The auxiliary switch — integrated, not a bolt-on — is rated 2 A at 24 V, 3 A at 120 V, and 1 A at 400 V, which governs compatibility with the PLC input or contactor coil it drives; at 24 VDC the 2 A rating handles most small relay coils, but verify inrush if piloting a larger contactor directly. Power dissipation per pole is 5.1 W at full load. The relay fastens to the contactor via M8 screws, not a DIN rail — the footprint is defined by the contactor it mates with, so verify the contactor frame size matches the S3 form factor.
Dimensions: 70 mm wide, 105 mm high, 125 mm deep. The depth is the key constraint in shallow enclosures — 125 mm from the mounting surface to the furthest terminal point. Main circuit terminals accept solid 2x (2.5…16 mm²) or stranded 2x (6…16 mm²), 2x (10…50 mm²), or 1x (10…70 mm²). Auxiliary terminals take 2x (0.5…2.5 mm²) solid or stranded. Temperature compensation is active from -40 to +60 °C, meaning the trip curve stays accurate across that ambient range without manual adjustment.