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Siemens 5SY7303-7 — Miniature Circuit Breakers (MCB)

Siemens 5SY7303-7 SENTRON MCB, 3A C-Curve 3P, 15/40 kA

MPN5SY7303-7
Active

Siemens SENTRON, Miniature circuit breaker, 5SY7303-7, 3P, 3 A, C characteristic, 15 kA / 40 kA, 3 MW units, IP20.

$49.53Ref. price · indicative, final on quote
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

5SY7303-7 — Ratings
ParameterValue
Overvoltage categoryIII
5SY7303-7 — Mechanical
ParameterValue
Width54 mm
Height90 mm
Depth76 mm

Product details

Rated for ambient temperature from -40 to 75 °C, though the current must be derated above 35 °C — at 50 °C the continuous rating drops to 2.71 A, at 60 °C to 2.54 A. That derating matters if the breaker shares a crowded panel with heat sources.

Certified to IEC / EN 60898-1 for residential and similar installation, and to IEC / EN 60947-2 / UL1077 for industrial applications. The dual rating means it qualifies for both a domestic consumer unit and an industrial control panel — one part number covers both jurisdictions. Sealable terminals allow the installer to lock the cover after commissioning, preventing tamper.

Frequently asked questions

What is the breaking capacity of the 5SY7303-7?

15 kA per EN 60898 and 40 kA per IEC 60947-2. The higher figure applies when the breaker is used under the industrial standard, giving headroom for high-fault panels.

What does the C-curve mean on this 3 A breaker?

The C characteristic trips at 5 to 10 times rated current (15–30 A magnetic release). It is suited for motor and transformer inrush on a 3 A branch; for purely resistive loads a B-curve would be a better fit.

Where can I buy the 5SY7303-7 and how is it quoted?

Sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock figures or price are published here.

MPN
5SY7303-7