The Siemens SENTRON 5SV3614-8KL is a 2-pole selective residual current circuit breaker (RCCB) rated at 40 A with a 300 mA Type A residual trip. It carries a 10 kA short-circuit current rating (SCCR) and mounts on a DIN rail. This is the part you spec when you need time-delayed tripping for selectivity downstream of a main RCD — it lets a fault clear on the branch without dropping the whole distribution board.
Selectivity and trip coordination
The selective design (S-type) means this RCCB withstands transient earth faults and inrush without tripping, so a downstream RCCB clears the fault first. Rated residual current is 300 mA — not the 30 mA you'd use for personal protection. That 300 mA threshold plus the intentional delay is what buys you coordination in a multi-level distribution panel. The 10 kA SCCR at the rated voltage tells you it safely interrupts a bolted fault up to that level without welding contacts or cascading upstream — critical for panel SCCR compliance per UL 508A or IEC 61439.
Temperature derating and installation
Rated current holds at 40 A across the full ambient range from -25 °C to 70 °C — no derating curve to calculate for most panel environments. That's unusual for a 40 A device and simplifies BOM validation. The 2-module-width (36 mm) body clips onto standard DIN rail (REG) and can be mounted in any orientation. IP20 applies once the distribution board is installed and conductors are connected; treat it as a panel-internal device, not a field-mounted enclosure. Silicon-free construction is noted for environments where outgassing contaminates sensitive contacts or optics.