What are static contacts and moving contacts? What is a static contact?

Switches, relays, etc., are generally fixed in a pair of contacts used to break circuits, which is called static contacts; The other movable one is called a moving contact.

Static contacts are mainly used in high-voltage switchgear.

, there is no medium pressure in the low royal match.

The static contacts are installed in the contact box of the switch cabinet, 6 in one switch cabinet, and 2 in each of the ABC three-phase and one-phase. A high voltage of electricity.

Connected through the circuit breaker, it is similar to the air opening principle we usually use, take phase A as an example, the power supply passes through phase A busbar - circuit breaker Zhenshan phase A phase up - phase A down, and then go out.

There are 2 moving contacts on the circuit breaker of ABC three-phase, and the moving contacts and static contacts are the same as the pen and pen we use, just sold and inserted, but the insertion distance is greater than or equal to 15mm.

What is not through is normally open, and what is normally closed is through. But which is the moving and static contact, you have to measure the state when it is not moving, and then compare the state when it is moving. Most of them are normally open when they are not moving, and they are closed after operation.

It is impossible to distinguish between dynamic and static contacts with a multimeter, because each contact contact is composed of two types of contacts, dynamic and static, which are integrated in the circuit.

Friend, you just need to see that the contact is stationary. It is the moving contact that will break and close with the armature of the AC contactor.

When the contactor is not energized, the one who passes is normally closed contact, and the one who is not connected is normally open contact

There is a spring blade is a moving contact, and when energized, it will move a moving contact

Electrical contact refers to the part between two conductors or several conductors that are in contact with each other, and can be divided into three categories: breakable contact, sliding contact and fixed contact according to the structure and working characteristics. The performance of the electrical contact directly determines the quality of the switching appliance, and the basic requirements are:

1.Reliable construction.

2.The contact resistance is small and stable.

3.The heat is stable when passing through the specified current and does not exceed the thermal stability of 4When passing through short-circuit current, it has sufficient dynamic and thermal stability5

When the switch is specified in the short-circuit current, the contact does not burn. No fusion welding self-cleaning effect: refers to the contact thermal stability is good, not easy to be burned by the arc, even if it is slightly burned, it can be automatically recovered through its own physical structure, such as friction when the dynamic and static contacts are relative to each other, it will wipe off the burned surface, and play a self-cleaning role.

Electrical contacts are widely used in relays, contactors, load switches, medium and low voltage circuit breakers, household appliances, automotive appliances (horns, lights, ignition) and other switching appliances of the leading electrical contact material. Switching appliances are widely used in the analysis of voltage and current in closed circuits, and their reliability directly affects the reliable operation of the entire power system, and the electric contact is one of the important components of switching appliances. Contact products are the "heart" of these products.

According to the structure and working characteristics, electrical contacts can be divided into three categories: breakable contacts, sliding contacts and fixed contacts.