The Siemens 3RF3350-1BA44 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for AC-15 duty at 25 A at 40 °C ambient. AC-15 is the switching category for electromagnetic loads — solenoids, contactor coils, clutches — where the inrush can be several times the holding current. The 25 A rating means this contactor handles those inrush peaks without welding or contact degradation, which is the whole point of going solid-state over a conventional electromechanical contactor in a coil-heavy control circuit.
Control and load voltage range
The load circuit accepts 48-460 V AC. The control input is 4-30 V DC, compatible with 24 V industrial DC supplies. Instantaneous switching responds within milliseconds of the control signal.
This part carries an active lifecycle status, meaning it is current-production and available through standard Siemens distribution channels. For a maintenance-spares purchaser, this is the straightforward case: no last-time-buy pressure, no need to hunt surplus. If your BOM requires full RoHS exemption documentation or REACH Article 33 communication, the compliance records are on file.
Integration notes
Screw terminals simplify panel wiring — no special crimp tooling needed. The packaging dimensions (105 x 50 x 125 mm) mean it fits a standard 22.5 mm or wider DIN-rail footprint with room for adjacent devices. For a panel-builder or wireman, the spring-cage alternative is common in the 3RF3 family, but this variant is screw-clamp; verify your terminal block preference matches. The single-pole configuration suits single-phase loads or DC switching where only one line needs breaking.