It fits frame sizes S00, S0, S2, and S3. The connection method is ring terminal lug.
The switch is rated for a surge voltage of 6 kV, which aligns with IEC 60947-1 overvoltage category III for 400 VAC systems. It also carries a mirror contact function per IEC 60947-4-1 when used with a 3RT2 contactor — meaning the normally closed contact cannot remain closed if the main contactor welds. That is a safety feature for applications where you need to reliably detect a welded contactor, like in a safety circuit.
This auxiliary switch snaps onto the front of the contactor. Dimensions are 36 mm wide, 37.5 mm high, and 43.7 mm deep. Front protection class is IP00.