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Connection Diagrams of SSR


SSR or Solid State Relay or Electronic Relay replace Electromagnetic Relays in some applications. The connection diagrams are shown here. They are faster and have no moving parts. 

Continental Industries - Solid State Relays

Connection Diagram of AC Control SSR

Connection Diagram of SSR AC 230 Control / 230V AC N.O.

This is a Thyristor Based Normally Open 230V Switch that can be turned on / off at a fast rate. This switches at Zero Crossover .Built In Snubber reduces EMI and protects the SSR. USE SAME PHASE FOR I/P & O/P.

  • No moving parts hence no wear and tear.
  • Dissipates Heat when in On Condition.
  • Use adequate Heat Sink or SSR will fail. ( 10g / Amp)
  • Dissipation is 1.5 Watts per Amp thru Load.
  • Input to Output is optically isolated 2kV.
  • This one is AC 230V Control AC 230V N.O. Output.
  • Off state snubber Leakage is around 5 mA.


AC-AC SSR Wiring

Notes -

The Termination's of High Current Lines going to Load must be very tight and crimped. Loose contacts will Spark and cause Fire.

Web Enabled 4-20 mA Input Controller

Fuse Rating of HRC Fuse - High Rupture Capacity (HRC) Fuse is Safe and Reliable. 5kW Heater at 230V is 5,000 / 230 in Amps of Fuse Rating.

Connection Diagram of SSR DC 3-30 Control / 230V AC N.O.

Use 12V DC for Best Results. This one is DC 3-30 Control AC 230V N.O. Output. Rest same as above.

DC-AC SSR Wiring


Connection Diagram of DC PCB SSR

Diagram of SSR 5000 DC 3-30 Control / 230V AC N.O  3A.

This is a Thyristor Based Normally Open 230V Switch that can be turned on / off at a fast rate. This switches at Zero Crossover . Use 5V DC for Best Results.

  • No moving parts hence no wear and tear.
  • Dissipates Heat when in On Condition 5 Watts @ 3 Amps.
  • Mount with adequate Air Ventilation for 3 Amps.
  • Dissipation is 1.4 Watts per Amp thru Load.
  • Input to Output is optically isolated 1kV.
  • This one is DC 3-30 Control AC 230V N.O. Output.
  • Off state snubber Leakage is around 1 mA.

Three Phase AC SSR for 1 HP Motor

PCB SSR Wiring

Notes -

The Termination's of High Current Lines going to Load must be very tight and crimped. Loose contacts will Spark and cause Fire.

Fast Blow Fuse is to be used. Use a 2 Amps Fuse with Holder in the Hot Line

Read More - Solid State Relays SSR.