Siemens 5SM3614-6BA SENTRON RCCB – 2-pole, 40 A, 300 mA, Type A
The Siemens 5SM3614-6BA is a 2-pole residual current operated circuit breaker (RCCB) from the SENTRON 5SM3 series, rated 40 A at 230 V AC with a 300 mA Type A tripping characteristic. It is designed for DIN-rail mounting in distribution boards, occupying 2 width units (36 mm) with a 70 mm installation depth. The 10 kA short-circuit current rating (SCCR) at 230 V AC means this RCCB can safely interrupt fault currents up to that level without upstream damage, meeting overvoltage category III requirements for fixed-installation panels. The instantaneous design (no short-time delay) ensures it trips within milliseconds on a residual current exceeding 300 mA. Terminals accept solid or stranded conductors from 1 to 16 mm², with a tightening torque of 2.5 to 3 N·m. The IP20 rating applies when installed in a distribution board with connected conductors; the housing is finger and back-of-hand safe per the protection against electrical shock standard.
Integration into a distribution board
Mounts on standard DIN rail (REG) in any position. The 70 mm installation depth fits standard 125 mm deep enclosures. Supply can enter from top or bottom; the 2-pole design switches both phase and neutral. Ambient temperature range is -25 to +45 °C operating, -40 to +75 °C storage. Silicon-free construction suits applications where silicone outgassing could contaminate contacts or optics. The mechanical service life is rated at 10,000 switching cycles typical.