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Siemens 5SY7508-8 — 1-Pole MCB (DIN Rail)

Siemens 5SY7508-8 SENTRON MCB, 2-pole D-curve 8 A, 15/30 kA

MPN5SY7508-8
Active

Siemens SENTRON 5SY7 series, 5SY7508-8 miniature circuit breaker, 2-pole (1P+N), D tripping characteristic, 8 A rated, 15 kA (EN 60898) / 30 kA (IEC 60947-2) breaking capacity, 230 V AC / 72 V DC.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5SY7508-8 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles2
Application suitabilityMechanical engineering / industry
5SY7508-8 — Electrical & Protection
ParameterValue
Tripping characteristic classD
Rated value (EN 60898)15 kA
Overvoltage categoryIII
5SY7508-8 — Mounting & Connection
ParameterValue
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
SealableYes
5SY7508-8 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Halogen-freeYes
Silicone-freeYes

Product details

Siemens 5SY7508-8 — D-curve MCB for high-inrush industrial loads

At DC the maximum rated voltage is 72 V, with a 15 kA interrupting rating per IEC 60947-2. This is a 1P+N (2-pole) configuration — it switches both line and neutral, with the neutral pole not internally protected. The unit occupies 2 width units (36 mm) on a DIN rail, mounts in any position, and accepts conductors from 0.75 to 35 mm² solid or stranded. Terminal capacity that wide means it can handle both control-circuit tails and power-side feeds without a reducer.

The 15 kA rating under EN 60898 is the standard for domestic/commercial final circuits. The 30 kA under IEC 60947-2 is the industrial rating — that's the figure to use when coordinating with upstream switchgear in a panel. If your installation requires UL 1077 recognition, the part carries a 5 kA interrupting rating per UL 1077 and CSA C22.2 No.235. The D-curve (10–20× In magnetic trip) is the correct choice for loads with high inrush: small motors, power supplies, welding equipment.

Environmental and compliance documentation

The part is sealable, allowing panel builders to lock the setting to prevent unauthorized operation.

Frequently asked questions

What is the breaking capacity of the 5SY7508-8?

15 kA per EN 60898, 30 kA per IEC 60947-2 at 230 V AC, and 5 kA per UL 1077 / CSA C22.2 No.235. At DC (72 V max) the interrupting rating is 15 kA per IEC 60947-2.

What wire sizes does the 5SY7508-8 accept?

Solid and stranded conductors from 0.75 to 35 mm². The combined top and bottom terminals accept this full range, so no adapter is needed for mixed wire sizes.

Where can I buy the 5SY7508-8 and how is it quoted?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — we do not maintain speculative stock positions on this line.

Will the 5SY7508-8 drop into a panel specified for the 5SY3132-6?

Both are 2-pole SENTRON MCBs on the same DIN-rail footprint (36 mm width per 2 width units). The 5SY7508-8 is a D-curve 8 A device; the 5SY3132-6 is a different rating and characteristic. Mechanical fit is identical, but the electrical ratings differ — verify the load's inrush and fault current requirements before substituting.

MPN
5SY7508-8