Overview

Push button switch is a simple structure, is widely used by the main electrical appliances. Electrical control circuits, used to manually send control signals to control the contactors, relays, solenoid starter.
Button switch of structure species many, can is divided into general press button type, and mushroom head, and since lock type, and since reset type, and spin handle type, and with led type, and with lamp symbols type and the key type,, has single button head, and double button, and three button and the different combination form, General is used blocks type structure, by button CAP, and reset spring, and bridge type touch head and shell, composition, usually made composite type, has pair often closed touch head and often opened touch head, some products can through multiple components of series increased touch head logarithmic. There is also a self-type button, pressed to the closed position automatically, after a power failure can be opened.
Push button switch can complete to start, stop, reverse, shift interlock and other basic controls. Usually that each push button switch with two pairs of contact point. Each contact consists of a normally open contact and one normally closed contact form. When the button is pressed, while two to operate, the normally closed contacts disconnect, normally open contact is closed.   
In order to indicate the function of each button, to avoid misoperation and button caps are usually made into different colors to distinguish the two, its colors are red, green, black, yellow, blue, and white. For example, red indicates the stop button, the Green Start button. Push button switches the main parameters, type, mounting hole size, number of contacts and contacts of current capacity, has a detailed description in the product manual. Commonly used domestic products LAY3, LAY6, LA20 LA25 LA38, LA101, LA115, LAY5, LAY7, and so on.

Buttons can be classified according to the operating mode, protection mode, the common button types and characteristics

(1) open-type: suitable for mounting is fixed on the switch Board and control cabinet or on the console Panel. Code-named k.

(2) protection: protective case, the buttons will prevent the internal components against mechanical damage or human touch live parts, code-named h.
(3) waterproof type: envelope sealed to prevent rainwater intrusion. Code named s.

(4) anti-corrosion type: to prevent chemical corrosive gas intrusion. Code-named f.
(5) the explosion-proof type: can be used for explosive gas and dust without causing detonation, such as coal mining and other places. Code name b.
(6)-knob:-contact rotation operation with his hand, breaking two locations, typically a panel mount. Codenamed x.
(7) key
key: operate using a key rotation prevents incorrect operation or for special operations. Code named y. (8) emergency: the big red mushroom button protrudes from the outside, as an emergency power off. Code-named j or m.
(9) the emotion buttons: button is equipped with self supporting electromagnet, mainly used in power plants, substations and equipment, the operator Exchange signals and instructions, such as, typically a panel operation. Code-named the z.
(10) the light button: button is equipped with lights, in addition to publishing operations command, doubles as a signal, usually used in control cabinets, control panels. Code named d.
(11) combined: number of button combinations. Code name e.
(12)-interlock: multiple contacts are interlocked with each other. Code for c.

Main technical parameters

Switch rating: AC-15 36V/10A 110V/10A 220V/5A 380V/2.7A 660V/1.8A

DC-6V/4A 12/4A 24V/4A 48V/4A 110V/2A 220V/1A 440V/0.6A
conventional thermal current: 1th 10A
electric shock resistance: ≤ 50m
insulation resistance: 10m ω
mechanical life: General knob n ≥ 100x10^4; Knob ≥ 30x10^4
buzzer n ≥ 5x10^4
≥ 5x10^4 emergency stop button