Solid state relay advantage compare with Electromagnetic relay1 , Totally silent operation.
2 , SSR switch faster than electromechanical relays; the switching time of a typical optically coupled SSR is dependent on the time needed to power the LED on and off - of the order of microseconds to milliseconds.
3 , Increased lifetime, even if it is activated many times, as there are no moving parts to wear and no contacts to pit or build up carbon.
4 , Output resistance remains constant regardless of amount of use.
5 , Clean, bounceless operation.
6 , No sparking, allows it to be used in explosive environments, where it is critical that no spark is generated during switching.
7 , Much less sensitive to storage and operating environment factors such as mechanical shock, vibration, humidity, and external magnetic fields.