The Siemens 5SM3616-6KL is a SENTRON 5SM3-series residual current circuit breaker (RCCB), 2-pole, Type A, rated 63 A at 230 V AC with a 300 mA residual trip threshold. It carries a 10 kA short-circuit current rating and is designed for instantaneous tripping — no short-time delay.
The 300 mA trip threshold is a delayed-action protection level typically used for fire prevention in circuits with high leakage from filters or long cable runs, not for direct personal shock protection (which requires 30 mA or lower). This matches the typical prospective short-circuit current at the service entrance of most European residential and light-commercial panels. The 63 A rated current and 2-pole configuration suit it for a single-phase 230 V feeder or submain — for example, a large lighting circuit, a small distribution board, or a high-power appliance feed. The 2.5-module width (36 mm) on DIN rail means it occupies two and a half 18 mm slots, so factor that into panel fill calculations.
Mounts on DIN rail (REG) in any position. The 70 mm installation depth matches standard 70 mm deep enclosures — no need for a deeper gland plate. Terminals accept solid or stranded conductors from 1.5 to 25 mm²; tighten to 2.5–3 N·m with a screwdriver. IP20 with connected conductors, so it requires enclosure protection against moisture and dust. The device is silicon-free.