What are the principle,types and main technical parameters of a switch?

l  Principle

The switch is the component that completes the electrical connection and disconnection through a certain action, which is generally connected in series to realize the transmission and control of signal and electric energy. The connector completes the electrical connection between two circuit boards or two parts of the circuit, so as to realize the transmission and control of the signal and the electric energy. The quality and performance of switches and connectors directly affect the reliability of electronic systems and equipment.

l  Types of switching devices

1. Types of switching devices.

The switch can be divided into two categories : manual and automatic;

1)according to the application, it can be divided into power switch, control switch, trip switch and so on;

2)according to the mechanical action, it can be divided into rotary switch, press switch, toggle switch and so on.

2. The main function of the switching device is to turn on, disconnect and convert the circuit.

l  The main technical parameters of the switch

1Rated voltage : the maximum DC voltage or AC voltage effective value that can be withstood under normal working condition.

2Rated current : the maximum direct current or AC current value that is allowed under normal operating conditions.

3)Contact resistance : a pair of contact points connected to the resistance, the general requirements of < 20mΩ.

4)Insulation resistance : the resistance between the disconnected conductive parts generally requires 100 Meg ohms.

5)Electrical strength ( pressure ) : the voltage that can be withstood between the disconnected conductive parts, the general switch requires 100V, and the power switch requires 500V.

6)Working life : the number of times used in the normal working condition, the general switch is 5000 ~ 10000 times, the high reliable switch can reach 50000 ~ 500,000 times

This article is from Allicdata Electronics.