MCCB Molded case circuit breaker

Update date:2018-01-23 Source:MAXGE

The molded case circuit breaker can automatically cut off the current after the current exceeds the jump setting. The plastic case refers to the plastic insulator used as the enclosure of the device to insulate the conductor and the ground metal part. The molded case circuit breaker usually contains the thermal magnetic jump unit, while the large size of the molded case circuit breaker will be equipped with a solid-state skip sensor. 

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The tripping unit is divided into: thermal magnetic tripping and electronic tripping device. Commonly used, the rated current has a total of the following types: 100, 125, 160, 200, 225, 250, 315, 350, 400, 500, 630, 800A.

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The molded case circuit breaker is also known as the device circuit breaker, and all the parts are sealed in the plastic housing, auxiliary contacts, undervoltage tripping devices, and shunt tripping devices. As the structure is very compact, the molded case circuit breaker is basically unserviceable. It adopts manual operation, and it can choose electric power splice. Due to the application of electronic over-current trip, molded case circuit breaker can be divided into class A and class B, class B has good three sections of protective properties, but due to the price factor, adopts thermal class A product of the magnetic needle of the trip of A higher market share. 

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Molded case circuit breaker is to contact, arcing chamber, trip and operating mechanism has been packed in a plastic shell, generally do not consider the maintenance, applicable to the branch protection switch, overcurrent trip with thermal magnetic and electronic type two kinds, the general thermal magnetic molded case circuit breaker is a selective circuit breaker, only overload long time delay and short-circuit transient protection, electronic molded case circuit breaker with overload long time delay, short circuit the short time delay, short circuit instantaneous and ground fault protection function. The new product of partial electronic molded case circuit breaker also has regional selective interlocking function. Most of the molded case circuit breakers are operated by hand, and some have motor operators.


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