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Siemens 5SY4125-7CV — 1-Pole MCB (DIN Rail)

Siemens 5SY4125-7CV MCB, 1P C-Curve 25A 15kA IEC 60947-2

MPN5SY4125-7CV

Siemens 5SY4125-7CV, 1-pole miniature circuit breaker, C-curve, 25 A rated, 15 kA breaking capacity per IEC 60947-2, 1 MW width, IP20.

Siemens 5SY4125-7CV datasheet (PDF)
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

5SY4125-7CV — Identification
ParameterValue
Number of poles1
Pole design1P
Application suitabilityMechanical engineering / industry
5SY4125-7CV — Electrical & Protection
ParameterValue
Tripping characteristic classC
Overvoltage categoryIII
5SY4125-7CV — 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
5SY4125-7CV — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree3
Halogen-freeYes
Silicone-freeYes

Product details

The Siemens 5SY4125-7CV is a 1-pole miniature circuit breaker with C-curve trip characteristic, rated 25 A at 35 °C and 230/400 V AC.

Temperature derating — don't ignore it

At 40 °C it derates to 22.22 A; at 45 °C to 20.7 A; at 50 °C to 19.1 A; at 55 °C to 17.27 A. The humidity limits are also specified: max 95% RH up to 55 °C, then dropping to 55% at 70 °C and 35% at 75 °C. This matters for washdown or outdoor cabinets.

Single modular width (18 mm) on DIN rail, 76 mm depth, 90 mm height. The quick-assembly fastening system snaps onto standard EN rail. Mount in any position. Terminals accept combined top/bottom wiring — no special orientation needed. IP20 with conductors connected; pollution degree 3 (conductive pollution, typical for industrial panels). Installation depth 70 mm leaves clearance behind the rail.

Frequently asked questions

What is the breaking capacity of 5SY4125-7CV?

15 kA at 230/400 V AC per IEC 60947-2. That's the rated short-circuit breaking capacity — sufficient for most industrial sub-distribution boards.

Will 5SY4125-7CV drop into a panel specified around 5SY4113-7CV?

Yes — same 1-pole form factor, same 18 mm width, same C-curve, same IEC 60947-2 standard. The difference is the current rating: 25 A vs 13 A. If the panel wiring and downstream protection are sized for 25 A, it's a direct mechanical swap. No rewiring needed for the breaker itself, but verify the load cable ampacity.

Where can I buy 5SY4125-7CV and how is it quoted?

Sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time. Volume pricing drops with quantity — send the RFQ with your target MOQ.

What compliance documentation does 5SY4125-7CV carry?

Rated per IEC / EN 60947-2. Halogen-free and silicon-free construction. The standard covers the safety and performance requirements for low-voltage switchgear. Additional documentation (RoHS, REACH, CE) is typically included with the shipment; request it on the PO if needed for your quality records.

MPN
5SY4125-7CV