What this RCCB does on the line
The Siemens 5SM3416-0 is a 2-pole residual-current circuit breaker (RCCB) from the SENTRON 5SM3 family, rated for 63 A continuous at 40 °C and tripping on 100 mA AC residual current — Type AC, meaning it detects sinusoidal AC fault currents only, not pulsed DC or smooth DC. That 100 mA threshold is above the 30 mA required for personal shock protection in most residential and light-commercial circuits; this unit is sized for equipment protection or fire-prevention duty where a higher trip threshold avoids nuisance tripping on leakage from filters, VFDs, or long cable runs.
Derating and thermal reality — the 63 A is a 40 °C number
The 63 A rating holds at 40 °C and 45 °C, but it drops stepwise above that: 59.22 A at 50 °C, 55.44 A at 55 °C, 51.66 A at 60 °C, 47.88 A at 65 °C, and 44.1 A at 70 °C. If this RCCB shares a crowded enclosure with other heat sources, the effective capacity is lower than the nameplate — plan the load at the derated figure for the actual ambient. The operating ambient range is -5 to +45 °C, so the 50 °C and above derating curve covers the storage or fault-condition scenario, not normal running.
Mounting and wiring — DIN rail, 2.5 MW, finger-safe
Snaps onto standard DIN rail (REG profile), occupying 2.5 width units (36 mm). The 70 mm depth matches typical modular enclosure back-can depths.
Sourcing posture — quoted to order
Sourced through independent distribution channels. This is a current-production Siemens catalog item, not a surplus or last-time-buy part.