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Siemens 5SL4450-6 — 4-Pole MCB (DIN Rail)

Siemens 5SL4450-6 SENTRON MCB, 4P, 50A, B Curve, 10kA

MPN5SL4450-6
Active

Siemens SENTRON 5SL4450-6 miniature circuit breaker, 4-pole, 50 A, B characteristic, 10 kA breaking capacity, 400 V AC.

Siemens 5SL4450-6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL4450-6 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityResidential buildings/infrastructure
5SL4450-6 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC50 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, DC (max.)72 V
Voltage typeAC
5SL4450-6 — Protection
ParameterValue
Tripping characteristic (trip curve)B
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
5SL4450-6 — 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
5SL4450-6 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of ambient temperature (derating)+55 °C, max. 95% humidity

Product details

Siemens 5SL4450-6 SENTRON MCB — 4-pole, 50 A, B curve, 10 kA

Thermal derating and ambient range

Rated 50 A at 30 °C; at 40 °C the continuous current drops to 47.36 A, at 45 °C to 46 A, and at 55 °C to 43.09 A.

Occupies 4 modular width units (72 mm wide, 90 mm high, 76 mm deep plus 70 mm installation depth). Snap-on DIN rail mount, any orientation. Sealable cover is standard — useful for utility-metering or tamper-proof installations. Halogen-free and silicon-free construction, so it meets clean-room and low-smoke specifications without additional conformal coating. Touch protection integrated; degree of pollution 2, overvoltage category III.

Frequently asked questions

Where can I buy 5SL4450-6 and get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time.

What is the breaking capacity of 5SL4450-6?

10 kA per EN 60898 and also 10 kA per IEC 60947-2 at 400 V AC. That covers standard residential and commercial fault levels without needing an upstream current-limiting device.

Will 5SL4450-6 drop into a panel specified around 5SL6550-7BB?

Both are 4-pole SENTRON MCBs on a DIN-rail footprint, but the 5SL6550-7BB is a higher-current variant with a different characteristic. The 5SL4450-6 is a 50 A B-curve unit; verify the load current and coordination study before substituting. Mechanical fit (4 MW, same rail) is identical.

MPN
5SL4450-6