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Siemens 5SY4203-7 — 2-Pole MCB (DIN Rail)

Siemens 5SY4203-7 SENTRON MCB, 2-Pole C-Curve, 10 kA IEC

MPN5SY4203-7
Active

Siemens SENTRON 5SY4203-7, 2-pole miniature circuit breaker, C-curve, 10 kA (IEC 60898) / 35 kA (IEC 60947-2), 400 V AC, 60 V DC, IP20, 36 mm wide.

$30.48Ref. price · indicative, final on quote
Siemens 5SY4203-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY4203-7 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentMechanical engineering / industry
5SY4203-7 — Electrical
ParameterValue
Number of poles2
5SY4203-7 — Protection
ParameterValue
Tripping characteristic classC
Overvoltage categoryIII
5SY4203-7 — 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
5SY4203-7 — Environmental
ParameterValue
Pollution degree3
5SY4203-7 — Specifications
ParameterValue
At AC rated value400 V
According to EN 60898 rated value10 kA
With single-phase operation at AC rated value440 V
Energy Limitation Class3

Product details

Siemens 5SY4203-7 — 2-pole C-curve MCB for panel and industrial feeder protection

It is rated for 10 kA breaking capacity per IEC/EN 60898-1 and 35 kA per IEC/EN 60947-2, with a DC rating of 15 kA at 60 V per IEC 60947-2 and 5 kA per UL 1077.

The 10 kA rating under IEC 60898-1 is the standard domestic/commercial fault level; the 35 kA under IEC 60947-2 is the industrial rating that covers higher prospective fault currents typical in plant distribution boards. For DC circuits, the 15 kA at 60 V (IEC 60947-2) covers most 48 V and 60 V control bus applications. The UL 1077 rating of 5 kA is the supplementary-protector limit for North American panels.

Panel integration — DIN rail, sealable, halogen-free

Frequently asked questions

What is the breaking capacity of 5SY4203-7?

10 kA per IEC/EN 60898-1, 35 kA per IEC/EN 60947-2, 15 kA at 60 V DC per IEC 60947-2, and 5 kA per UL 1077. The 35 kA rating is the industrial figure that governs selectivity in plant distribution.

Will 5SY4203-7 drop into a panel specified for 5SY4140-7?

Both are 2-pole SENTRON MCBs with the same 36 mm width and DIN-rail mounting, so the physical fit is identical. The difference is the current rating — 5SY4140-7 is a 40 A frame, while the 5SY4203-7 is a lower-rated variant. Verify the load current before substitution.

What compliance documentation is available for 5SY4203-7?

The breaker is certified to IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077. It is halogen-free and silicon-free. RoHS and REACH declarations are standard with the SENTRON series; request them at quote time.

Where can I buy 5SY4203-7 and how is it quoted?

This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm offer.

MPN
5SY4203-7