Introduction to the Characteristics and Functions of Key Switches
Release time：2019-08-19 Clicks： Click
What are the characteristics of key switches and what role do these characteristics play? Let's talk about it today.
Today, this article will introduce the characteristics of key switch, the principle of metal key switch and the connection mode.
The key switch refers to the switch that uses the key to push the transmission mechanism to open or close the moving contact and the static contact and realize the circuit switching. The key switch is a basic order electrical equipment with simple structure and wide application. In the automatic control circuit, it is used to send control signals manually to control contactors, relays, electromagnetic starters, etc. Next, we will introduce some features of key switches and metal key switches.
The characteristics of key switch:
Rated value: generally refers to the value used as the guarantee reference for switching characteristics and performance, such as rated current, rated voltage and so on. Its premise is specific conditions (load type, current, voltage, frequency, etc.).
(2) Operating mode (self-locking/unlock): After pressing the handle, the switch will have a locking action called self-locking, and the unlocked action is called unlock.
(3) Insulation resistance: refers to the value of resistance between non-connected terminals, between terminals and non-charged metal parts, between terminals and ground.
(4) Voltage withstanding: The key switch manufacturer will not cause the critical value of insulation damage after adding 1 minute high voltage to the prescribed measuring position.
Contact resistance: It represents the resistance of the contact part of the contact point, but generally represents the resistance value of the conductor resistance including the spring and terminal part.
Vibration resistance: When using the wrong-acting vibration key switch, the vibration closed contacts are not separated in the vibration range within the prescribed time.
Impact resistance: The durable impact finger key switch will not be damaged by various parts of the mechanical impact during transportation or installation, and meet the impact within the range of action characteristics. Misoperation impact refers to the impact range of the closed contact when the key switch is used because of the impact within a specified time.