Siemens 5SY4140-5 — SENTRON 1-pole MCB, Characteristic A
The Siemens 5SY4140-5 is a SENTRON miniature circuit breaker, single-pole, with tripping characteristic A. It is rated for 400 V AC and carries a breaking capacity of 10 kA per IEC / EN 60898-1 and 15 kA per IEC 60947-2. At DC, it breaks 15 kA at 60 V (max 72 V). That 10 kA figure under EN 60898 is the standard for residential and light commercial branch-circuit protection; the 15 kA rating under IEC 60947-2 gives headroom for industrial panel coordination where fault currents run higher. Characteristic A trips between 2 and 3 times rated current — fast enough to protect semiconductor loads or long cable runs where inrush is minimal. The 1-module width (18 mm) snaps onto DIN rail and fits any mounting position; combined terminals top and bottom simplify daisy-chaining. Deployment context: this breaker is suited for mechanical engineering and industrial control panels. The IP20 rating with connected conductors means it lives inside an enclosure — not exposed to washdown. Overvoltage category III and pollution degree 3 confirm it is designed for fixed installations with transient overvoltages typical of mains supply.
Lifecycle and sourcing
Lifecycle status is current production. No phase-out or last-time-buy notice on record. The 5SY4140-5 is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.
Compliance and documentation
The 5SY4140-5 is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077. It is halogen-free and silicon-free, which matters for environments sensitive to corrosive off-gassing (e.g., data centers, medical equipment). Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz. The breaker is sealable for tamper-proofing after commissioning.
Environmental and mounting
Ambient temperature range is -40 °C to +75 °C. Humidity derating applies: max 95% up to 55 °C, then 55% up to 70 °C, then 35% at 75 °C. Mounting position is any; fastening is via quick-assembly system — standard DIN-rail clip. Installation depth is 70 mm, overall depth 76 mm. The 18 mm width matches a single modular unit, so it occupies one slot on the rail.