The Siemens SENTRON 5SM1746-0 is a 4-pole residual current circuit breaker (RCCB), type AC, rated 63 A at 400 V AC with a 500 mA tripping residual current and a 10 kA short-circuit current rating.
The 63 A rating holds at 40 °C and 45 °C; above that it derates linearly to 50.4 A at 70 °C. The 500 mA residual-current sensitivity is for equipment protection or fire prevention, not personnel shock protection. That is typical for a distribution board fed from a transformer with moderate fault capacity; if the prospective fault current exceeds 10 kA, a backup fuse or MCB is needed upstream. Wire range accepts 1.5 to 25 mm² solid or stranded, terminated under screw terminals with a tightening torque of 2.5 to 3 N·m.
Deployment context
IP20 when installed with conductors connected — suitable for dry indoor enclosures, not washdown or outdoor exposure.