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Siemens 5SY4203-8 — 2-Pole MCB (DIN Rail)

Siemens 5SY4203-8 SENTRON MCB, 2P, D Curve, 10kA

Name: 5SY4203-8
Brand: Siemens
SKU: 5SY4203-8
Availability: LimitedAvailability
Author: Calibration Cal

MPN5SY4203-8

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Siemens SENTRON 5SY4203-8 miniature circuit breaker, 2-pole, D tripping characteristic, 10 kA (EN 60898) / 35 kA (IEC 60947-2).

$22.86Ref. price · indicative, final on quote

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Siemens 5SY4203-8 datasheet (PDF)

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

Specifications

5SY4203-8 — Identification
Parameter	Value
Product designation	Miniature circuit breaker
Brand name	SENTRON
Application environment	Mechanical engineering / industry

5SY4203-8 — Electrical
Parameter	Value
Number of poles	2

5SY4203-8 — Protection
Parameter	Value
Tripping characteristic class	D
Overvoltage category	III

5SY4203-8 — 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

5SY4203-8 — Environmental
Parameter	Value
Pollution degree	3

5SY4203-8 — 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

Product details

Ratings and environment

The 5SY4203-8: Rated operational voltage is 400 V AC single-phase or 440 V AC multi-phase; DC rating is 60 V (72 V max). Ambient temperature range is -40 to 75 °C, with constraints on relative humidity: 95% up to 55 °C, derating to 35% at 75 °C. Vibration resistance per IEC 60068-2-6 is ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz. The enclosure is rated IP20 with conductors connected, halogen-free and silicon-free.

Overall dimensions: height 90 mm, width 36 mm, depth 76 mm. Installation depth is 70 mm. The combined terminal at top and bottom accepts conductors for easy ring or fork lug connections. Sealable with a locking device to prevent unauthorized switching.

Sourcing

This breaker is a current-production item (lifecycle stage: current). No last-time-buy or successor notice applies.

Frequently asked questions

What compliance standards does it meet?

It is designed to IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077. Additionally, it is halogen-free and silicon-free, with IP20 protection when conductors are connected.