CHM1 Series Molded Case Circuit Breakers Are Suitable For -5°C To 40°C

The CHM1 series enclosure-type circuit breaker (hereinafter referred to as the circuit breaker) is a new type of circuit breaker developed using our company's manufacturing technology. This high-performance low-voltage protection device features a high-quality engineering plastic housing and a modular design. It features a compact structure, high breaking capacity, and precise protection. It provides comprehensive protection against overload and short circuits, and is available with a wide range of optional accessories. It is widely used in building power distribution, industrial control, and motor protection.

Product Features:
Standards Compliant
GB/T14048.1 General
GB/T14048.2 Circuit Breakers
IEC 60947-1 General
IEC 60947-2 Circuit Breakers

Ambient Temperature
The series can operate for extended periods within normal ambient and operating temperatures between -5°C and 40°C.
For operating temperatures exceeding 40°C (over 60°C for motor protection), derating should be applied or contact us.
Storage temperature range: -20°C to 70°C.

Altitude
·The normal operating installation altitude must not exceed 2000m.
·If installation is required at an altitude exceeding 2000m, changes in dielectric strength and decreases in air temperature must be considered. Refer to the altitude derating factor table.

Protection Degree
·The circuit breaker body has an IP protection rating of IP20.
·Circuit breakers installed in switchgear:
Circuit breakers with toggle handles: IP40
Circuit breakers with electric operating mechanisms: IP40

Pollution Degree
The product operates in pollution degree 3 environments (industrial environments) as defined in IEC 60947-1 and 60664-1.

Humidity
During normal operation, the product must meet the following requirements:
·At an ambient air temperature of +40°C, the relative humidity must not exceed 50%. Higher relative humidity conditions are acceptable at lower temperatures.
·The average relative humidity in the wettest month is 90%.
·The impact of condensation on the product surface on product performance must be considered.

Reliable contact indication with isolation function
· All molded case circuit breakers in this series comply with the isolation requirements defined in IEC standard 60947-2.
· The isolation position corresponds to the O (OFF) position.
· The operating handle indicates the "OFF" position only when the contacts are actually open.
· Rotating the handle or electric operating mechanism does not alter the reliability of the contact indication system. After testing, the Isolation function must ensure:
· Mechanical reliability of the contact indication system
· No leakage current
· A certain overvoltage withstand capability between the input and output terminals.