What this MCB is and what the ratings mean for fit
The Siemens SENTRON 5SL6314-7 is a 3-pole miniature circuit breaker (MCB) from the 5SL6 series, designed for branch-circuit protection in residential and infrastructure panels. Its 0.3 A rated current with a C tripping characteristic means it is intended for loads with moderate inrush — think control transformers, small contactor coils, or indicator lamp circuits — where the magnetic trip threshold (5–10× In) avoids nuisance trips on startup. The 6 kA breaking capacity is certified to both EN 60898 and IEC 60947-2, so it safely interrupts fault currents up to that level in a 400 V AC system. That dual-standard rating is the key: EN 60898 covers the domestic/infrastructure duty, while IEC 60947-2 confirms the same interrupting rating for industrial panel applications — one part, two compliance paths. The C-curve is the standard choice for general-purpose distribution in European-style panels; it holds through 5× rated current for several seconds before the thermal bimetal trips, then the magnetic trip operates between 5× and 10× In. For a 0.3 A MCB, that means the magnetic pickup is around 1.5–3.0 A — well above the steady-state draw of a small transformer or relay, but fast enough to clear a hard short. The 6 kA SCCR at 400 V AC is the maximum prospective fault current this breaker can safely interrupt; if your panel's available fault current exceeds that, you need an upstream current-limiting device or a higher-rated breaker.
Panel integration and wiring
This MCB occupies 3 width units on a DIN rail — 54 mm wide — with an installation depth of 70 mm and overall depth of 76 mm. The screw terminals accept solid or stranded conductors from 0.75 to 25 mm², with a tightening torque of 2.5 to 3 N·m. That conductor range covers everything from 1.5 mm² control wiring up to 6 mm² or 10 mm² feeder tails, so it fits standard panel wiring practice without adapters. Mounting position is unrestricted, and the enclosure is rated IP20 with conductors connected — suitable for enclosed distribution boards, not for wet or dusty environments.
Compliance and approvals
The breaker is halogen-free and silicon-free, which matters for applications sensitive to outgassing — clean rooms, medical equipment, or sealed enclosures where corrosive byproducts from a fault could damage contacts. The sealable feature allows the installer to lock the toggle in the OFF position with a padlock, meeting lockout/tagout requirements without an accessory. Overvoltage category 3 confirms it is rated for fixed-installation downstream of the main distribution board. The product is classified per DIN EN 61346-2 and DIN EN 81346-2 as function code F, which maps to 'protective device' in the standard functional naming scheme.