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Siemens 5SY6450-8 — 4-Pole MCB (DIN Rail)

Siemens 5SY6450-8 SENTRON MCB, 4P D 50 A, 6/10 kA

MPN5SY6450-8

Siemens SENTRON 5SY6 series, miniature circuit breaker (MCB), 4-pole, D tripping characteristic, 50 A rated current at 400 V AC, 6 kA per EN 60898 / 10 kA per IEC 60947-2, 4 MW width units, IP20.

$604.96Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5SY6450-8 — Identification
ParameterValue
Type / order code5SY6
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY6450-8 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC400 V
Rated current (In), AC50 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
Rated voltage, DC (max.)72 V
Voltage typeAC
Rated frequency50/60 Hz
5SY6450-8 — Protection
ParameterValue
Tripping characteristic (trip curve)D
Rated breaking capacity (Icn), per EN 608986 kA
Rated breaking capacity, per IEC 60947-210 kA
Breaking capacity, AC (UL 1077 / CSA C22.2 No.235)5 kA
Overvoltage categoryIII
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SY6450-8 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
SealableYes
5SY6450-8 — 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
5SY6450-8 — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

What this 4-pole D-curve 50 A MCB covers

The Siemens 5SY6450-8 is a SENTRON 5SY6 miniature circuit breaker rated 50 A at 400 V AC, 4 poles, with a D tripping characteristic. Breaking capacity is 6 kA per EN 60898 and 10 kA per IEC 60947-2, with a 5 kA interrupting rating per UL 1077 / CSA C22.2 No.235 for North American panels. It also carries a 15 kA DC rating per IEC 60947-2 at 72 V DC max, useful for string-level solar combiner boxes or battery circuits.

Mounts via quick-assembly system (DIN rail) in any position. Occupies 4 width units (72 mm wide, 90 mm tall, 76 mm deep, 70 mm installation depth). Touch protection is built in; sealable for tamper-proofing.

Rated for ambient -25 to +55 °C operating, -40 to +75 °C storage. Halogen-free and silicon-free construction. Overvoltage category III. Humidity tolerance: 95% at 55 °C, derating to 35% at 75 °C. Suitable for mechanical engineering and industrial environments per the manufacturer's designation.

Frequently asked questions

What is the breaking capacity of 5SY6450-8?

6 kA per EN 60898, 10 kA per IEC 60947-2 at 400 V AC, and 5 kA per UL 1077 / CSA C22.2 No.235. For DC applications it is rated 15 kA per IEC 60947-2 at 72 V DC max.

Where can I buy 5SY6450-8?

This part is available to order through independent industrial-automation distribution. Submit an RFQ for current availability, lead time, and pricing — confirmed at quote time, not listed here.

What does the D-curve mean on this breaker?

The D tripping characteristic allows magnetic trip at 10–20× rated current (500–1000 A for this 50 A unit), designed for loads with high inrush like motors, transformers, or welding equipment where a B or C curve would nuisance-trip.

MPN
5SY6450-8