Push button switch is also called the control button (button), is a kind of manual and generally low voltage apparatus can be reset automatically. Button to send out the start or stop the instruction is usually used in the circuit, to control the electric equipment such as electromagnetic starter, contactor, relay coil current on and off.

Push button switch is a press the action, the release of the reset to connect and breaking the current circuit of electrical appliances. Generally used in ac/dc voltage up to 440 v, the control circuit of the electric current is less than 5 a, is generally not directly manipulate main circuit, can also be used to interconnect circuits.

In the course of actual use, in order to prevent wrong operation, often on the button to make a different mark or coated with different color to distinguish, its color has red, yellow, blue, white, black, green, etc. General red "stop" or "dangerous" cases of operation; Green said, "start" or "switched on". Stop button must be in red button mushroom head. Button must have a metal protective ring and ring than button cap to prevent accidental touch button and produce false action. Install button button and button box materials must be metal and connected with mechanical total grounding bus bar.

Structure principle

Push button switch has a variety of structures, can be divided into ordinary press stud type, mushroom head type, self-locking type, since the reset type, rotary type handle, with light, belt light symbols and key type, etc., have single toggle, double toggle, I button, and different combinations. Usually adopts water type structure, by the button cap, reset spring, the static and dynamic contact contactor and shells, etc, often in composite, a pair of normally closed contacts and normally open contacts, some product can through multiple components in series to increase contact logarithmic. There is a self sustaining type button is pressed, can automatically keep the closed position, after to open when the power is cut off.

The button did not press, dynamic contact and the static contact is connected, the contact is called the normally closed contacts. At this point, the dynamic contact and the static contact is disconnected, the contact is called normally open contacts: press the button, the normally closed contacts disconnect, normally open contacts closed; Loosen the button, under the action of the reset spring, restore the original working condition.