What this MCB is and where it fits
The Siemens 5SY7416-8 is a 4-pole SENTRON miniature circuit breaker with a D tripping characteristic, rated 15 kA breaking capacity per IEC/EN 60898-1 and 25 kA per IEC/EN 60947-2. It's also UL 1077 listed at 5 kA. The D-curve means it's built for high-inrush loads — motor starters, transformers, welding equipment — where the magnetic trip threshold sits at 10–20× In, so nuisance tripping on startup is less likely than with a B or C curve. Rated for 400 V AC (440 V max in single- or multi-phase operation) and 60 V DC (72 V max), it snaps onto a DIN rail via the quick-assembly system and occupies 4 modular width units (72 mm). Mounting position is any, and the IP20 rating with connected conductors is standard for enclosed panel gear.
DIN-rail fit and panel integration
At 72 mm wide (4 MW), 90 mm tall, and 76 mm deep, the 5SY7416-8 fits standard DIN-rail enclosures with 70 mm installation depth. Combined terminals top and bottom accept supply from any position, and the sealable design allows lockout/tagout on the panel door. Halogen-free and silicon-free construction matters for environments where outgassing during a fault could contaminate optics or electronics.
Environmental and compliance notes
Ambient temperature range spans -40 °C to 75 °C, with humidity derating above 55 °C (95% RH up to 55 °C, 55% up to 70 °C, 35% up to 75 °C). Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. Pollution degree 3 and overvoltage category III suit industrial control panels where conductive dust and transient surges are expected.