What is a button switch?
Button switch, also known as control button (button for short), is a low-voltage electrical appliance that can be manually and generally reset automatically. Buttons are usually used in circuits to issue start or stop instructions to control the on and off of electrical coil currents such as electromagnetic starters, contactors, and relays.
The button switch is an electrical appliance that is used to switch on and off small current circuits that is pressed to act, and released to reset. Generally used in control circuits with AC and DC voltages below 440V and currents less than 5A. Generally, the main circuit is not directly manipulated, and it can also be used in interconnecting circuits.
In actual use, in order to prevent misoperation, buttons are usually marked or painted in different colors to distinguish them. The colors are red, yellow, blue, white, black, green, etc. Generally, red means “stop” or “dangerous” operation; green means “start” or “on”. The emergency stop button must be a red mushroom button. The button must have a metal protective retaining ring, and the retaining ring should be higher than the button cap to prevent accidental operation of the button. The material of the button board and button box where the button is installed must be metal and connected to the main ground bus of the machine.
There are many types of button switches, which can be divided into common snap button type, mushroom head type, self-locking type, self-resetting type, rotary handle type, indicator type, illuminated symbol type and key type, etc., including single button, double Button, i button and different combinations. Generally, it adopts a water accumulation structure, which is composed of a button cap, a return spring, a static contact, a moving contact and a shell. It is usually made into a composite type. There are a pair of normally closed contacts and normally open contacts. Some products can pass The series connection of multiple elements increases the number of contact pairs. There is also a self-holding button, which automatically maintains the closed position after being pressed, and can only be opened after power failure.
When the button is not pressed, the moving contact is connected to the static contact above, and this pair of contacts is called a normally closed contact. At this time, the moving contact is disconnected from the static contact below. This pair of contacts are called normally open contacts: press the button, the normally closed contact is disconnected, and the normally open contact is closed; release the button, Restore the original working state under the action of the return spring
The function of the button switch:
The main electrical appliance used to reflect the stroke position of the working machine and issue instructions to control its movement direction and stroke size. If the stroke switch is installed at the end of the stroke of the working machine to limit its stroke, it is called a limit switch or terminal switch.
The knife switch is mainly used for making and breaking circuits without load. It can also be used for making and breaking small operating currents, as a power switch for infrequent operations of lighting equipment and small motors. It can also be used as a power isolation switch. It is obvious when overhauling the circuit. The disconnection point of this is something other switches cannot do.
Post time: Jul-27-2020