Siemens SIRIUS 3RU Manual page 178

Dimension drawings (dimensions in mm)
C.2 Dimension drawings for 3RU21 thermal overload relays
3RU2146-..B0 (S3, screw connection, contactor mounting)
Figure C-13 3RU2146-..B0
3RU2146-..B1 (S3, screw connection, mounting on stand-alone assembly support)
Figure C-14 3RU2146-..B1 and 3RU2946-3AA01
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SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
Manual, 09/2016, A5E03656507420A/RS-AB/003