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Siemens 5SL3125-7MB — 1-Pole MCB (DIN Rail)

Siemens 5SL3125-7MB SENTRON MCB, 1P C 25A 4.5kA

MPN5SL3125-7MB
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Siemens SENTRON 5SL3125-7MB, miniature circuit breaker, 1-pole, C characteristic, 25 A, 4.5 kA per EN 60898, 230/400 V AC.

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

Specifications

5SL3125-7MB — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles1
Pole design1P
Application suitabilityResidential buildings/infrastructure
5SL3125-7MB — Electrical & Protection
ParameterValue
Tripping characteristic classC
Energy limitation class3
Overvoltage categoryIII
5SL3125-7MB — Mounting & Connection
ParameterValue
Mounting positionany
Width18 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Modular width units1
Torque, min.-40 °C
Torque, max.75 °C
SealableYes
5SL3125-7MB — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree2
Halogen-freeYes
Silicone-freeYes

Product details

It breaks fault currents up to 4.5 kA per EN 60898 at 230/400 V AC, which covers the standard residential and light commercial service-entrance fault levels.

Footprint and panel fit

Occupies one 18 mm modular width unit on a DIN rail. Mounting position is unrestricted — vertical, horizontal, upside-down in a tight enclosure — the thermal-magnetic trip doesn't care. IP20 with conductors connected, which is the norm for a panelboard interior; no washdown rating here.

If your installation requires a higher SCCR (say 6 kA or 10 kA), you'd step up to the 5SL6 or 5SL4 series. The 25 A rating is common for cooker circuits, shower feeds, or sub-distribution.

Frequently asked questions

What is the closest functional alternative to the 5SL3125-7MB?

The 5SL6120-7 is the closest functional peer — same 1-pole C-curve form factor, same 18 mm width and 76 mm depth, but rated at 6 kA breaking capacity instead of 4.5 kA. It drops into the same panel footprint without rewiring.

Will the 5SL3125-7MB fit a panel designed for the 5SL6120-7?

Yes, the 5SL3125-7MB shares the same 18 mm width, 76 mm depth, and 90 mm height as the 5SL6120-7. It mounts on the same DIN rail and occupies the same modular space.

Where can I buy the 5SL3125-7MB and how is it quoted?

The 5SL3125-7MB is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
5SL3125-7MB