AC Input SSRs
Solid state relays with a 90–240 VAC control input. Driven by relay-output thermostats, PLC relay outputs or an existing 230 V control circuit, they replace contactors on frequently switched resistive loads.
- Series: Autonics SR1, single phase, detachable heat sink
- Current: 10 A – 75 A
- Load voltage: 24–240 VAC (SR1-42xx) or 48–480 VAC (SR1-44xx)
We recommend rating the SSR at least 1.5–2 times the load current and using a suitable heat sink.
Autonics SR1-4420 Single-Phase SSR 20A (AC Input)
Autonics SR1-4420 is a 20 A single-phase solid state relay (SSR) from the SR1 series with detachable..
Autonics SR1-4425 Single-Phase SSR 25A (AC Input)
Autonics SR1-4425 is a 25 A single-phase solid state relay (SSR) from the SR1 series with detachable..
Autonics SR1-4430 Single-Phase SSR 30A (AC Input)
Autonics SR1-4430 is a 30 A single-phase solid state relay (SSR) from the SR1 series with detachable..
Autonics SR1-4440 Single-Phase SSR 40A (AC Input)
Autonics SR1-4440 is a 40 A single-phase solid state relay (SSR) from the SR1 series with detachable..
Autonics SR1-4450 Single-Phase SSR 50A (AC Input)
Autonics SR1-4450 is a 50 A single-phase solid state relay (SSR) from the SR1 series with detachable..
Autonics SR1-4475 Single-Phase SSR 75A (AC Input)
Autonics SR1-4475 is a 75 A single-phase solid state relay (SSR) from the SR1 series with detachable..

