Siemens 3RT1975-5AF31 is a changeover magnet coil for size S12 contactors (3RT107/3RT127/3RT147) that accepts both AC and DC control voltages of 110–127 V. For AC operation at 50/60 Hz, it specifies 110–127 V AC input with an apparent pick-up power of 830 VA and a holding power of 9.2 VA, and an inductive power factor around 0.9. For DC operation, the coil accepts 110–127 V DC with a rated value of 127 V. The unit has a net weight of 1.34 kg, uses screw terminals, and is cataloged under Siemens Sirius as a changeover mechanism for standard and economy circuits.
