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Siemens 5SY8250-8 — 2-Pole MCB (DIN Rail)

Siemens 5SY8250-8 SENTRON MCB, 2P, D Curve, 50 A, 20 kA

MPN5SY8250-8
Active

Siemens SENTRON 5SY8250-8, 2-pole miniature circuit breaker, D characteristic, 50 A rated current, 20 kA breaking capacity per IEC 60947-2, 440 V AC.

Siemens 5SY8250-8 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

5SY8250-8 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentMechanical engineering / industry
5SY8250-8 — Electrical
ParameterValue
Number of poles2
5SY8250-8 — Protection
ParameterValue
Tripping characteristic classD
Overvoltage categoryIII
5SY8250-8 — Mechanical
ParameterValue
Modular width units2
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Min.-40 °C
Max.75 °C
Protection degree (IP)IP20, with connected conductors
5SY8250-8 — Environmental
ParameterValue
Pollution degree3

Product details

What this 50 A D-curve MCB does in a panel

For DC circuits, the same breaker is rated 15 kA per the same standard. If you're specifying for a UL 489 panel, note the UL 1077 / CSA C22.2 No. 235 rating is 5 kA — that's the listing for supplementary protection, not branch-circuit primary. Check which code cycle governs your install. Thermal derating is published: full 50 A holds at 45 °C ambient, drops to 48.75 A at 50 °C, and 47.45 A at 55 °C. That's a straight line — no surprise roll-off if the panel runs warm.

DIN-rail fit and wiring

Width is 36 mm — two modular units on a standard DIN rail. Mounting position is unrestricted, so you can lay it sideways in a shallow gland plate if needed. IP20 with connected conductors — finger-safe once wired, but not sealed against washdown. Sealable option is present — you can lock the toggle in the off position for lockout/tagout without an external hasp. Touch protection is built in. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5 to 25 Hz and 50 m/s² at 25 to 150 Hz, so it holds up on a machine frame or near a large drive.

Frequently asked questions

What is 5SY8250-8's breaking capacity under IEC 60947-2?

20 kA at 440 V AC for multi-phase operation, and 15 kA for DC circuits under the same standard. For UL 1077 / CSA C22.2 No. 235 supplementary protection, the rating is 5 kA.

Will 5SY8250-8 drop into a panel specified around 5SY7210-7CC without rewiring?

Both are 2-pole SENTRON MCBs on a 36 mm footprint, so the mechanical fit is the same. The key difference is the tripping characteristic: 5SY8250-8 uses a D curve (high inrush tolerance), while 5SY7210-7CC uses a different curve. Verify the load type — if the original design needed a D curve for motor starting, the 5SY8250-8 is a direct functional match. If the original used a B or C curve, the trip coordination changes.

What compliance documentation does this brand provide for 5SY8250-8?

The breaker carries IEC 60947-2 ratings, UL 1077 and CSA C22.2 No. 235 listings, and is designated per IEC 81346-2 and DIN EN 61346-2 as function F. The housing is halogen-free and silicon-free. Standard Siemens SENTRON documentation includes a CE declaration and RoHS/REACH compliance statements — available from the manufacturer or through your distributor upon request.

MPN
5SY8250-8