The molded case circuit breaker is also known as the device circuit breaker

Update date:2017-10-27 Source:MAXGE

The molded case circuit breaker is also known as the device circuit breaker, and all parts are sealed in the plastic housing, auxiliary contacts, undervoltage tripping device and the shunt tripping device. Because the structure is very compact, the molded case circuit breaker can not be serviced. It adopts manual operation, and the large capacity can choose electric separation.

 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.Molded case circuit breakeris 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. 

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The working principle :

The main contact of the low voltage circuit breaker is operated by hand or electric switchgear. After the main contact is closed, the free trip mechanism locks the main contact lock in the lock position. The coil of the overcurrent tripping device and the thermal element of the thermal release are in series with the main circuit, and the coil of the undervoltage trip is connected in parallel with the power supply.

When the circuit is short circuited or seriously overloaded, the armature of the overcurrent tripping device is absorbed and the free tripping mechanism is made, and the main contact is disconnected from the main circuit.

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When the circuit is overloaded, the heat element of the hot detach can bend the bimetal strip and push the free trip mechanism. The main contact is disconnected from the main circuit.

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When the circuit is under voltage, the arrester of the undervoltage tripping device is released, and the free trip mechanism is made. The main contact is disconnected from the main circuit.

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When pressing the shunt button, the shunt tripping device is used to absorb the armature, so that the free trip mechanism can be removed. The main contact is disconnected from the main circuit.


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Copyright© 2017
www.maxge.com All Rights Reserved.

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