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Siemens 5SY7550-8 — 1-Pole MCB (DIN Rail)

Siemens 5SY7550-8 SENTRON MCB, 2-pole 50A D-curve, 15kA

MPN5SY7550-8
Active

Siemens SENTRON 5SY7 series, 5SY7550-8 miniature circuit breaker, 2-pole (1P+N), 50 A rated current, D tripping characteristic, 15 kA breaking capacity per IEC 60898 / IEC 60947-2, 230 V AC rated voltage, 36 mm width.

Siemens 5SY7550-8 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

5SY7550-8 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles2
Application suitabilityMechanical engineering / industry
5SY7550-8 — Electrical & Protection
ParameterValue
Tripping characteristic classD
Rated value (EN 60898)15 kA
Overvoltage categoryIII
5SY7550-8 — Mounting & Connection
ParameterValue
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
SealableYes
5SY7550-8 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Halogen-freeYes
Silicone-freeYes

Product details

50 A D-curve MCB for industrial branch circuits

The Siemens 5SY7550-8 is a 2-pole (1P+N) miniature circuit breaker from the SENTRON 5SY7 series, rated at 50 A with a D tripping characteristic.

DIN-rail footprint and terminal capacity

The 5SY7550-8 occupies 36 mm width (2 width units) on the DIN rail, with a depth of 76 mm and height of 90 mm. Installation depth is 70 mm — account for this when planning gland-plate clearance and door swing in the enclosure. The terminals are sealable and touch-protected, meeting the requirements for panel builders who need to lock out unauthorized access after commissioning.

Environmental range and compliance

Ambient temperature range spans -40 °C to +75 °C, with humidity limits of 95% at 55 °C, derating to 35% at 75 °C. This covers unheated outdoor cabinets in cold climates as well as warm switchgear rooms. The part is classified per DIN EN 61346-2 and DIN EN 81346-2 as function F (protective device).

Frequently asked questions

What is the breaking capacity of 5SY7550-8?

The 5SY7550-8 has a 15 kA breaking capacity per IEC 60898 and IEC 60947-2 at 230 V AC. For UL 1077 / CSA C22.2 No. 235 applications, the rating is 5 kA.

What is the closest functional second-source to 5SY7550-8?

Within the same SENTRON family, the 5SY7140-8CC is a 2-pole 40 A D-curve MCB with the same 15 kA breaking capacity and identical DIN footprint. The 5SY7550-8 is the 50 A step up. Both share the same terminal range, mounting, and environmental specs, so a panel designed for one can accept the other without rewiring — only the overcurrent protection rating changes.

Will 5SY7550-8 drop into a panel specified around 5SY7140-8CC without rewiring?

Yes. Both breakers share the same 36 mm width, 76 mm depth, 90 mm height, DIN-rail mounting, and combined terminal design accepting 0.75–35 mm² conductors. The swap is mechanical and electrical — only the 50 A vs 40 A rating changes.

What compliance documentation does Siemens provide for 5SY7550-8?

The breaker carries ratings per IEC 60898, IEC 60947-2, UL 1077, and CSA C22.2 No. 235. It is halogen-free and silicon-free. Standard Siemens declarations of conformity (CE, UKCA) and RoHS/REACH documentation are available through the manufacturer.

How do I get current pricing and availability for 5SY7550-8?

This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer.

MPN
5SY7550-8