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Siemens 5SY4225-6KK11 — 2-Pole MCB (DIN Rail)

Siemens 5SY4225-6KK11 SENTRON MCB, 25A B-Curve 2P 10kA

MPN5SY4225-6KK11

Siemens SENTRON 5SY4225-6KK11 miniature circuit breaker, B-curve, 2-pole, 25 A rated, 10 kA (EN 60898) / 20 kA (IEC 60947-2), for railway applications.

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

Specifications

5SY4225-6KK11 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentMechanical engineering / industry
5SY4225-6KK11 — Electrical
ParameterValue
Number of poles2
5SY4225-6KK11 — Protection
ParameterValue
Tripping characteristic classB
Overvoltage categoryIII
5SY4225-6KK11 — 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
5SY4225-6KK11 — Environmental
ParameterValue
Pollution degree3
5SY4225-6KK11 — Specifications
ParameterValue
Energy Limitation Class3

Product details

Siemens 5SY4225-6KK11 — 25 A B-Curve MCB for Railway & Industrial Panels

The Siemens 5SY4225-6KK11 is a SENTRON miniature circuit breaker rated at 25 A with a B-curve tripping characteristic, 2 poles, and a breaking capacity of 10 kA per EN 60898 or 20 kA per IEC 60947-2. Designed for railway applications (per), it also carries suitability for mechanical engineering and general industry use. The 25 A rating holds at 35 °C ambient; derate to 23.48 A at 40 °C, 22.68 A at 45 °C, 21.85 A at 50 °C, 21 A at 55 °C, and 20.1 A at 60 °C (–).

Breaking Capacity & Selectivity Headroom

IP20 with connected conductors confirms it's for protected environments only.

Depth is 76 mm, height 90 mm, width 36 mm — two modular units. Touch protection is built in. Sealable for tamper-proofing in metered or secured panels. Halogen-free and silicon-free construction suits sensitive environments like rail signaling or medical equipment.

Frequently asked questions

What is the breaking capacity of 5SY4225-6KK11?

10 kA per EN 60898 and 20 kA per IEC 60947-2. The higher IEC rating gives selectivity headroom in industrial or railway sub-distribution panels.

Will 5SY4225-6KK11 fit in a panel designed for 5SY4116-6CC?

Both are 2-module-width (36 mm) SENTRON MCBs on the same DIN-rail footprint, so the mechanical fit is identical. The 5SY4225-6KK11 is a 25 A B-curve; the 5SY4116-6CC is a 16 A C-curve — the difference is the rating and trip characteristic, not the panel cutout or busbar spacing.

What compliance documentation is available for 5SY4225-6KK11?

The breaker is designed to EN 60898 and IEC 60947-2. It carries overvoltage category III and pollution degree 3 ratings. Halogen-free and silicon-free construction supports RoHS/REACH compliance, though specific declarations should be confirmed at quote time.

Where can I buy 5SY4225-6KK11?

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

MPN
5SY4225-6KK11