The Siemens SENTRON 5SM3316-6KK01 is a 2-pole residual current operated circuit breaker (RCCB), Type A, short-time delayed, rated 63 A at 230 V AC with a 30 mA trip threshold.
Snaps onto DIN rail (REG profile), occupies 2.5 width units (36 mm wide, 90 mm tall, 70 mm deep). Tightening torque 2.5 to 3 N·m on the screw terminals. Mounting position any; supply can land top or bottom, which simplifies busbar routing in a crowded enclosure.
Rated IP20 with conductors connected and distribution board installed — that's the usual for panel-mount RCCBs; it's not a standalone outdoor device. Ambient operating range -25 to +45 °C, storage -40 to +75 °C. Overvoltage category III, pollution degree 2 typical for fixed-installation switchgear. Silicon-free construction. Mechanical service life 10 000 switching cycles typical.