The Siemens 3RF3340-1AA06 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for AC-1 resistive loads at 40 A at 40 °C ambient. That AC-1 rating means it's sized for resistive heating or lighting banks — not motor starts, where inrush would exceed the silicon junction capacity. The 48-600 V operating range covers standard low-voltage AC supplies across global panels, and the 24 V DC control voltage keeps it compatible with PLC digital outputs or a dedicated 24 VDC rail.
Screw-terminal wiring on this 1-pole block matches the standard DIN-rail footprint of the SIRIUS 3RF3 series. The 105 x 27 x 122 mm package fits alongside other SIRIUS components in a control panel without crowding adjacent breakers or relays. For a commissioning engineer: land the 24 V DC control wires first, then the load-side 48-600 VAC — the screw terminals accept up to a 16 mm² conductor, so no ferrule adapters needed for typical panel wire.