The Siemens 3RF3310-1AA04-0KN0 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for AC-1 resistive loads at 10 A and 40 °C ambient. That AC-1 rating means it's sized for switching resistive heaters, lighting banks, or transformer primaries — not motor starts, which would need an AC-3 or AC-4 duty class. The 48-460 V AC supply range covers 120 V, 230 V, 277 V, 400 V, and 480 V line voltages without a tap change. Control is 24 V DC with low power consumption, so a standard PLC digital output can drive it directly without an interposing relay.
The 3RF3310-1AA04-0KN0 uses screw terminals for power and control wiring — no spring-cage or ring-lug requirement, so standard ferrule or bare-wire termination works. The 97 x 27 x 105 mm package fits a standard DIN-rail footprint, occupying roughly 27 mm of rail width. For panel builders, that means it slots into a 35 mm DIN rail alongside other SIRIUS components without needing extra spacing for heat sinks at the 10 A AC-1 load level.