The Siemens 3RF3310-1BA26 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for AC-15 duty at 6 A at 40 °C. AC-15 is the utilization category for electromagnetic loads — solenoids, contactor coils, and small valve actuators — so this rating tells you the contactor can handle the inrush current those loads draw on closure. The switching voltage range spans 48-600 V on the power circuit, with a control voltage of 110-230 V AC for the coil side. Instantaneous switching means no zero-crossing delay; the output turns on as soon as the control signal arrives, which matters for timing-critical sequences. The screw terminals simplify panel wiring — no special crimp tooling needed for the power or control connections. The 1-pole configuration switches one phase, so for single-phase loads or as a phase-angle fired element in three-phase circuits, this fits directly. The 110-230 V AC control coil range covers standard European panel voltages without an extra transformer.
The packaging dimensions are 97 x 27 x 105 mm, so it occupies a single modular width on the rail — roughly 27 mm per pole. For a multi-pole three-phase setup, you'd stack three units side by side, or use the 3-pole variant if the application needs coordinated switching. The screw terminals accept standard ferrule or solid conductors; strip length and torque values follow the terminal marking on the housing.