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Siemens 5SY8425-8 — 4-Pole MCB (DIN Rail)

Siemens 5SY8425-8 SENTRON MCB, 4P, 25 A, D Curve, 30 kA IEC

MPN5SY8425-8
Active

Siemens SENTRON, miniature circuit breaker, 5SY8425-8, 4-pole, 25 A rated current, D tripping characteristic, 30 kA breaking capacity per IEC 60947-2, IP20 with connected conductors.

Siemens 5SY8425-8 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY8425-8 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY8425-8 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC25 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
Voltage typeAC
5SY8425-8 — Protection
ParameterValue
Tripping characteristic (trip curve)D
Rated breaking capacity, per IEC 60947-230 kA
Breaking capacity, AC (UL 1077 / CSA C22.2 No.235)5 kA
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SY8425-8 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Fastening / mounting methodQuick assembly system
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
Tightening torque, max.75 °C
Tightening torque, min.-40 °C
SealableYes
5SY8425-8 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of ambient temperature (derating)max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C

Product details

Siemens 5SY8425-8 SENTRON MCB — 4-pole, 25 A, D curve, 30 kA

The Siemens 5SY8425-8 is a 4-pole miniature circuit breaker from the SENTRON family, rated 25 A at AC with a D tripping characteristic and a breaking capacity of 30 kA per IEC 60947-2.

Rated 25 A at 45 °C ambient, the 5SY8425-8 derates to 24.38 A at 50 °C and 23.72 A at 55 °C — per the datasheet, the thermal-magnetic trip element is calibrated to the 45 °C reference. The DC breaking capacity is 15 kA per IEC 60947-2, which covers most industrial DC bus applications; the UL 1077 / CSA C22.2 No.235 rating is 5 kA, so for North American supplementary protection installations the available fault current must stay under that limit.

Touch protection is integrated per the product feature listing.

Vibration resistance per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz. The sealable design allows lockout/tagout in safety circuits.

Frequently asked questions

Where can I buy 5SY8425-8?

The 5SY8425-8 is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.

What is the breaking capacity of 5SY8425-8?

30 kA per IEC 60947-2 at AC, 15 kA per IEC 60947-2 at DC, and 5 kA per UL 1077 and CSA C22.2 No.235.

What is the tripping characteristic of 5SY8425-8?

D curve — designed for loads with high inrush current such as motors, transformers, and welding equipment.

What compliance documentation does Siemens provide for 5SY8425-8?

The breaker carries IEC 60947-2, UL 1077, and CSA C22.2 No.235 ratings. It is halogen-free and silicon-free. The specific RoHS and REACH declarations are available from Siemens documentation for the SENTRON 5SY8 series.

MPN
5SY8425-8