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Siemens 5SY7403-8 — 4-Pole MCB (DIN Rail)

Siemens 5SY7403-8 SENTRON MCB, 4P D-Curve 3A, 15kA IEC

MPN5SY7403-8
Active

Siemens SENTRON miniature circuit breaker, 4-pole D-curve, 3 A rated current, 400 V AC, 15 kA breaking capacity per EN 60898, 40 kA per IEC 60947-2.

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

Specifications

5SY7403-8 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY7403-8 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC400 V
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
Voltage typeAC
5SY7403-8 — Protection
ParameterValue
Tripping characteristic (trip curve)D
Rated breaking capacity (Icn), per EN 6089815 kA
Rated breaking capacity, per IEC 60947-240 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
5SY7403-8 — 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
5SY7403-8 — 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
5SY7403-8 — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

4-pole D-curve MCB for high-inrush loads

At 400 V AC (rated voltage) and 440 V AC multi-phase operation, it covers standard three-phase industrial supply. Breaking capacity is 15 kA per EN 60898 and 40 kA per IEC 60947-2, with 15 kA at DC per IEC 60947-2 and 5 kA per UL 1077 / CSA C22.2 No. 235. The 5 kA UL figure confirms suitability for North American control-panel applications under UL 508A.

DIN-rail integration and environment

Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — adequate for machine-mounted panels on pumps or conveyors. Halogen-free and silicon-free construction, sealable (lockable) for isolation lockout/tagout.

Compliance documentation

The 5SY7403-8 carries IEC 60898 and IEC 60947-2 ratings, plus UL 1077 and CSA C22.2 No. 235 supplementary protection recognition. The SENTRON series is RoHS and REACH compliant. Standard documentation includes the EU Declaration of Conformity, manufacturer test certificates, and the product datasheet with time-current curves.

Frequently asked questions

Where can I buy 5SY7403-8 and how do I get a price?

The 5SY7403-8 is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing.

What is the breaking capacity of 5SY7403-8?

15 kA per EN 60898, 40 kA per IEC 60947-2 at 400 V AC, and 15 kA at DC per IEC 60947-2. UL 1077 / CSA rating is 5 kA.

What compliance documentation does Siemens provide for 5SY7403-8?

The SENTRON series is RoHS and REACH compliant. Documentation includes EU Declaration of Conformity, manufacturer test certificates, and the product datasheet with time-current curves.

MPN
5SY7403-8