Ayaa Ahmed
from Egypt
Ask
How does a solid state relay work
Answer
A solid state relay (SSR) is an electronic device to switch the electrical current, rather than an electromechanical device.
An electromechanical relay uses a magnetic coil and mechanical contacts. When current flows through the coil, it pulls down a piece of iron called an armature, causing the mechanical contacts to touch and thus close an electrical circuit.
A solid state relay has no mechanical moving parts, but instead uses a three terminal device such as a triac (triode AC), back-to-back tyristors, or FET (field effect transistor) to conduct the electrical current. When the third terminal (gate) is energized by the control input, the device conducts.
Essentially the solid state relay controls a larger electrical current by accepting a small control signal. There are no moving parts.
Advantages of solid state relays are: they have no internal arcing or contacts to wear out, can last virtually forever, can have extremely low control input requirements, and are immune to vibration or G-force chatter
-------------------------------------
No comments:
Post a Comment