Siemens 3TF4122 is a 3-pole AC motor contactor from the 3TF4 Sirius family, designed to switch three‑phase motors in industrial control panels. Depending on variant, it uses a 110/120 V AC coil or a 220 V AC coil and provides a 12 A AC‑3 rating on the load side with two normally open and two normally closed auxiliary contacts for interlocking and control circuits. The load contacts are rated up to 600 V, making this unit suitable for standard three‑phase motor starters in commercial and manufacturing environments.
