How To Build A Solid State Relay Circuit - Ssr Circuit Diagram

A solid state relay abbreviated as SSR, is a device used for switching high power AC loads through a very small input current. For example a typical SSR would switch a load at mains AC levels at power up to 500 watts in response to input triggers which may be less than 100 uA in magnitude or even less and at voltages less than 10 volts or so.

Here we will discuss how to build a solid state relay circuit.
You will require the following parts for making it:

R1 = 100 K,
R2 = 610K,
R3 = 1K2,

= 390 K,
R5 = 750 K,
R6 = 100 Ohms 1 W,
C1 = 100 uF / 25 V,
C2 = 674 / 400 V Metalized Polyester
Z1 = 35 volts, 1 W,
T1, T2 = BC 547 B,
T3 = BC 557 B,
TR1 = C 106,
OP1 = TIL 111 or similar.

dir="ltr" style="text-align: left;" trbidi="on"> Are you looking for a custom built circuit for a specific application, feel free to post it in the HERE

The circuit can be built with the following steps:

Cut a piece of veroboard into size,
Begin the assembly process by first fixing the transistors with spacing as described in the diagram.
Next, start soldering the resistors and interconnect their leads with the transistors as specified in the diagram.
Also fix the opto coupler and the triac with the help of the diagram.
Once everything is put into place, it’s time to test the unit by applying the required AC input to the load and the DC input to the trigger.
The load should get triggered in response to the DC inputs as proposed.

Article Written By Swagatam

Swagatam is a blogger at

Last updated on 26-07-2016 767 0

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