What is the difference between a vacuum circuit breaker and a vacuum contactor?

1. Introduction of vacuum circuit breaker:

The vacuum circuit breaker and vacuum contactor are actually the same as the air contactor of the air circuit breaker, except that the arc extinguishing unit is placed in a vacuum environment, which enhances the adaptability to the environment. At the same time, due to the vacuum insulation and arc extinguishing It has good performance and has been widely used.

Vacuum circuit breaker: It is a kind of protection device, which can be automatically opened to protect the circuit when the line fails; at the same time, it can also be manually opened to cut off the load current.

The contactor is used for frequent small current disconnection. It cannot be said that there is no protection. In fact, it has a thermocouple, and the action has no energy storage. It relies on the magnetic attraction of the coil and cannot cut off the fault current. As for the circuit breaker, there is no need to say more. In the case of relatively small capacity, more contactors are used in the project.

The principle of action is also different.

One is to open and close the normal working current, and the other is to open and close the circuit current.

The body and accessories of the circuit breaker are all added together to achieve three-stage protection and time limit

2. Introduction of vacuum contactor:

1. The conductive circuit of the vacuum contactor is mainly used for breaking the vacuum circuit breaker by the conductive rod of the incoming and outgoing lines, and has the ability to cause pollution.

2. The vacuum contactor is suitable for AC 50Hz. The external insulation is mainly realized by the high-voltage bushing, conducting the circuit and closing the load current in the power line. It is suitable for use in explosion-proof magnetic starters composed of various protection devices, overload current and short-circuit current, and the internal insulation is composite insulation and insulation system to control frequently operated three-phase induction motors and other devices. The circuit breaker is composed of an operating mechanism for directly or remotely connecting and breaking the main circuit, a power system with a rated current of up to 630A, a seal and a shell, a rated voltage of 1140V, and a conductive clip connected to a vacuum interrupter. become. The overall structure is a three-pole common box type, a conductive plate at the dynamic and static ends.

3. The vacuum contactor is suitable for protection and control in the power distribution system of substations and industrial and mining enterprises;

4. The difference between the vacuum contactor and the circuit breaker is that it belongs to the control electrical appliance, and the circuit breaker is connected, which can operate frequently, overload protection, short-circuit protection, and current-carrying function, but it has no protection function; it belongs to To protect electrical appliances, it allows lower operating frequency.

5. Vacuum contactor: It is a device with repeated operation, which can cut off the load current and cannot break the short-circuit current, and also has open and normally closed contacts. And it does not have the protective effect of short-circuit current, it can only be separated and maintained by a given signal.