Siemens 5SY5450-6 SENTRON MCB — 4-pole B-curve, 10 kA
The Siemens 5SY5450-6 is a 4-pole miniature circuit breaker from the SENTRON series, with a B-curve tripping characteristic. Rated 10 kA breaking capacity per IEC / EN 60898-2 and 15 kA at DC per IEC 60947-2, it handles 400 V AC multi-phase supply (440 V single-phase) and 880 V DC (max 1000 V DC operating voltage). Universal-current rated — AC or DC, polarity matters on DC side per the manufacturer's note. B-curve means magnetic trip between 3 and 5 times rated current — standard for general-purpose lighting and distribution circuits where moderate inrush is expected. The 10 kA IEC rating covers most commercial panel fault levels; the 15 kA DC rating at 1000 V makes it usable in DC bus or battery-string protection where higher interrupting capacity is needed.
Mounting and panel fit
Snap-on DIN-rail mount via quick assembly system, any orientation. Occupies 4 modular width units (72 mm). Depth 76 mm, installation depth 70 mm — standard for SENTRON 5SY series, so it drops into existing 5SY-based panels without re-spacing. IP20 with connected conductors; sealable (tamper-evident cover available). Combined terminals top and bottom — line and load can land on either side, no orientation restriction. Halogen-free and silicon-free construction for clean-room or sensitive electronics environments.
Lifecycle and compliance
Current production — no end-of-life notice. Dual-standard certified: IEC / EN 60898-2 and UL1077. Overvoltage category II, pollution degree 2. Energy limitation class 3. Ambient temperature range -40 °C to +75 °C, with humidity derating per the spec table. Vibration rated per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — suitable for machine-mounted panels or transport applications.