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Siemens 5SY8203-7 — 2-Pole MCB (DIN Rail)

Siemens SENTRON 5SY8203-7 MCB, 2-Pole C-Curve, 50 kA IEC

MPN5SY8203-7
Active

Siemens SENTRON 5SY8203-7, 2-pole miniature circuit breaker, C-curve, 50 kA at 400 V AC (IEC 60947-2), 36 mm wide, 76 mm deep, IP20.

Siemens 5SY8203-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY8203-7 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentMechanical engineering / industry
5SY8203-7 — Electrical
ParameterValue
Number of poles2
5SY8203-7 — Protection
ParameterValue
Tripping characteristic classC
Overvoltage categoryIII
5SY8203-7 — 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
5SY8203-7 — Environmental
ParameterValue
Pollution degree3
5SY8203-7 — Specifications
ParameterValue
At AC rated value400 V
With single-phase operation at AC rated value440 V

Product details

Siemens SENTRON 5SY8203-7 — 2-Pole C-Curve MCB

Mounting position is any, which helps when the panel layout is tight.

Breaking Capacity & Standards

Rated breaking capacity hits 50 kA at 400 V AC under IEC 60947-2, and 15 kA at 60 V DC under the same standard. For UL 1077 applications, it's rated 5 kA. That gap between IEC and UL figures is typical — UL 1077 is a component-level standard with different test conditions.

Environmental & Mounting

The quick assembly system (snap-on DIN rail) and combined top/bottom terminals speed panel wiring. Sealable — useful for lockout/tagout compliance. Vibration resistance per IEC 60068-2-6: ±1 mm at 5-25 Hz, 50 m/s² at 25-150 Hz.

Frequently asked questions

What is the breaking capacity of 5SY8203-7?

50 kA at 400 V AC per IEC 60947-2, 15 kA at 60 V DC per the same standard, and 5 kA per UL 1077.

Where can I buy 5SY8203-7 and how is it quoted?

Sourced to order through independent distribution against an RFQ. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers are published here.

What compliance documentation does Siemens provide for 5SY8203-7?

The breaker carries IEC/EN 60947-2 and UL 1077 approvals. It is halogen-free and silicon-free. Full RoHS/REACH declarations are available from the manufacturer on request.

MPN
5SY8203-7