The Siemens 3RT2916-1GA00 is a plug-in additional load module from the SIRIUS family, designed to clip directly onto size S00 contactors (3RT2.1 series) and auxiliary contactors (3RH2 series).
The module clips onto the contactor front — no DIN-rail space consumed beyond the base contactor itself. Dimensions are 28 mm wide, 46 mm tall, and only 9 mm deep, so it adds negligible projection beyond the contactor face.
