Siemens 5SL3620-7MB — 20 A C-Curve MCB, 3P+N, 400 V
The Siemens 5SL3620-7MB is a SENTRON miniature circuit breaker rated 20 A with a C tripping characteristic, configured 3P+N (4 poles) for 400 V AC three-phase systems. Breaking capacity is 4.5 kA per EN 60898 and 5 kA per IEC 60947-2 — the EN figure governs residential and light commercial distribution boards; the IEC figure applies when the breaker is used in industrial panel applications where the standard allows it.
No official successor has been announced. The part remains a standard catalog item in the SENTRON 5SL series.
The IP20 rating applies only with connected conductors — this is normal for a distribution-board MCB, not a standalone enclosure. Sealable design allows tamper-proofing in metered or secured installations.
Designed for overvoltage category III, pollution degree 2. Rated for residential buildings and infrastructure. Halogen-free and silicon-free construction suits environments sensitive to outgassing (data centers, clean rooms). Mechanical service life is 20 000 operating cycles typical. DC rating is 72 V maximum.