Working principle and wiring method of miniature circuit breaker

The working principle of miniature circuit breaker

The structure of the equipment is mainly composed of operating mechanism, contacts, protection devices (including various trippers), and arc extinguishing system. The main contacts of the miniature circuit breaker need to be manually or Electric way to close. Its working principle is that when the main contact performs the closing action, the free trip mechanism will lock the main contact to the closing position.

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In addition to the standard configuration, the trip device of general miniature circuit breakers can also be selected according to the actual application requirements. If it is an overcurrent trip, the coil is connected to the main circuit in series with the thermal element of the thermal trip. In the circuit, if an undervoltage release is used, the coil needs to be connected in parallel with the power supply. When the circuit is short-circuited or a serious overload fault occurs, the armature of the overcurrent release in the miniature circuit breaker will be pulled in, and at the same time the free trip mechanism will be activated and the main contact will disconnect the main circuit.

When the circuit is overloaded, the thermal element in the thermal trip unit of the miniature circuit breaker will gradually heat up and cause the bimetallic strip to bend to a certain degree, thereby pushing the free trip mechanism to act. When the circuit is under-voltage, the under-voltage release armature of the miniature circuit breaker will be released to realize the free trip mechanism action.

Miniature circuit breaker wiring method

Here we take the DZ47-60 miniature circuit breaker under the Chint brand as an example. This equipment is usually suitable for installation and use in places such as lighting power distribution system C-type tripping curve characteristics or motor power distribution system D-type tripping curve characteristics. . Mainly used in AC 50Hz/60Hz, rated voltage up to 400V, rated current up to 60A in the circuit, small circuit breakers can play a protective role in overload, short circuit, etc., and infrequently turn on and off electrical devices and lighting under normal conditions line.

Generally, miniature circuit breakers are divided into 1P (1 pole), 2P (2 poles), 3P (3 poles), 4P (4 poles) switches, as shown in the figure below.

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1P (1 pole) miniature circuit breaker wiring method: the upper end is connected to the live wire and the lower end is connected to the live wire.

2P (2 poles) miniature circuit breaker wiring method: the left side of the upper end is connected to the live wire inlet, the left side of the lower end is connected to the live wire outlet, and the right side is connected to the neutral wire.

3P (3 pole) miniature circuit breaker wiring method: the upper end is connected to the live wire three-phase incoming wire, and the lower end is connected to the live wire three-phase outgoing wire.

4P (4-pole) miniature circuit breaker wiring method: the three on the left side of the upper end are connected to the three-phase live wire, the three on the left side of the lower end are connected to the three-phase live wire, and the right is connected to the neutral wire.

The above is the working principle and wiring method of the miniature circuit breaker, I hope to help everyone. okplazas.com is a professional agent selling circuit breaker products, welcome to e-mail: [email protected] for consultation, and you can also contact WeChat +86-13689242098 online for product consultation!