Siemens 3RT1975-5AP31 is a replacement coil for SIRIUS contactors in the 3RT1xx family (size S12), specifically compatible with 3RT107/3RT127/3RT147 devices. It provides a 220–240 V AC/DC control voltage to energize the coil and actuate the main contacts that switch motor loads in industrial control circuits. Designed for use with Siemens Sirius 3RT size S12 contactors, this coil offers a compact, field-replaceable solution for motor control and other heavy-load switching applications.
