Details

Optically isolated input of 5-12V DC controls AC output between 100-300V AC at 12 Amp

The output acts like a switch ON or OFF depends on control voltage at input.

Block Diagram of SSR

  Solid state relay works like a normal relay. Those are usually called also with short name SSR. An SSR is a semiconductor device that can be used in place of a mechanical relay to switch electricity to a load in many applications. Solid-state relays are purely electronic, normally composed of a low current control side (equivalent to the coil on an electromechanical relay) and a high-current load side (equivalent to the contact on a conventional relay). SSRs typically also feature electrical isolation to several thousand volts between the control and load sides. Because of this isolation, the load side of the relay is actually powered by the switched line; both line voltage and a load (not to mention a control signal) must be present for the relay to operate.  

Benefits of SSR relays

• No mechanical moving parts
• No arching in contacts
• No contact materials which will wear out in frequent use
• No inductors on control side
• No contact bounce
• No acoustical noise
• No arching or sparking
• No EMI from contact commutation
• High switching speed
• High reliability
• Long operating life
• Resistant to shock and vibration
• Wide input voltage range possible (same relay can take wire range of control voltages without problems if built so)
• Possible to always turn on and off only at zero phase
• High input-output isolation