The Siemens SENTRON 5SM3614-8KL is a 2-pole residual current operated circuit breaker (RCCB) rated 40 A at 230 V AC, 50 Hz, with a 300 mA Type A selective trip characteristic. The selective (S-type) design means it introduces a deliberate time delay on earth faults, allowing downstream RCCBs to clear first — critical for coordination in multi-level distribution boards where you want the faulted subcircuit to isolate without taking the whole board dark.
Mounts on DIN rail (REG) in any position, occupies 2 width units (36 mm), and accepts solid or stranded conductors from 1 to 16 mm² at the screw terminals (torque 2.5–3 N·m). IP20 with conductors connected and distribution board installed — standard for enclosed panel use.