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Siemens 5SL4350-8 — 3-Pole MCB (DIN Rail)

Siemens 5SL4350-8 SENTRON MCB, D Curve, 3P, 50 A, 10 kA

MPN5SL4350-8
Active

Siemens SENTRON 5SL4350-8, 3-pole miniature circuit breaker, D characteristic, 50 A, 400 V AC, 10 kA breaking capacity per EN 60898.

Siemens 5SL4350-8 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL4350-8 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Suitability for operationResidential buildings/infrastructure
5SL4350-8 — Protection
ParameterValue
Tripping characteristic (curve)D
Breaking capacity per EN 6089810 kA
Breaking capacity per IEC 60947-210 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Energy limitation class3
Pollution degree2
5SL4350-8 — Electrical
ParameterValue
Rated current (AC)50 A
Rated voltage (AC, multi-phase)440 V
5SL4350-8 — Mechanical
ParameterValue
Modular width units3
Mounting positionany
Width54 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Terminal tightening torque, max.75 °C
Terminal tightening torque, min.-40 °C
SealableYes
5SL4350-8 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of surrounding temperature+55 °C, max. 95% humidity

Product details

Three poles, rated 50 A at 400 V AC, with a 10 kA breaking capacity per EN 60898 and IEC 60947-2.

The 50 A rating holds at 30 °C ambient; derate to 47.36 A at 40 °C and 43.09 A at 55 °C. The 3-module width (54 mm) and 76 mm depth fit standard 18 mm DIN-rail enclosures; the IP20 with connected conductors rating means it's protected against finger contact once wired, but not against dust ingress — keep it inside the panel.

Panel fit and footprint

Installation depth 70 mm. Sealable, halogen-free, silicon-free — relevant if the panel spec calls for low-halogen materials or a sealed cover to prevent tampering. Touch protection built in. Mounting position unrestricted, so it works horizontally or vertically in a tight cabinet.

Frequently asked questions

What is the breaking capacity of the 5SL4350-8?

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

What does the D tripping characteristic mean for this MCB?

The D curve allows brief inrush currents several times the rated 50 A without tripping, so it suits motor, transformer, or welding loads that pull a heavy start surge.

Where can I buy the 5SL4350-8?

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

Will the 5SL4350-8 drop into a panel specified for the 5SL6550-7BB?

Both are 3-pole SENTRON MCBs on the same DIN-rail footprint, so the physical swap is straightforward. The 5SL4350-8 is rated 50 A D-curve; the 5SL6550-7BB is a different rating or curve — verify the branch circuit's load and coordination before substituting.

MPN
5SL4350-8