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Siemens 5SY4145-7 — 1-Pole MCB (DIN Rail)

Siemens SENTRON 5SY4145-7 Miniature Circuit Breaker, C-Curve

MPN5SY4145-7
Active

Siemens SENTRON miniature circuit breaker, 5SY4145-7, 1-pole, C-curve, 10 kA per EN 60898 / 15 kA per IEC 60947-2, 400 VAC / 60 VDC, 18 mm width, IP20.

$114.73Ref. price · indicative, final on quote
Siemens 5SY4145-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY4145-7 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles1
Pole design1P
Application suitabilityMechanical engineering / industry
5SY4145-7 — Electrical & Protection
ParameterValue
Tripping characteristic classC
Energy limitation class3
Overvoltage categoryIII
5SY4145-7 — Mounting & Connection
ParameterValue
Mounting positionany
Fastening methodQuick assembly system
Combined terminal, topYes
Combined terminal, bottomYes
Width18 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Modular width units1
Torque, min.-40 °C
Torque, max.75 °C
SealableYes
5SY4145-7 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree3
Halogen-freeYes
Silicone-freeYes

Product details

It carries a 10 kA interrupting rating per EN 60898 and a 15 kA rating per IEC 60947-2, with a 5 kA rating under UL 1077. Rated operational voltage is 400 VAC (440 VAC multi- or single-phase) and 60 VDC (max 72 VDC). The 18 mm width takes one modular unit on a DIN rail, and the unit is sealable with a quick-assembly fastening system.

The 10 kA (EN 60898) and 15 kA (IEC 60947-2) ratings define the maximum prospective short-circuit current the breaker can safely interrupt; the lower UL 1077 figure (5 kA) applies in North American supplementary protection applications. The 400 VAC / 60 VDC voltage ratings cover most three-phase and DC control circuits. The 18 mm width (one modular unit) is the standard DIN-rail footprint for a 1-pole MCB — critical when filling a crowded panel.

Mounting and integration notes

The quick-assembly fastening system allows snap-on installation without tools. The neutral conductor is not switched (1-pole design). The installation depth is 70 mm, and the overall depth is 76 mm — allow clearance for wiring and enclosure door. The unit occupies one modular width unit (18 mm).

Frequently asked questions

What is the closest functional second-source — 5SL4363-7?

The 5SL4363-7 is a different SENTRON variant with a different tripping characteristic or rating. The 5SY4145-7 is a C-curve 1-pole unit; the 5SL series typically uses a different characteristic. They share the same 18 mm width and DIN-rail mounting, but verify the specific rating and curve before substituting. The 5SY4145-7 is the part specified here.

What is 5SY4145-7's listed depth?

The overall depth is 76 mm; the installation depth (behind the panel face) is 70 mm.

What is 5SY4145-7's listed width?

The width is 18 mm, which is one modular unit on a standard DIN rail.

Will 5SY4145-7 drop into a panel specified around 5SL4363-7 without rewiring?

Both are 18 mm wide 1-pole DIN-rail units, so physical fit is the same. However, the tripping characteristic and interrupting ratings may differ — the 5SY4145-7 is a C-curve with 10/15 kA ratings. Verify the existing panel's short-circuit rating and load type before swapping. No rewiring should be needed if the terminal arrangement matches.

What compliance documentation does this brand provide for 5SY4145-7?

The part is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077. It is halogen-free and silicon-free. Standard compliance documentation (declaration of conformity, RoHS, REACH) is available from Siemens upon request.

MPN
5SY4145-7