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Siemens 5SL4203-6 — 2-Pole MCB (DIN Rail)

Siemens SENTRON 5SL4203-6 MCB, 2P B 3A 10kA

MPN5SL4203-6
Active

Siemens SENTRON 5SL4203-6 miniature circuit breaker, 2-pole, B-curve, 3 A, 10 kA breaking capacity at 400 V AC, 2 MW units.

Siemens 5SL4203-6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL4203-6 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentResidential buildings/infrastructure
5SL4203-6 — Electrical
ParameterValue
Number of poles2
5SL4203-6 — Protection
ParameterValue
Tripping characteristic classB
Overvoltage categoryIII
5SL4203-6 — Mechanical
ParameterValue
Modular width units2
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Min.-40 °C
Max.75 °C
Protection degree (IP)IP20, with connected conductors
5SL4203-6 — Environmental
ParameterValue
Pollution degree2
5SL4203-6 — Specifications
ParameterValue
Energy Limitation Class3

Product details

The Siemens SENTRON 5SL4203-6 is a 2-pole miniature circuit breaker rated 3 A with a B tripping characteristic, designed for 400 V AC systems and a 10 kA breaking capacity per EN 60898 and IEC 60947-2.

Derating and mounting

Rated 3 A at 30 °C ambient, but that drops to 2.84 A at 40 °C and 2.59 A at 55 °C — so if this breaker lives in a hot panel (say, next to a transformer or in a sun-exposed enclosure), you need to account for the derating or upsize one step. Mounting position is any, which simplifies panel layout, and the 2 MW width (36 mm) means it occupies two standard 18 mm DIN-rail slots.

Frequently asked questions

Where can I buy the 5SL4203-6 and get a price?

The 5SL4203-6 is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing.

What is the breaking capacity of the 5SL4203-6?

10 kA per both EN 60898 and IEC 60947-2 at 400 V AC, which covers most residential and light commercial fault levels.

Will the 5SL4203-6 drop into a panel specified for the 5SL3116-6MB?

Both are 2-pole SENTRON MCBs in the same 2 MW (36 mm) form factor, so mechanical fit is the same. But the 5SL3116-6MB is a different rating and curve — verify the electrical specs match your circuit before swapping.

What compliance documentation does Siemens provide for the 5SL4203-6?

As a current SENTRON product, it carries CE marking and is designed to EN 60898 and IEC 60947-2. RoHS and REACH declarations are standard from Siemens for this series.

MPN
5SL4203-6