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Siemens 5SY8308-7 — Miniature Circuit Breakers (MCB)

Siemens 5SY8308-7 SENTRON MCB, 3P, C-Curve, 40 kA IEC

MPN5SY8308-7
Active

Siemens SENTRON 5SY8308-7 miniature circuit breaker, 3-pole, C-curve, 40 kA (IEC 60947-2), 3 MW, quick-assembly DIN rail mount.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

5SY8308-7 — Ratings
ParameterValue
Overvoltage categoryIII
5SY8308-7 — Mechanical
ParameterValue
Width54 mm
Height90 mm
Depth76 mm

Product details

It also carries a UL 1077 listing (5 kA at 400 V AC), so it qualifies as a supplementary protector in North American panels where the branch circuit already has a listed OCPD upstream.

Depth is 76 mm (70 mm installation depth).

Environment and derating

Rated for ambient temperatures from -40 °C to 75 °C, but the surrounding air's relative humidity matters: max 95% up to 55 °C, tapering to 35% at 75 °C. That's the manufacturer's derating curve for internal arc quenching — if your panel sits in a hot, humid mill environment, factor that in. IP20 with connected conductors — finger-safe terminals when wired, but not protected against dripping water or dust ingress. Sealable cover allows a lockout/tagout hasp to be fitted — required on some safety circuits to prevent an unauthorized restart.

Compliance documentation covers IEC/EN 60947-2, UL 1077, and CSA C22.2 No. 235. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) is adequate for installation on a machine baseplate or inside a mobile equipment panel.

MPN
5SY8308-7