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Siemens 5SY4303-7KK11 — 3-Pole MCB (DIN Rail)

Siemens 5SY4303-7KK11 SENTRON MCB, 3P C-curve 3A, 10kA/35kA

MPN5SY4303-7KK11

Siemens SENTRON 5SY4303-7KK11 miniature circuit breaker, 3-pole, C characteristic, 3 A rated current, 10 kA (EN 60898) / 35 kA (IEC 60947-2) breaking capacity, for railway applications.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5SY4303-7KK11 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Suitability for operationMechanical engineering / industry
5SY4303-7KK11 — Protection
ParameterValue
Tripping characteristic (curve)C
Breaking capacity per EN 6089810 kA
Breaking capacity per IEC 60947-235 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Energy limitation class3
Pollution degree3
5SY4303-7KK11 — Electrical
ParameterValue
Rated current (AC)3 A
Rated voltage (AC, multi-phase)440 V
5SY4303-7KK11 — Mechanical
ParameterValue
Modular width units3
Mounting positionany
Width54 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Terminal tightening torque, max.75 °C
Terminal tightening torque, min.-40 °C
Combined terminal, topYes
Combined terminal, bottomYes
Fastening methodQuick assembly system
SealableYes
5SY4303-7KK11 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of surrounding temperaturemax. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C

Product details

The Siemens 5SY4303-7KK11 is a SENTRON miniature circuit breaker (MCB) — a 3-pole, C-curve unit rated at 3 A AC. The 10 kA breaking capacity per EN 60898 covers most residential and light commercial panelboard duty, while the 35 kA rating per IEC 60947-2 gives the headroom needed for industrial distribution boards with higher available fault current — that dual rating is the spec that decides fit when the panel SCCR study lands on your desk.

Integration notes

The 76 mm depth plus 70 mm installation depth means it sits flush in standard distribution boards without protruding past the gland plate. IP20 with connected conductors is the usual protected-environment rating for panel interiors — no washdown rating, so keep it inside the enclosure. Touch protection is built in.

Frequently asked questions

What is the breaking capacity of 5SY4303-7KK11?

10 kA per EN 60898 and 35 kA per IEC 60947-2. The higher figure applies when the MCB is used in an industrial distribution board where the prospective fault current is greater.

What is the thermal derating for 5SY4303-7KK11 at elevated temperatures?

At 35 °C it carries the full 3 A. At 40 °C it derates to 2.86 A, at 45 °C to 2.78 A, at 50 °C to 2.71 A, at 55 °C to 2.62 A, and at 60 °C to 2.54 A (–).

Where can I buy 5SY4303-7KK11 and get current pricing?

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

MPN
5SY4303-7KK11