What it is and what it does
The Siemens 5SY7332-7 is a SENTRON miniature circuit breaker (MCB) with three poles, a C tripping characteristic, and a rated breaking capacity of 15 kA per EN 60898-1 or 25 kA per IEC 60947-2. It is rated for 400 V AC (440 V max in multi-phase or single-phase operation) and 60 V DC (72 V DC max). The C-curve means it trips between 5 and 10 times rated current — the standard choice for general-purpose motor and lighting circuits where moderate inrush is expected. This is a current-production part (lifecycle stage: current) and is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
Breaking capacity and standards — what the ratings mean for your panel
The 5SY7332-7 carries three distinct breaking capacity ratings depending on the standard applied: 15 kA under EN 60898-1 (the household / commercial standard), 25 kA under IEC 60947-2 (the industrial standard), and 5 kA under UL 1077 / CSA C22.2 No. 235. The 25 kA rating at 400 V AC means this MCB can safely interrupt a fault current of up to 25,000 A without welding its contacts or rupturing the case — critical for selectivity in industrial panels where upstream breakers are sized for high fault current. The DC rating of 15 kA at 60 V DC (per IEC 60947-2) covers battery-backed control circuits or DC bus protection. It is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077. The UL 1077 listing means it is recognized as a supplementary protector in North American panels — not a branch-circuit rated breaker per UL 489, but acceptable for protecting individual loads downstream of a branch-circuit OCPD.
Mounting and integration — DIN-rail fit and panel space
The 5SY7332-7 occupies 3 modular width units (each 18 mm, so 54 mm total) on a standard DIN rail. Depth is 76 mm (70 mm installation depth behind the panel surface). It snaps onto any DIN rail via the quick assembly system and can be mounted in any orientation. The IP20 rating (with connected conductors) means it is suitable for enclosed panel use — not for washdown or outdoor exposure without a secondary enclosure. The terminals accept combined top and bottom wiring. Supply can come from either end. Pollution degree 3 and overvoltage category III mean it is rated for the harsh electrical environment inside an industrial control panel — no additional creepage or clearance derating needed for typical factory floor conditions.
Environmental range and materials
Operating temperature spans -40 °C to 75 °C, with humidity derating: 95% RH up to 55 °C, 55% RH up to 70 °C, 35% RH up to 75 °C. The housing is halogen-free and silicon-free — a requirement in clean-room, food-processing, or semiconductor-adjacent installations where outgassing can contaminate product or sensitive optics. Energy limitation class 3 means this MCB limits the let-through energy (I²t) to a low level, reducing arc-flash hazard downstream and allowing smaller cable sizing in coordinated panels.