What it is and what it does
The Siemens 5SY5263-7 is a 2-pole SENTRON miniature circuit breaker with a C-curve trip characteristic, rated 10 kA breaking capacity per IEC/EN 60898-2 and 15 kA per IEC 60947-2. It handles AC voltages up to 400 V (single- and multi-phase) and DC up to 440 V, with a maximum DC operating voltage of 500 V. The C-curve means it trips between 5 and 10 times rated current — standard for motor and lighting circuits where a short inrush won't nuisance-trip a general-purpose branch.
Where it fits in the panel
The 5SY5263-7 snaps onto a DIN rail (quick assembly system) and occupies 2 modular width units (36 mm wide, 90 mm tall, 76 mm deep, 70 mm installation depth). It mounts in any position, which helps when panel space is tight or the rail runs vertical. The IP20 rating means finger-safe terminals once wired — standard for enclosed panel gear, not for wet environments. Combined terminals top and bottom simplify daisy-chaining or looping power through the breaker without extra link bars. Sealable, halogen-free, silicon-free construction suits food, pharma, or other sensitive environments where outgassing matters.
Breaking capacity and standards
Dual-rated: 10 kA under IEC/EN 60898-2 (the standard for domestic and similar installations) and 15 kA under IEC 60947-2 (industrial switchgear). The higher 15 kA rating gives headroom for industrial panels with higher prospective fault currents — useful when the breaker sits downstream of a larger transformer or in a high-capacity distribution board. It also carries UL1077 recognition, so it can serve as a supplementary protector in North American panels. Overvoltage category III and pollution degree 3 mean it's rated for fixed installations inside building distribution boards, not just clean control cabinets. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) covers the shake you get near motors or conveyors.
Sourcing reality
Active and in production — no last-time-buy or EOL notice on this code. Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time.