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AC Current
Controlled Relay schematic
Self powered solid state relay switches on when the AC current through the
sensing loop exceeds the preset limit. The trip point is adjustable
in the circuit as shown from about 40 to 150 watts of load current and
consumes only about 50mW. Sensitivity can be adjusted by changing
the number of turns on the sense winding (Here set to 5). Safety
isolation is intrinsic to the design. Any SSR with an LED control
input will work with this circuit, the one chosen here has a 60V-AC/DC
contact function rated for 400mA maximum. |
