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Siemens 5SY8425-7 — 4-Pole MCB (DIN Rail)

Siemens 5SY8425-7 SENTRON MCB, 4P C-Char, 30kA IEC

MPN5SY8425-7
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Siemens SENTRON 5SY8425-7, 4-pole miniature circuit breaker, C tripping characteristic, 30 kA at 400 V AC per IEC 60947-2, 4 MW, IP20.

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

Specifications

5SY8425-7 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY8425-7 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated voltage, AC (multi-phase)440 V
5SY8425-7 — Protection
ParameterValue
Tripping characteristic (trip curve)C
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
5SY8425-7 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Fastening / mounting methodQuick assembly system
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
Tightening torque, max.75 °C
Tightening torque, min.-40 °C
SealableYes
5SY8425-7 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of ambient temperature (derating)max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C
5SY8425-7 — Performance
ParameterValue
Power loss per pole, AC (hot state, at In)2.2 W

Product details

Siemens 5SY8425-7 — 4-pole MCB with C characteristic, 30 kA breaking capacity

Its C tripping characteristic handles moderate inrush currents from motor starters and transformer loads, making it a standard choice for general-purpose power circuits. The 30 kA rated short-circuit breaking capacity at 400 V AC (per IEC 60947-2) means it can safely interrupt faults up to that level without upstream fusing — that's high-interrupt capacity for a 4-module-wide (72 mm) MCB, suited for high-fault installations like main distribution panels or industrial sub-distribution. Rated for 400 V AC (440 V multi- or single-phase) and 60 V DC (max 72 V DC).

Frequently asked questions

Will 5SY8425-7 drop into a panel specified around 5SY4140-7 without rewiring?

Both are 4-pole SENTRON MCBs on DIN rail with the same 72 mm width (4 MW). The 5SY8425-7 has a higher breaking capacity (30 kA vs the 5SY4140-7's lower rating) and a C characteristic versus the 5SY4140-7's B characteristic. It fits the same footprint and terminal layout, but the tripping curve difference may affect coordination — verify selectivity with downstream devices if replacing.

MPN
5SY8425-7