A brief introduction to low voltage circuit breakers

Update date:2017-12-07 Source:MAXGE


Display: about low voltage circuit breaker are briefly introduced components is introduced: the low voltage circuit breaker is also called automatic switch, he is a kind of both the manual switch function, and can automatically pressure loss, under-voltage, overload and short circuit protection of electrical appliances. He is used to allocate electricity, not frequent start motor, for the power line and motor protection, when such as overload, short circuit and under-voltage fault cut off the circuit automatically when the function is equal to the knife switch, fuse and the combination of thermal relay. Moreover, the parts should not be replaced after breaking the current. 


The low voltage circuit breaker has the single pole, double pole, three pole and four poles, which can be used for power supply circuit, lighting circuit, power circuit and the protection of the main circuit. Principle of structure: the main contact of 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.


When the circuit is overloaded, the heat element of the thermostat causes the bimetal to bend and move the free trip mechanism. When the circuit is under voltage, the arrester of the undervoltage release is released, and the free trip mechanism is also made. Shunt tripping device for remote control, in normal work, the coil is power, the need to distance control, press the button, the coil current and armature lead free trip mechanism, make the main off contact.

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