Skip to main content
Log in
Siemens 5SL3550-7 — 1-Pole MCB (DIN Rail)

Siemens 5SL3550-7 SENTRON MCB, 50 A, C-Curve, 1P+N, 36 mm

MPN5SL3550-7

Siemens SENTRON 5SL3550-7 miniature circuit breaker, 1P+N, C-curve, 50 A, 230 V AC, 4.5 kA (EN 60898) / 5 kA (IEC 60947-2), 2 MW, IP20, halogen-free.

Siemens 5SL3550-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL3550-7 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles2
Pole design1P+N
Application suitabilityResidential buildings/infrastructure
5SL3550-7 — Electrical & Protection
ParameterValue
Tripping characteristic classC
Energy limitation class3
Overvoltage categoryIII
5SL3550-7 — Mounting & Connection
ParameterValue
Mounting positionany
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Modular width units2
Torque, min.-40 °C
Torque, max.75 °C
SealableYes
5SL3550-7 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree2
Halogen-freeYes
Silicone-freeYes

Product details

Siemens 5SL3550-7 SENTRON MCB – 50 A, C-Curve, 1P+N

The 4.5 kA breaking capacity per EN 60898 covers most domestic fault levels; the 5 kA per IEC 60947-2 gives a second reference for industrial coordination studies.

Temperature derating — the number that decides the real ampacity

At 40 °C the breaker is good for 46.97 A; at 45 °C it drops to 45 A; at 55 °C it is 42.01 A. Size the upstream conductor and load accordingly.

Mounting position is any, and with connected conductors the IP20 protection applies. The neutral pole is switched internally, so no separate neutral bar connection is needed for the load side — just the incoming neutral lands on the breaker's neutral terminal.

Frequently asked questions

What is the breaking capacity of the 5SL3550-7?

4.5 kA per EN 60898 and 5 kA per IEC 60947-2. The EN figure is the one typically used for domestic final circuits; the IEC figure is for industrial coordination studies.

What is the 5SL3550-7 used for?

It is a miniature circuit breaker for single-phase 230 V AC final subcircuits in residential buildings and infrastructure. The C-curve handles moderate inrush from lighting banks, small motors, and transformers.

Where can I buy the 5SL3550-7?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
5SL3550-7