Overview

The HUM18Z-50 series miniature DC circuit breaker is a new product developed on the basis of the HUM18-63 series high breaking miniature circuit breaker. The product is with reliable performance, high breaking ability, accurate protection and small size. It is widely used in communications, electric locomotive and other industries. Circuit breakers are mainly used in power line and power equipment with DC rated voltage of 220V/440V, rated current to 50A for over current protection, and can also be used for infrequent on-off operation.  

The product conforms to the standard: GB10963.2, IEC60898-2.

Normal working conditions

1. The upper limit of ambient air temperature is not more than +40℃, the lower limit is not less than -5℃, and the average value of 24h is not more than +35℃. 

2. Installation ≤2000m. 

3. The relative atmospheric humidity at the installation site does not exceed 50% at a maximum ambient temperature of 40℃, a higher relative humidity is allowed at a lower temperature and an average monthly maximum relative humidity is not more than 90%, while the average monthly temperature does not exceed 25℃, and the condensation on the surface of the product caused by the temperature change should be considered. 

4. Class of pollution: class 2. 

5. Installation category: II, III.