The 3RF3380-1BA02 is a 1-pole solid-state contactor from the Siemens SIRIUS 3RF33 family, designed for AC-15 switching duty at 27.5 A at 40 °C. AC-15 is the IEC utilization category for electromagnetic loads — solenoids, contactor coils, and brake magnets — where the inrush can be several times the sealed current. The 27.5 A rating means this contactor handles the steady-state current of a bank of such loads, with solid-state switching eliminating the coil wear and arc erosion you get with a mechanical contactor in the same duty.
Control voltage and switching behavior
The control circuit accepts 24-230 V AC or 24 V DC, with instantaneous switching — no zero-cross or delayed turn-on. That matters when you need deterministic response in a safety circuit or a fast-acting interlock, but it also means the load sees the full half-cycle if switched on near the voltage peak. For inductive loads like relay coils, that's usually fine; for capacitive loads or long cable runs, you'd want to check the inrush against the contactor's surge rating.