Light isolated solid state power relay circuits

Posted on Nov 12, 2012

Both circuits use the GE. SC146B, 200 V, 10 A Triac as load current contacts. These triacs are triggered by normal SBS (2N4992) trigger circuits, which are controlled by the photo-Darlington, acting through the DA806 bridge as an ac photo switch. To operate the relays at other line voltages the asterisked (*) components are scaled to supply identical current

Light isolated solid state power relay circuits
Click here to download the full size of the above Circuit.

Ratings must be changed as required. Incandescent lamps may be used in place of the light emitting diodes, if desired.

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