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Siemens 5SY7125-7 — 1-Pole MCB (DIN Rail)

Siemens 5SY7125-7 SENTRON MCB, 25A C-Curve, 1P, 15kA IEC

MPN5SY7125-7
Active

Siemens SENTRON 5SY7125-7, 1-pole miniature circuit breaker, C-curve, 25 A rated, 15 kA (IEC 60898) / 25 kA (IEC 60947-2) breaking capacity, 18 mm wide, IP20.

Siemens 5SY7125-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY7125-7 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles1
Pole design1P
Application suitabilityMechanical engineering / industry
5SY7125-7 — Electrical & Protection
ParameterValue
Tripping characteristic classC
Energy limitation class3
Overvoltage categoryIII
5SY7125-7 — 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
5SY7125-7 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree3
Halogen-freeYes
Silicone-freeYes

Product details

Thermal derating is published for the full ambient range: 25 A at 35 °C, 23.8 A at 40 °C, down to 21.2 A at 60 °C.

Mounting position is any orientation. The IP20 rating applies with connected conductors; the breaker is sealable, which matters for applications requiring tamper-evident covers after commissioning.

The breaker is dual-rated to IEC/EN 60898-1 and IEC/EN 60947-2 / UL1077. Halogen-free and silicon-free construction. The product designation per EN 61346-2 and IEC 81346-2 is F (protective device). The surrounding temperature influence is specified up to 95% RH at 55 °C, 55% at 70 °C, and 35% at 75 °C — relevant for condensation-prone environments like food processing or outdoor cabinets.

Frequently asked questions

Where can I buy 5SY7125-7 and how do I get a price?

The 5SY7125-7 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is 5SY7125-7's listed depth (76 mm) on this component line?

The 5SY7125-7 has a depth of 76 mm and an installation depth of 70 mm, fitting standard DIN-rail enclosures with that clearance.

What compliance documentation does this brand provide for 5SY7125-7 (RoHS, REACH, UL, IEC)?

The 5SY7125-7 is dual-rated to IEC/EN 60898-1 and IEC/EN 60947-2 / UL1077. It is halogen-free and silicon-free. RoHS/REACH declarations are standard for the SENTRON series.

Will 5SY7125-7 drop into a panel that was specified around 5SY4125-7CV without rewiring?

The 5SY7125-7 shares the same 1-pole, 18 mm wide DIN-rail footprint as the 5SY4125-7CV. Both are C-curve breakers, so a direct swap is mechanically possible. However, the 5SY7125-7 has a higher breaking capacity (15 kA IEC vs the 5SY4125-7CV's rating), so verify the panel's prospective fault current and the existing busbar arrangement before substituting.

MPN
5SY7125-7