The Siemens 3RF3320-1AA44 is a 1-pole SIRIUS 3RF33 solid-state contactor rated for AC-1 resistive loads at 20 A and 40 °C, with a load voltage range of 48-460 V and a 4-30 V DC control input via screw terminals. Solid-state switching means zero arcing and no coil wear — it's sized for frequent on-off cycling of resistive heaters, lighting banks, or transformer primaries where mechanical contactor life would be the limit.
RoHS compliance is confirmed from 15 January 2024 onward, and REACH Article 33 disclosure notes lead (CAS 7439-92-1) above 0.1% w/w in the candidate list — factor that into any substance-restricted line documentation.
The 48-460 V load range covers common single-phase line voltages. The 4-30 V DC control input is a wide pick-up range that works with standard 24 VDC PLC outputs or lower-voltage logic signals, but verify the minimum hold voltage at your ambient if running near the 4 V floor. Screw terminals simplify panel wiring — no special tooling needed for the control and load connections, and the 1-pole form factor fits a standard DIN-rail footprint alongside other SIRIUS control gear.