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Siemens 5SY4125-6KK11 — 1-Pole MCB (DIN Rail)

Siemens 5SY4125-6KK11 SENTRON MCB, 1P B-Char 25A, 10/20kA

MPN5SY4125-6KK11

Siemens SENTRON 5SY4125-6KK11, 1-pole miniature circuit breaker, B-characteristic, 25 A rated current, 10 kA / 20 kA breaking capacity, 18 mm width.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

5SY4125-6KK11 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles1
Application suitabilityMechanical engineering / industry
5SY4125-6KK11 — Electrical & Protection
ParameterValue
Tripping characteristic classB
Rated value (EN 60898)10 kA
Energy limitation class3
Overvoltage categoryIII
5SY4125-6KK11 — Mounting & Connection
ParameterValue
Mounting positionany
Fastening methodQuick assembly system
Combined terminal, topYes
Combined terminal, bottomYes
Width18 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Modular width units1
Torque, min.-40 °C
Torque, max.75 °C
SealableYes
5SY4125-6KK11 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree3
Halogen-freeYes
Silicone-freeYes

Product details

Temperature derating — the real-world rating

The 25 A rating holds at 35 °C ambient. Above that, the breaker must be derated: 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.

Width is 18 mm — one modular unit on a standard DIN rail. Mounts in any position, fastens via the quick-assembly system (snap-on). IP20 with connected conductors; pollution degree 3 (conductive or dry non-conductive pollution). Combined terminal at top and bottom, touch protection included. Halogen-free and silicon-free construction.

Frequently asked questions

Where can I buy 5SY4125-6KK11 and how do I get a price?

This part is sourced to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time.

What is 5SY4125-6KK11's listed depth?

Depth is 76 mm, with an installation depth of 70 mm. Height is 90 mm, width 18 mm (1 modular unit).

Will 5SY4125-6KK11 drop into a panel specified around 5SY4116-6CC without rewiring?

Both are 1-pole SENTRON MCBs on the same 18 mm footprint, so mechanical fit is identical. The difference is rating: 5SY4125-6KK11 is 25 A B-curve, while 5SY4116-6CC is 16 A C-curve. If the circuit load and coordination study support 25 A B-curve, it is a drop-in replacement; otherwise verify the trip characteristic and cable sizing.

What compliance documentation does Siemens provide for 5SY4125-6KK11?

The breaker is designed for railway applications and carries EN 60898 and IEC 60947-2 ratings. It is halogen-free and silicon-free. Standard Siemens documentation includes the declaration of conformity and CE marking; specific RoHS/REACH/UL status should be confirmed from the manufacturer's current compliance documents.

MPN
5SY4125-6KK11