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Siemens 5SY7305-8 — Miniature Circuit Breakers (MCB)

Siemens 5SY7305-8 SENTRON MCB, D Curve, 3-Pole, 400V AC, 50k

MPN5SY7305-8
Active

Siemens SENTRON miniature circuit breaker, 3-pole, D characteristic, 400 V AC, 15 kA per EN 60898 / 50 kA per IEC 60947-2, 5SY7305-8.

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

5SY7305-8 — Ratings
ParameterValue
Overvoltage categoryIII
5SY7305-8 — Mechanical
ParameterValue
Width54 mm
Height90 mm
Depth76 mm

Product details

It is designed for motor and transformer protection where inrush currents exceed those of standard B or C curves — the D curve allows a higher short-term magnetic trip threshold, so it won't nuisance-trip on the start-up surge of a pump or compressor. At DC (per IEC 60947-2) it is rated 15 kA; under UL 1077 / CSA C22.2 No. 235 it carries 5 kA at AC.

Environmental and compliance details

Halogen-free and silicon-free construction. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. IP20 with connected conductors.

Frequently asked questions

What is the breaking capacity of 5SY7305-8?

15 kA per EN 60898 and 50 kA per IEC 60947-2 at 400 V AC. At DC (IEC 60947-2) it is 15 kA; under UL 1077 / CSA C22.2 No. 235 it is 5 kA at AC.

What is the D tripping curve used for?

The D characteristic allows a higher magnetic trip threshold, so the breaker tolerates the inrush current of motors and transformers without nuisance tripping.

Where can I buy 5SY7305-8?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time.

MPN
5SY7305-8