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Siemens 5SY7404-8 — 4-Pole MCB (DIN Rail)

Siemens 5SY7404-8 SENTRON MCB, 4P D 4A, 15/40 kA

MPN5SY7404-8
Active

Siemens SENTRON 5SY7 series, 4-pole miniature circuit breaker, D tripping characteristic, 4 A rated current, 400 V AC, 15 kA (EN 60898) / 40 kA (IEC 60947-2) breaking capacity, 72 mm wide, 76 mm deep, 90 mm high.

Siemens 5SY7404-8 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY7404-8 — Identification
ParameterValue
Type / order code5SY7
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY7404-8 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC400 V
Rated current (In), AC4 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
Rated voltage, DC (max.)72 V
Voltage typeAC
Rated frequency50/60 Hz
5SY7404-8 — 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
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SY7404-8 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
SealableYes
5SY7404-8 — 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
5SY7404-8 — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

What this 4-pole D-curve MCB does on the line

Rated 400 V AC, it handles line-to-line loads on a 3-phase system with neutral. The 72 V DC maximum rating (per pole) means it can also serve in DC control circuits or battery-backed subsystems, but the DC breaking capacity drops to 15 kA per IEC 60947-2 — still adequate for most 72 V DC distribution.

Wire range accepts 0.75 to 35 mm² solid or stranded, which covers everything from 1.5 mm² control wiring up to 10 mm² feeder tails. Combined terminals top and bottom mean you can bus-bar multiple breakers without extra accessories. Mount in any position; ambient temperature range -40 to +70 °C. Touch protection is built in (fingertip-safe terminals).

Frequently asked questions

What is the breaking capacity of the 5SY7404-8?

15 kA per EN 60898 and 40 kA per IEC 60947-2 at 400 V AC. At 72 V DC the breaking capacity is 15 kA per IEC 60947-2.

What wire sizes does the 5SY7404-8 accept?

Solid and stranded conductors from 0.75 mm² up to 35 mm².

Where can I buy the 5SY7404-8?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
5SY7404-8