What are the types and functions of circuit breaker tripping devices?

Release time:

2021-08-18

The traditional circuit breaker protection function is at release, through the role of the mechanical system to achieve, the effect is not ideal. In order to prevent the failure and damage of electrical equipment when the power supply network is abnormal, more reliable and protective circuit breakers are gradually developed on the basis of traditional circuit breakers.

With the development of microelectronics technology and the emergence of integrated circuits, the volume of ordinary electronic circuits has been greatly reduced, so there has been a multi-function release based on ASIC, which has promoted the development of multi-function circuit breakers. At the same time, the development of microcomputer technology also provides conditions for the intelligence of low-voltage electrical appliances. The Intelligent release is the core component of the intelligent circuit breaker. It can not only provide various protection functions of ordinary circuit breakers, but also display various parameters (current, voltage, power, power factor, etc.).).) And communicate with the PC in real time.

The circuit breaker has five kinds of release

1. Thermal magnetic release

2. Electromagnetic release

3. Pressure loss release

4. Parallel excitation release

5. Electronic release

Next, the characteristics and functions of various circuit breaker tripping devices are described in detail:

1. Thermal magnetic release

The thermal magnetic release provides magnetic protection and thermal protection, I .e. overload protection. Thermal protection: the current passes through the release, the heating element heats (the direct current passes through the bimetal), and the bimetal is deformed by heat. When the deformation reaches a certain degree, the impact rod will drive the mechanism to move and cut off the circuit. Generally speaking, thermal and magnetic trippers are used to provide short-circuit and overload protection in the circuit, while electromagnetic trippers are used to provide short-circuit protection in some special occasions, and other components (such as thermal relays) provide overload protection.

2. Electromagnetic release

The electromagnetic release is connected in series with the protection circuit. When the normal current passes through the line, the electromagnetic force generated by the electromagnet is less than the pulling force of the reaction spring, the armature will not be attracted by the electromagnet, and the circuit breaker operates normally. When a short-circuit fault occurs in the line, the current exceeds several times the normal current, the electromagnetic force generated by the electromagnet is greater than the force of the reaction spring, and the armature is attracted by the electromagnet to push the free trip mechanism, and the main contact is released through the transmission mechanism. Under the action of the opening spring, the main contact respectively cuts off the circuit to play the role of short circuit protection.

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