Vacuum circuit breakers and vacuum contactors are actually the same as air circuit breakers air contactors, except that the interrupting unit is placed in a vacuum environment, enhancing the adaptability of the environment, while the vacuum insulation and interrupting good performance, has been widely used.

Vacuum circuit breaker: is a kind of protection equipment, in the event of a fault in the line can automatically switch off to protect the line; at the same time can also manually switch off the load current.

Vacuum contactor: used for frequent small-current cut-off, can not say no protection, in fact, with thermal coupling, action without energy storage, relying on the magnetic absorption of the coil, can not cut off the fault current, as for the circuit breaker, it goes without saying, in the case of smaller capacity, engineering more use contactor.

The principle of action is also different, one is to open and close the normal operating current, one is to open and close the break current. The body of the circuit breaker and accessories all add up to three stages of protection and time limit.

The difference between vacuum circuit breaker and vacuum contactor

1, vacuum contactor conductive circuit is from the incoming and outgoing conductive rod vacuum circuit breaker is mainly used for opening and closing, with the ability to engage in dirt.

2, the vacuum contactor is suitable for AC 50Hz, the outer insulation is mainly through the high-voltage casing to achieve, conductive circuit, off the load current in the power line. And suitable for use in a variety of protection devices consisting of explosion-proof magnetic starter, overload current and short-circuit current, the inner insulation is composite insulation, insulation system to control frequent operation of three-phase induction motors and other devices. The circuit breaker consists of an operating mechanism for direct or remote connection and disconnection in the main circuit, rated current to 630A in the power system, seals and shell composition, rated voltage 1140V, conductive clamps and vacuum interrupter chamber connected to become. The overall structure is three-pole common box type, static and dynamic end of the conductive plate.

3、Vacuum contactor is suitable for substations and industrial and mining enterprises in the distribution system for protection and control purposes

4、The vacuum contactor is connected to the circuit breaker and the difference between the contactor and the circuit breaker is that it belongs to the control appliance, the circuit breaker is connected, it can operate frequently, overload protection, short-circuit protection function, carrying current function, he has no protection function; it belongs to the protection appliance, its allowable action frequency is low.

5, the vacuum contactor can not open short-circuit current, but also with open and normally closed contacts. And does not have the protection function of short-circuit current, it can only be separated and maintained by the given signal.

The vacuum contactor is a device that can withstand repeated operation (strong mechanical life), and can play the role of cutting off the load current, but can not play the role of short-circuit current (to remember this). Vacuum contactor with normally open and normally closed contacts, and does not have a short-circuit current protection function, can receive a given signal to perform the separation and hold action.

Vacuum circuit breaker it is a kind of equipment to play a protective role (short circuit, overload, etc.), when the fault occurred in the working line can be automatically through the closing action to complete the line protection, but also through the manual operation of the switch to cut off the load current.

Whether it is a vacuum contactor or vacuum circuit breaker, to put it bluntly, air circuit breakers and contactors compared to everyone understands, in fact, their role is basically similar. The vacuum refers to the interrupting unit is placed in a vacuum environment, the air refers to the use of air media to complete the interrupting arc. The vacuum interrupter is to increase the adaptability of the environment, but also because the vacuum insulation and interrupting performance are better than other interrupting effect, so the application of the place is generally valued for this performance requirements.

The vacuum contactor can play a role in cutting off the load current, frequent operation (starting and stopping the motor), frequent connection and breaking of larger currents, etc. In these areas, the ability is relatively strong and the rated operating voltage is relatively high, if the high-voltage environment is recommended and high-voltage vacuum circuit breaker with the use of this will be safer and more secure.

Vacuum circuit breakers can play a role in overload protection, short-circuit protection, control protection and interlocking protection, so in these aspects are relatively strong and different from vacuum contactors. In the field of high voltage is more commonly used SF6 vacuum circuit breakers, generally used in high-voltage circuits above 110kV.