The Siemens 5SL6214-7 is a SENTRON series miniature circuit breaker (MCB) with a C-curve tripping characteristic, 2 poles, and a rated current of 0.3 A at 400 V AC. Its breaking capacity is 6 kA per both EN 60898 and IEC 60947-2, making it suitable for residential and infrastructure branch-circuit protection where the fault level stays within that limit.
Ratings and what they mean for fit
The C-curve (tripping characteristic class C) means the magnetic trip operates at 5 to 10 times rated current — appropriate for moderate inrush loads like small motors, lighting ballasts, and control transformers. At 0.3 A, this is a low-current MCB sized for control circuits, not main power feeds. The 6 kA breaking capacity is the same under both EN 60898 (household) and IEC 60947-2 (industrial) standards, so the part can be specified in either context without a separate rating check. The maximum operating voltage is 440 V AC for multi-phase operation, and the DC rating is 72 V maximum. Thermal derating is published: 0.3 A at 30 °C, 0.28 A at 40 °C, 0.27 A at 45 °C, and 0.25 A at 55 °C. If the panel ambient runs above 30 °C, the effective current capacity drops — size the upstream protection accordingly.
Mechanical and environmental fit
The 5SL6214-7 occupies 2 modular width units (36 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. It can be mounted in any position, which simplifies panel layout. The IP20 rating applies only with connected conductors — the terminals are touch-protected per the product feature. The housing is halogen-free and silicon-free, which matters for environments sensitive to outgassing (e.g., clean rooms, sealed enclosures). Sealable per the spec, allowing lockout/tagout compliance. Mechanical service life is 10,000 switching cycles typical — adequate for branch-circuit protection where the breaker is not cycled frequently as a switch.