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Siemens 5SY6203-8 — 2-Pole MCB (DIN Rail)

Siemens 5SY6203-8 SENTRON MCB, 2-pole D-curve 3 A, 6/30 kA

MPN5SY6203-8

Siemens SENTRON 5SY6 series, miniature circuit breaker, 2-pole, D characteristic, 3 A, 400 V AC, 6 kA (EN 60898) / 30 kA (IEC 60947-2), 72 V DC, 15 kA DC (IEC 60947-2), IP20, quick assembly system.

$108.31Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5SY6203-8 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentMechanical engineering / industry
5SY6203-8 — Electrical
ParameterValue
Number of poles2
5SY6203-8 — Protection
ParameterValue
Tripping characteristic classD
Overvoltage categoryIII
5SY6203-8 — Mechanical
ParameterValue
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Min.-40 °C
Max.75 °C
Protection degree (IP)IP20, with connected conductors
5SY6203-8 — Environmental
ParameterValue
Pollution degree3

Product details

The 400 V AC rating (phase-to-phase) suits three-phase panels where the breaker protects a single-phase load across two poles. On the DC side, the 5SY6203-8 is rated 72 V with a 15 kA breaking capacity per IEC 60947-2, and it carries a UL 1077 / CSA C22.2 No.235 listing at 5 kA — useful for North American supplementary protection applications.

Integration and compliance notes

The 5SY6203-8 does not switch the neutral conductor — it is a 2-pole breaker protecting both phase conductors in a single-phase circuit, or two phases in a three-phase system. The ambient temperature influence is specified up to 75 °C with derating; the unit can be installed in any orientation, and the supply cord position is unrestricted.

Frequently asked questions

Will 5SY6203-8 drop into a panel specified around 5SY7140-8CC without rewiring?

No — the 5SY7140-8CC is a 40 A breaker; the 5SY6203-8 is 3 A. The physical footprint (2 width units, DIN rail mount, combined terminals) is identical, so the mechanical fit is the same, but the current rating is completely different. You would need to re-evaluate the branch circuit protection and conductor sizing before substitution.

What compliance documentation does Siemens provide for 5SY6203-8?

The breaker carries IEC/EN 60898 (6 kA), IEC 60947-2 (30 kA AC, 15 kA DC), and UL 1077 / CSA C22.2 No.235 (5 kA) certifications. It is halogen-free and silicon-free. Standard documentation includes the declaration of conformity and the manufacturer's test certificate; these are available upon request with the RFQ.

Where can I buy 5SY6203-8?

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

MPN
5SY6203-8