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Siemens 5SY4203-6 — 2-Pole MCB (DIN Rail)

Siemens 5SY4203-6 SENTRON MCB, 2-Pole B-Curve, 10kA IEC

MPN5SY4203-6

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Siemens SENTRON 5SY4203-6, 2-pole miniature circuit breaker, B-curve, 10 kA (IEC 60898-1) / 35 kA (IEC 60947-2), 400 V AC, 36 mm width.

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

Specifications

5SY4203-6 — Identification
Parameter	Value
Product designation	Miniature circuit breaker
Brand name	SENTRON
Application environment	Mechanical engineering / industry

5SY4203-6 — Electrical
Parameter	Value
Number of poles	2

5SY4203-6 — Protection
Parameter	Value
Tripping characteristic class	B
Overvoltage category	III

5SY4203-6 — Mechanical
Parameter	Value
Modular width units	2
Width	36 mm
Height	90 mm
Depth	76 mm
Installation depth	70 mm
Mounting position	any
Min.	-40 °C
Max.	75 °C
Protection degree (IP)	IP20, with connected conductors

5SY4203-6 — Environmental
Parameter	Value
Pollution degree	3

5SY4203-6 — Specifications
Parameter	Value
At AC rated value	400 V
According to EN 60898 rated value	10 kA
With single-phase operation at AC rated value	440 V
Energy Limitation Class	3

Product details

The Siemens 5SY4203-6 is a 2-pole SENTRON miniature circuit breaker with B-curve tripping characteristic, rated 10 kA breaking capacity per IEC 60898-1 and 35 kA per IEC 60947-2.

Listed to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077. The UL 1077 supplementary-protector rating is 5 kA at 400 V AC.

Integration notes

Mounts in any position via the quick-assembly system (snap-on DIN rail). Combined terminal top and bottom — line and load can enter from either end, which simplifies busbar routing in a crowded panel. Neutral conductor is not switched (2-pole, both poles are phase). Operating temperature range -40 °C to 75 °C, with derating for humidity: max 95 % RH at 55 °C, dropping to 35 % at 75 °C. Supply frequency 50/60 Hz.

Frequently asked questions

What compliance documentation does 5SY4203-6 carry?

Certified to IEC / EN 60898-1, IEC / EN 60947-2, UL 1077, and CSA C22.2 No.235. Halogen-free and silicon-free. Pollution degree 3, overvoltage category III, IP20.