Solid State Relay – Required Only 50uA Drive Current

This circuit demands a
control current that is 100 times smaller than that needed by a typical
optically isolated solid state relays. It is ideal for battery-powered
systems. Using a combination of a high current TRIAC and a very sensitive low current SCR, the circuit can control about 600 watts of power to load while providing full isolation and transient protection.

Source: Discover Circuits

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