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Siemens 5SY8405-8 — Miniature Circuit Breakers (MCB)

Siemens 5SY8405-8 SENTRON MCB, 4P, D Curve, 0.5 A, 70 kA

MPN5SY8405-8
Active

Siemens SENTRON miniature circuit breaker, 4-pole, D characteristic, 0.5 A, 70 kA IEC breaking capacity, 5SY8405-8.

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

5SY8405-8 — Ratings
ParameterValue
Overvoltage categoryIII
5SY8405-8 — Mechanical
ParameterValue
Width72 mm
Height90 mm
Depth76 mm

Product details

The 72 mm width (4 modular units) and 76 mm depth fit standard 36 mm-wide module spacing — plan for a 4-pole slot in the distribution board. IP20 rating applies with connected conductors; the touch-protection feature means finger-safe terminals when wired.

At DC (per IEC 60947-2) it is rated 15 kA; under UL 1077 / CSA C22.2 No. 235 it is 5 kA. The 70 kA figure means it can be installed at the service entrance or on a high-fault bus without requiring a current-limiting upstream fuse.

Temperature derating is published: at 45 °C the rating holds at 0.5 A; at 50 °C it drops to 0.49 A; at 55 °C to 0.47 A. Ambient humidity limits are specified per the surrounding-temperature influence table. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. These matter for installation on a machine frame or near rotating equipment.

MPN
5SY8405-8