The main advantage of solid state interface relays over conventional electro-mechanical interface relays is that they have no moving parts to wear out, and therefore no contact bounce issues. Solid state Interface relays are able to switch both “ON” and “OFF” much faster than a mechanical relays armature can move, as well as zero voltage turn-on and zero current turn-off eliminating electrical noise and transients. For more information about solid state relays,
Solid state interface relays are available in a range of package options, ranging from just a few volts or amperes to many hundreds of volts and amperes of output switching capability. A small input voltage, typically 3 to 32 volts DC, can be used to control a much large output voltage or current.