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Siemens 5SY4550-8 — 1-Pole MCB (DIN Rail)

Siemens 5SY4550-8 SENTRON MCB, 50 A, D Curve, 2-Pole, 10 kA

MPN5SY4550-8
Active

Siemens SENTRON 5SY4 series miniature circuit breaker, 5SY4550-8, 2-pole (1P+N), 50 A, D tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 230 V AC, IP20.

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

5SY4550-8 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles2
Application suitabilityMechanical engineering / industry
5SY4550-8 — Electrical & Protection
ParameterValue
Tripping characteristic classD
Rated value (EN 60898)10 kA
Overvoltage categoryIII
5SY4550-8 — Mounting & Connection
ParameterValue
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
SealableYes
5SY4550-8 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Halogen-freeYes
Silicone-freeYes

Product details

The Siemens 5SY4550-8 is a 2-pole (1P+N) miniature circuit breaker from the SENTRON 5SY4 family, rated 50 A with a D tripping characteristic. The 76 mm depth leaves clearance in shallow enclosures.

Rated voltage is 230 V AC; maximum DC voltage is 72 V, so it works in single-phase AC branch circuits and some DC control circuits. The 10 kA SCCR under EN 60898 is the standard for domestic/commercial distribution; the 15 kA rating under IEC 60947-2 gives you headroom for industrial installations with higher available fault current.

Snap-on DIN rail mounting (quick assembly system). Sealable cover is standard — useful for lockout/tagout on the 1P+N pole. Touch protection is built in.

Frequently asked questions

Where can I buy 5SY4550-8 and how do I get a price?

This part is sourced to order against an RFQ through independent distribution. Submit a request for quote (RFQ) and we will confirm availability and current pricing at that time.

Will 5SY4550-8 drop into a panel specified around 5SY6613-8 without rewiring?

Both are SENTRON MCBs on the same DIN-rail footprint (2 width units, 36 mm), but the 5SY6613-8 is a different rating and characteristic — verify the required current and trip curve before substituting. The mechanical fit is the same; the electrical specification may not be.

What compliance documentation does Siemens provide for 5SY4550-8?

The MCB carries approvals per EN 60898 and IEC 60947-2, plus UL 1077 and CSA C22.2 No.235 (5 kA rating). RoHS and REACH declarations are standard with Siemens industrial products; request them at quote time.

MPN
5SY4550-8