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Siemens 5SY6450-6 — Miniature Circuit Breakers (MCB)

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)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

5SY6450-6 — Ratings
ParameterValue
Overvoltage categoryIII
5SY6450-6 — Mechanical
ParameterValue
Width72 mm
Height90 mm
Depth76 mm

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