The Siemens 3RF3340-1AA22 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for 40 A in AC-1 duty at 40 °C ambient. The control supply accepts a wide range: 24-230 V AC/DC on the coil side, with a separate 110-230 V AC supply for the semiconductor gate drive. Termination is via screw terminals, which is the standard for panel wiring in most industrial enclosures.
Integration notes
Packaged dimensions are 105 x 27 x 122 mm — a slim 27 mm width that clips onto a standard 35 mm DIN rail, leaving room for adjacent motor starters or overload relays in a crowded enclosure. The 1-pole configuration means it switches one line phase; for three-phase resistive loads, order three units and interlock the control voltages.