Compliant Standards
● GB/T 14048.1 General rules
● GB/T 14048.2 Circuit-breakers
● IEC 60947-1 General rules
● IEC 60947-2 Circuit-breakers
Pollution Degree
● CDM6i series products operate in
Pollution Degree 3 environments as defined by standards IEC 60947-1 and IEC 60664-1 (industrial environments).
Resistance to Damp Heat
● Dry cold, dry heat, damp heat
Ambient Temperature
● Upper limit of surrounding air temperature: +70°C; Lower limit: -40°C; 24h average temperature not exceeding 35°C. (Note: For use between -40°C ~ -25°C and +40°C ~ +70°C, refer to the derating coefficient table.)
● Storage temperature: -40°C to +70°C.
Altitude
● Normal operating installation altitude does not exceed 2000m.
● If installation is required above 2000m, changes in dielectric strength and the decrease in air cooling capacity must be considered. Refer to the altitude derating coefficient table for use.
Humidity
Normal operation requires:
● Relative humidity not exceeding 50% at a surrounding air temperature of +40°C.
● Higher relative humidity is permissible at lower temperatures.
● Monthly average relative humidity of the wettest month: 90%.
● The impact of condensation forming on the product surface on product performance must be considered.
Reliable Contact Indication with Isolation Function
● CDM6i series molded case circuit breakers comply with the isolation requirements defined in IEC standard 60947-2.
● The isolation position corresponds to the "0" (OFF) position.
● The operating handle can only indicate the "OFF" position when the contacts are physically open.
● The reliability of the contact indication system is not affected by the use of a rotary handle or electrical operating mechanism.
● Tests for the isolation function must ensure:
● Mechanical reliability of the contact indication system.
● Absence of leakage current.
● Sufficient overvoltage withstand capability exists between the line and load terminals.
Protection Class (IP Rating)
● Circuit breaker body: IP20.
Circuit breaker installed in a switchgear cabinet:
● With toggle handle: IP40.
● With electrical operating mechanism: IP40.