker”) are mainly suitable for power line facilities and electrical equipment of 50Hz, rated voltage 230V, rated working current to 40A buildings and similar places for over current protection, it also can be used for infrequent on-off operation.

The products conform to the standard GB10963.1 and IEC60898-1.

Normal working conditions

1. The maximum ambient temperature should be-50℃≤T≤ +40℃, average temperature should be≤35℃ at 24h. 

2. installation altitude ≤ 2000m. 

3. The relative humidity should not exceed 50% at 40℃, it permits higher relative humidity when at a higher temperature, for example, it can be 90% at 20℃. And it should take consideration of the condensation on the product's surface for temperature change. 

4. Pollution degree: degree 2. 

5. Installation type: II, II.

6. The circuit breaker adopts installation by TH35-7.5 standard rail. 

7. The miniature circuit breaker is upright installation, knob upwards is switch on position 

8. No obvious shake and impact in mounting site.