Skip to main content
Log in
Siemens 5SL4440-8 — 4-Pole MCB (DIN Rail)

Siemens 5SL4440-8 SENTRON MCB, 4P, 40 A, D Curve, 10 kA

MPN5SL4440-8
Active

Siemens SENTRON 5SL4440-8, 4-pole miniature circuit breaker, 40 A rated current, D tripping characteristic, 10 kA breaking capacity per EN 60898, 400 V AC.

Siemens 5SL4440-8 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL4440-8 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityResidential buildings/infrastructure
5SL4440-8 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC40 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, DC (max.)72 V
Voltage typeAC
5SL4440-8 — Protection
ParameterValue
Tripping characteristic (trip curve)D
Rated breaking capacity (Icn), per EN 6089810 kA
Rated breaking capacity, per IEC 60947-210 kA
Energy limitation class3
Overvoltage categoryIII
Pollution degree2
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SL4440-8 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Tightening torque, max.75 °C
Tightening torque, min.-40 °C
SealableYes
5SL4440-8 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of ambient temperature (derating)+55 °C, max. 95% humidity

Product details

Ratings that matter for panel fit

The 5SL4440-8: The 40 A rating holds at 30 °C ambient; at 40 °C it derates to 37.89 A, and at 55 °C to 34.47 A. Overvoltage category III (distribution-level) and pollution degree 2 suit it for fixed installations inside a panel.

Snap-on mounting to DIN rail, any position. IP20 with connected conductors — protected against finger contact, not washdown. Sealable, halogen-free, silicon-free. Neutral conductor switching is not integrated; the 4-pole unit switches all four poles, so plan for a separate neutral bar if the application requires it.

Frequently asked questions

What is the breaking capacity of 5SL4440-8?

10 kA per both EN 60898 and IEC 60947-2, at 400 V AC.

What does the D tripping characteristic mean on this MCB?

The D curve allows a higher inrush hold — typically 10–20× rated current — so it suits motor, transformer, or welding loads that draw a heavy start-up spike without tripping.

Where can I buy 5SL4440-8?

Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.

MPN
5SL4440-8