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Siemens 5SY6450-6 — 4-Pole MCB (DIN Rail)

Siemens 5SY6450-6 SENTRON MCB, 4P, 50A, B-Curve, 6kA/10kA

MPN5SY6450-6
Active

Siemens SENTRON 5SY6450-6, 4-pole miniature circuit breaker, 50 A rated, B tripping characteristic, 6 kA (EN 60898) / 10 kA (IEC 60947-2) breaking capacity, 72 mm wide.

Siemens 5SY6450-6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY6450-6 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY6450-6 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC50 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
5SY6450-6 — Protection
ParameterValue
Tripping characteristic (trip curve)B
Energy limitation class3
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
5SY6450-6 — 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
5SY6450-6 — 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
5SY6450-6 — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

Siemens SENTRON 5SY6450-6 — 50 A, 4-pole, B-curve MCB

It carries a 6 kA breaking capacity per EN 60898-1 and a 10 kA rating per IEC 60947-2 / UL 1077, so it handles fault currents up to those levels without upstream coordination issues.

Derating and ambient conditions

Rated current holds at 50 A up to 35 °C, then steps down: 48 A at 40 °C, 47 A at 45 °C, 45.95 A at 50 °C, and 44.9 A at 55 °C. Humidity limits are 95% up to 55 °C, dropping to 35% at 75 °C; that's fine for most indoor industrial enclosures but not for direct washdown zones.

Mounts in any position — no orientation restrictions for vertical or horizontal DIN-rail layouts. The quick-assembly fastening method clips onto the rail without tools.

Frequently asked questions

How do I get current pricing and availability for 5SY6450-6?

Submit an RFQ through the storefront. Availability and current pricing are confirmed at quote time through independent distribution channels.

What is 5SY6450-6's listed depth and width?

Depth is 76 mm, width is 72 mm (4 modular units), height is 90 mm. Installation depth is 70 mm.

Will 5SY6450-6 drop into a panel specified around 5SY4140-7 without rewiring?

Both are 4-pole SENTRON MCBs on the same DIN-rail footprint (4 MW = 72 mm wide), so the mechanical fit is identical. The difference is rating: 5SY6450-6 is 50 A B-curve; 5SY4140-7 is 40 A C-curve. If the circuit is sized for 40 A C-curve, dropping in a 50 A B-curve changes both the overload threshold and the magnetic trip point — verify the load and cable sizing before swapping.

What compliance documentation does 5SY6450-6 carry?

It is rated under IEC / EN 60898-1 and IEC / EN 60947-2 / UL 1077. Halogen-free and silicon-free. Overvoltage category III, pollution degree 3. The product is sealable for tamper-proof installations.

MPN
5SY6450-6