How to use the rocker switch correctly

How to use the rocker switch correctly

The rocker switch refers to a switch that uses a rocker to push the transmission mechanism to make the moving contact and the static contact press on or off and realize the circuit switching. The rocker switch is a master electrical appliance with a simple structure and a wide range of applications. In electrical automatic control circuits, it is used to manually send control signals to control contactors, relays, electromagnetic starters,
basic introduction
The rocker switch, also known as the control button (referred to as the button), is a low-voltage electrical appliance that can be manually reset and generally automatically reset. Buttons are usually used in circuits to issue start or stop commands to control the on and off of electric coil currents such as electromagnetic starters, contactors, and relays.
The rocker switch is an electrical appliance that is used to turn on and off small current circuits, which is pressed to act and released to reset. It is generally used in control circuits with AC and DC voltages below 440V and currents less than 5A. Generally, it does not directly control the main circuit, but can also be used in interconnected circuits.
In actual use, in order to prevent misoperation, different marks are usually made on the joystick or painted with different colors to distinguish them. The colors are red, yellow, blue, white, black, green, etc. Generally, red indicates operation in a "stop" or "dangerous" situation; green indicates "start" or "connect". The emergency stop button must use a red mushroom head button. The button must have a metal protective retaining ring, and the retaining ring should be higher than the button cap to prevent accidental touch of the button and cause malfunction. The material of the button plate and button box where the button is installed must be metal and connected to the general ground bus bar of the machine.
Structural principle
There are many types of rocker switch structures, which can be divided into ordinary push button type, mushroom head type, self-locking type, self-resetting type, rotary handle type, indicator light type, light symbol type and key type, etc. There are single button, Double button, i button and different combinations. Generally, it adopts a water-retaining structure, which is composed of a button cap, a return spring, a static contact, a moving contact and a casing, etc., and is usually made into a composite type, with a pair of normally closed contacts and normally open contacts. Some products can pass through The series connection of multiple elements increases the number of contact pairs. There is also a self-holding button that automatically holds the closed position after being pressed, and can only be opened when the power is turned off.
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, and this pair of contacts is called a normally open contact: press the button, the normally closed contact is disconnected, and the normally open contact is closed; Return to the original working state under the action of the return spring.
Maintenance
Buttons should be checked frequently to remove dirt from them. Due to the small distance between the contacts of the rocker, after many years of use or when the seal is not good, dust or various stages of oil emulsion will flow in, which will cause insulation reduction or even a short circuit accident. In this case, insulation and cleaning must be carried out, and corresponding sealing measures must be taken.
When the rocker switch is used in a high-temperature environment, it is easy to deform and age the plastic, resulting in loosening of the rocker switch and causing a short circuit between the wiring screws. According to the situation, a fastening ring can be added to tighten it during installation, and an insulating plastic tube can also be added to the wiring screw to prevent loosening.
The rocker switch with indicator light will heat up the bulb, which will easily deform the plastic lampshade for a long time and make it difficult to replace the bulb. Therefore, it is not suitable to be used in places where the power-on time is long; if you want to use it, you can properly reduce the voltage of the bulb to prolong its service life.
If poor contact is found, the cause should be found out: if the contact surface is damaged, it can be repaired with a fine file; if there is dirt or soot on the contact surface, it should be wiped clean with a clean cotton cloth dipped in solvent; It should be replaced; if the contact is severely burned, the product should be replaced.