SSR Latching Circuit
If you don't need the isolation, why use an SSR at all? A simple two-transistor latch would be much simpler.



simulate this circuit &ndash; Schematic created using CircuitLab
If the circuit tends to power-up in the &quot;on&quot; state (and you don't want this), add a capacitor across SW2. If SW1 needs to be connected to a different voltage source, that works, too.