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Siemens 5SY6440-7 — 4-Pole MCB (DIN Rail)

Siemens 5SY6440-7 SENTRON MCB, 4P C-Curve, 6 kA

MPN5SY6440-7
Active

Siemens SENTRON 5SY6440-7, 4-pole miniature circuit breaker, C-trip characteristic, 6 kA breaking capacity per IEC 60898, 10 kA per IEC 60947-2, 400 V AC, width 72 mm (4 MW).

Siemens 5SY6440-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY6440-7 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY6440-7 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated voltage, AC (multi-phase)440 V
5SY6440-7 — Protection
ParameterValue
Tripping characteristic (trip curve)C
Energy limitation class3
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
5SY6440-7 — 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
5SY6440-7 — 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
5SY6440-7 — Performance
ParameterValue
Power loss per pole, AC (hot state, at In)3.5 W

Product details

Panel fit and trip curve

The Siemens 5SY6440-7 is a 4-pole SENTRON miniature circuit breaker (MCB) with a C-trip characteristic, rated 6 kA breaking capacity per IEC 60898-1 and 10 kA per IEC 60947-2.

Breaking capacity and dual-standard compliance

Rated breaking capacity is 6 kA at 400 V AC per IEC 60898-1 and 10 kA at 400 V AC per IEC 60947-2. At DC, the unit is rated 15 kA at 60 V (max 72 V) per IEC 60947-2. For UL 1077 / CSA C22.2 No.235 applications, the breaking capacity is 5 kA.

Mounting and environmental specs

The 72 mm width equals 4 modular units, matching the standard grid spacing of most enclosure gland plates. The IP20 rating applies only with connected conductors; the enclosure itself is not sealed against dust ingress. Both top and bottom terminals accept combined (busbar + wire) termination, and the unit is sealable for tamper-evident installations.

Frequently asked questions

How do I get current pricing and availability for 5SY6440-7?

Submit an RFQ through this listing. Pricing and stock are confirmed at quote time through independent distribution channels.

Will 5SY6440-7 drop into a panel that was specified around 5SY4140-7 without rewiring?

Both are 4-pole SENTRON MCBs with the same 72 mm width (4 MW) and DIN-rail mounting, so the mechanical fit is identical. The 5SY6440-7 carries a C-trip characteristic, while the 5SY4140-7 is a B-curve variant — the trip threshold differs, but the footprint and terminal layout are the same.

What compliance documentation does Siemens provide for 5SY6440-7?

The MCB is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077 / CSA C22.2 No.235. It is halogen-free and silicon-free. Standard documentation includes the declaration of conformity and a datasheet covering the listed ratings.

MPN
5SY6440-7