What this 4-pole C-curve MCB covers
The Siemens 5SY7632-7 is a 4-pole (3P+N) miniature circuit breaker from the SENTRON series, rated for 400 V AC with a C tripping characteristic. It carries dual breaking capacities: 15 kA according to EN 60898-1 and 25 kA according to IEC 60947-2, with a DC rating of 15 kA at 60 V per IEC 60947-2. The C-curve means it trips between 5 and 10 times rated current — the standard choice for inductive loads like contactor coils, small motors, and control transformers where inrush is moderate but not extreme.
Breaking capacity — what the dual rating means for your panel
The 15 kA rating under EN 60898-1 is the value used for residential and light commercial distribution boards where the prospective short-circuit current (PSCC) stays under that threshold. The 25 kA rating under IEC 60947-2 is the industrial-grade figure — it certifies the breaker can clear higher fault currents typical in factory power distribution without welding contacts or failing to interrupt. If your panel's fault study shows a PSCC above 15 kA but below 25 kA, this breaker still fits because the 60947-2 rating governs. The UL 1077 supplementary protector rating of 5 kA is relevant only for North American listed panels where the breaker serves as supplementary protection behind a branch-circuit OCPD.
Mounting and panel integration
Snap-on mounting to DIN rail via the quick assembly system, occupying 4 modular width units (72 mm,). Installation depth is 70 mm; overall depth including terminals is 76 mm. Mounting position is any orientation. The IP20 rating applies only with connected conductors — standard for distribution board internal use, not for wet or dusty environments. Combined top and bottom terminals allow feed-through wiring from either direction. Neutral conductor is switched, so this 3P+N breaker disconnects the neutral as well as the three phases — required for TN-S or TT systems where neutral isolation matters.
Environmental and compliance
Rated for ambient temperatures from -40 °C to +75 °C, with humidity influence derating per: max 95% RH up to 55 °C, tapering to 35% RH at 75 °C. Halogen-free and silicon-free construction. Sealable — the toggle can be locked in the off position for lockout/tagout compliance. Overvoltage category III, pollution degree 3. Suitability flagged for mechanical engineering and industry.