Button switch (English Name: push-button switch) refers to the use of push button drive mechanism, the moving contact and press the switch on or off and realize the circuit switching. The button switch is a kind of simple structure, wide application of the main electrical appliances. In the automatic control circuit, a control signal to control the manual for contactor, relay, electromagnetic starter.
Many types of button switch structure can be divided into ordinary snap type, mushroom hairstyle, self-locking, self reset type, rotary handle type, indicating lamp, lamp type symbol and key etc., single button, double button, three button and different combinations is generally a cordwood structure, composed of a button cap, a reset spring, bridge contact and a shell, usually made of composite, a pair of normally closed contacts and the normally open contact, some products can be by multiple components in series to increase the contact pairs. There is a self-contained button, you can keep the closed position automatic press after the power to open.
Button switch can complete the start, stop, positive and negative, variable speed and interlock and other basic control. Normally each button switch has two pairs of contacts. Each pair of contacts is composed of a normally open contact and a normally closed contact. When you press the button, the two to contact at the same time, the normally closed contact is disconnected, normally open contacts.
In order to identify each button function, to avoid misoperation, usually the button cap made in different colors, to show the difference, the colors are red, green, black, yellow, blue, white, etc.. For example, the red stop button, green start button etc.. The main parameters, button switch type, installation hole size, contact number and contact current capacity, are detailed in the product manual.