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Siemens 5SY8450-7 — Miniature Circuit Breakers (MCB)

Siemens 5SY8450-7 SENTRON MCB, 4P C-Curve 50 A, 25 kA

MPN5SY8450-7
Active

Siemens SENTRON 5SY8450-7, 4-pole miniature circuit breaker, C-curve, 50 A rated, 25 kA breaking capacity per IEC 60947-2, 440 V AC.

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

5SY8450-7 — Ratings
ParameterValue
Overvoltage categoryIII
5SY8450-7 — Mechanical
ParameterValue
Width72 mm
Height90 mm
Depth76 mm

Product details

For DC circuits it's rated 15 kA at 72 V, so it handles battery-bank or rectifier faults in the same panel. Rated current is 50 A at 45 °C; at 55 °C it derates to 47.85 A, and at 50 °C it's 48.95 A, so plan the load at the panel's ambient temperature, not the breaker's label.

The quick-assembly fastening system means it clips onto the DIN rail without tools and the combined top/bottom terminals accept both busbar and wire — no need to swap terminal types between incoming and outgoing. IP20 with connected conductors — fine inside a closed enclosure, not for wet areas. Sealable, halogen-free, silicon-free — relevant if the panel goes into a food-processing or semiconductor fab environment where outgassing or tamper-proofing is specified. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz, so it holds up on a machine frame or conveyor line.

Designed for mechanical engineering and industry per the manufacturer's suitability statement. The product designation follows EN 61346-2 and IEC 81346-2 function code F (protective device). Touch protection is built in — no exposed live parts when wired. Humidity limits: 95% up to 55 °C, 55% up to 70 °C, 35% up to 75 °C. The neutral conductor is not switched (solid neutral through the 4-pole frame).

Frequently asked questions

Who supplies 5SY8450-7 and how is it quoted for volume purchases?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or price lists are published here.

What is 5SY8450-7's listed depth and width?

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

Will 5SY8450-7 drop into a panel specified around 5SY4140-7 without rewiring?

Both are 4-pole SENTRON MCBs on the same DIN-rail footprint, so the mechanical fit is the same. The difference is the rating: 5SY8450-7 is a 50 A C-curve, while 5SY4140-7 is a lower-current variant. If the existing panel's busbar and wire are sized for 50 A, it drops in; if the circuit was designed for a smaller breaker, the wire and upstream protection must be checked first.

What compliance documentation does Siemens provide for 5SY8450-7?

The part carries IEC 60947-2 ratings (25 kA breaking capacity at 440 V AC, 15 kA at 72 V DC) and is designed to EN 61346-2 / IEC 81346-2 function code F. It is halogen-free and silicon-free. Specific RoHS/REACH/UL declarations should be requested at quote time — the evidence does not list those certificates directly.

MPN
5SY8450-7