Siemens SENTRON 5SV3744-6 — 4-pole RCCB, Type A, 40 A, 500 mA
The Siemens 5SV3744-6 is a 4-pole residual current operated circuit breaker (RCCB) from the SENTRON family, rated 40 A with a 500 mA residual operating current at 400 V AC. Its Type A design detects sinusoidal AC and pulsating DC fault currents, covering the majority of modern electronic loads. The 10 kA short-circuit current rating (SCCR) means it can safely interrupt fault currents up to that level without upstream damage — critical for coordinating with the branch circuit protection.
DIN-rail fit and panel integration
Occupies 4 modular width units (72 mm) on a 60 mm grid DIN rail (REG). Depth is 70 mm, height 90 mm. Mounts in any position. IP20 with connected conductors in an installed distribution board — standard for enclosed panel use, not for wet environments.