The Siemens 3RF3380-1BA24 is a 1-pole SIRIUS 3RF33 solid-state contactor rated for AC-15 duty at 27.5 A at 40 °C. AC-15 is the switching category for electromagnetic loads — solenoids, contactor coils, clutches — where inrush current can be several times the holding current. The 27.5 A rating at 40 °C means it handles that inrush without derating in a standard 40 °C panel environment; push ambient higher and you need to leave headroom. Load voltage range is 48-460 V AC, control voltage 110-230 V AC, with instantaneous switching — no zero-cross turn-on delay, so it fires immediately on the control signal. Screw terminals for the power and control wiring.
Panel and deployment context
Mounts on DIN rail in a standard enclosure. The 1-pole form factor means it switches one phase; for three-phase motor loads you stack three units or use a 3-pole variant. Instantaneous switching makes it suitable for applications where zero-cross delay is unacceptable — fast cycling of small inductive loads, or where the load must energize immediately on the control signal. The 27.5 A AC-15 rating covers most pilot-duty and small solenoid loads in a control panel; for resistive heating or motor starting you would need the AC-1 or AC-51 rating, which this part does not list.
Cross-reference codes
Group Code R711 and Product Group 3725 are the internal Siemens classification codes. Useful for cross-referencing against legacy BOMs or when searching Siemens' own system for this exact variant.