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Siemens 5SY7440-7 — 4-Pole MCB (DIN Rail)

Siemens 5SY7440-7 SENTRON MCB, 4P C-curve 40 A, 15/20 kA

MPN5SY7440-7
Active

Siemens SENTRON 5SY7440-7 miniature circuit breaker, 4-pole, C-curve, 40 A rated at AC, breaking capacity 15 kA (EN 60898) / 20 kA (IEC 60947-2), 4 MW units, IP20.

Siemens 5SY7440-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY7440-7 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY7440-7 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated voltage, AC (multi-phase)440 V
5SY7440-7 — Protection
ParameterValue
Tripping characteristic (trip curve)C
Energy limitation class3
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
5SY7440-7 — 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
5SY7440-7 — 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
5SY7440-7 — Performance
ParameterValue
Power loss per pole, AC (hot state, at In)3.5 W

Product details

What this 4-pole C-curve 40 A MCB does on the rail

At DC (IEC 60947-2) it's rated 15 kA.

Rated current holds at 40 A up to 35 °C ambient. Above that it derates: 38.4 A at 40 °C, 37.6 A at 45 °C, 36.76 A at 50 °C, 35.92 A at 55 °C, and 35.04 A at 60 °C. The surrounding temperature influence curve caps at 95 % RH up to 55 °C, then drops to 55 % RH at 70 °C and 35 % RH at 75 °C.

Compliance and environmental specs

Halogen-free and silicon-free construction, sealable, with a degree of pollution 3 rating and overvoltage category III. Suitability listed for mechanical engineering and industry applications. Energy limitation class 3; neutral conductor is not switched. Combined terminal top and bottom are present.

Frequently asked questions

Where can I buy 5SY7440-7 and how do I get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing.

Will 5SY7440-7 drop into a panel that was specified around 5SY4140-7 without rewiring?

Both are 4-pole SENTRON MCBs in the same 4 MW footprint (72 mm wide), so the mechanical fit is identical. The 5SY7440-7 is a 40 A C-curve; the 5SY4140-7 is a different rating — verify the load current and trip characteristic before swapping.

What compliance documentation does Siemens provide for 5SY7440-7?

The breaker is halogen-free and silicon-free. It carries ratings per EN 60898 and IEC 60947-2, and is designed for overvoltage category III and pollution degree 3 environments.

MPN
5SY7440-7