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Siemens 5SY8402-7 — 4-Pole MCB (DIN Rail)

Siemens 5SY8402-7 SENTRON MCB, 4P, C-curve, 70 kA IEC

MPN5SY8402-7
Active

Siemens SENTRON 5SY8402-7 miniature circuit breaker, 4-pole, C-tripping characteristic, 70 kA at 400 V AC per IEC 60947-2, 72 mm wide, 76 mm deep.

Siemens 5SY8402-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY8402-7 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY8402-7 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated voltage, AC (multi-phase)440 V
5SY8402-7 — Protection
ParameterValue
Tripping characteristic (trip curve)C
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
5SY8402-7 — 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
5SY8402-7 — 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
5SY8402-7 — Performance
ParameterValue
Power loss per pole, AC (hot state, at In)1.2 W

Product details

The Siemens 5SY8402-7 is a 4-pole miniature circuit breaker from the SENTRON family, rated with a C tripping characteristic and a breaking capacity of 70 kA at 400 V AC per IEC 60947-2. It also carries a UL 1077 listing for 5 kA at 480 V AC, making it suitable for both IEC and North American panel designs.

Temperature derating is built into the design: the breaker is rated for ambient conditions up to 95% humidity at 55 °C, 55% at 70 °C, and 35% at 75 °C. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) confirms it holds up on conveyor lines or compressor skids.

Frequently asked questions

What is the 5SY8402-7's depth?

The depth is 76 mm, with an installation depth of 70 mm behind the panel.

Will 5SY8402-7 drop into a panel specified around 5SY4140-7 without rewiring?

Both are 4-pole SENTRON MCBs on the same DIN-rail footprint (4 modular units wide, 72 mm). The 5SY8402-7 has a higher breaking capacity (70 kA vs the 5SY4140-7's rating), so it can replace the lower-rated unit directly as long as the fault current at the panel does not exceed the 5SY4140-7's original rating — meaning no rewiring needed for the same application, but verify the available fault current.

MPN
5SY8402-7