The Siemens 3VU9132-0AB15-0RE0 is an undervoltage release accessory designed for the 3VU13 and 3VU16 series of motor protection switches.
Snaps onto the side of a 3VU13 or 3VU16 motor protection switch inside the control panel. Wiring is straightforward: the release coil connects ahead of the switch's main contacts so that a loss of control voltage opens the switch regardless of load condition. Keep the 230V AC supply clean — a shared transformer for the control circuit is typical.
