HKel Electrical Appliances (Shanghai) Co., Ltd. is a professional low-voltage electrical appliances OEM licensing production and sales as one of the enterprises. Hangkai Professional Molded Case Circuit Breaker Manufacturer, mainly produces HKM1 Molded Case Circuit Breaker, HKM3 Molded Case Circuit Breaker, providing product maintenance, type selection, knowledge and other services. Tel: 021-57161889
MoreClassification of Molded Case Circuit Breakers:
At present, Hangkai Electric Appliances (Shanghai) Co., Ltd. produces three types of plastic shell vacuum circuit breakers: distribution type, motor protection type, household and similar places.
1. Distribution type plastic case circuit breaker, which is mainly used for overload and short circuit protection of low voltage lines, typical products are HSM1 series, TO, TG series, CM1, TM30 series, etc. The standard is GB14048.2 (or IEC947-2).
2. Molded case circuit breaker with motor protection is used for overload and short-circuit protection of motors. It has motor protection type in (1) type, DZ35 series for small capacity motor protection, etc. It meets the standards of GB14048.2 and GB14048.4.
3. Plastic case circuit breakers for household and similar places, including C45N, PX200C and other plastic case circuit breakers, meet the standard of GB10963 (or IEC898). Because the use place and the load are different, they have their own overload and short-circuit characteristics, which can not be confused. In particular, it should be noted that some users often use the distribution type to protect motors, which is not appropriate.
2. Main parameters of plastic case circuit breaker:
A. Rated operating voltage (Ue) of plastic case circuit breaker:
This is the voltage at which the circuit breaker operates under normal (uninterrupted) conditions.
B. Rated Current of Molded Case Circuit Breaker (In):
This is the maximum current that a circuit breaker equipped with a special over-current trip relay can withstand indefinitely at the ambient temperature specified by the manufacturer and will not exceed the temperature limit specified by the current-withstanding component.
C. Setting value of tripping current of short circuit relay of plastic case circuit breaker (Im):
Short circuit trip relay (instantaneous or short delay) is used to make plastic case circuit breaker trip quickly when high fault current value appears.
D. Trip limit Im of plastic case circuit breaker:
Rated short-circuit breaking capacity (Icu or Icn): The rated short-circuit breaking current of plastic case circuit breaker is the highest (expected) current value that the circuit breaker can break without being damaged. The current value provided in the standard is the root mean square value of the AC component of the fault current. When calculating the standard value, the DC transient component (always occurring in the worst case of short circuit) is assumed to be zero. Industrial circuit breaker rating (Icu) and household circuit breaker rating (Icn) are usually given in the form of kA RMS.
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