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Siemens 5SY5403-7 — 4-Pole MCB (DIN Rail)

Siemens 5SY5403-7 SENTRON MCB, 4P C-Curve 3A 10kA, 72mm

MPN5SY5403-7
Active

Siemens SENTRON 5SY5403-7 miniature circuit breaker, 4-pole, C-curve, 3 A rated, 10 kA breaking capacity per EN 60898, 72 mm width, IP20.

Siemens 5SY5403-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY5403-7 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityuniversal current
5SY5403-7 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC3 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
Voltage typeAC/DC
5SY5403-7 — Protection
ParameterValue
Tripping characteristic (trip curve)C
Rated breaking capacity (Icn), per EN 6089810 kA
Energy limitation class3
Overvoltage categoryII
Pollution degree2
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SY5403-7 — 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
5SY5403-7 — 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
5SY5403-7 — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

Rated for universal current (AC/DC) and marked IP20 with connected conductors, it mounts in any position via the quick-assembly system — standard DIN-rail clip-on.

Rating and derating

Derate to 2.86 A at 40 °C, 2.78 A at 45 °C, 2.71 A at 50 °C, 2.62 A at 55 °C, and 2.54 A at 60 °C. If the panel runs warm — say 50 °C inside a sealed enclosure — the actual continuous load should stay at or under 2.71 A to avoid nuisance tripping. For purely resistive loads a B-curve sibling would trip faster; for heavy motor starts a D-curve may be needed.

Physical fit and installation

Sealable design (can be locked in the OFF position) and touch protection are standard. The DC supply cord must observe polarity; AC can be fed from either side.

MPN
5SY5403-7