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

Siemens 5SY7404-8MA SENTRON MCB, 4A D-curve, 4-pole, 30kA

MPN5SY7404-8MA

Siemens SENTRON 5SY7404-8MA, miniature circuit breaker, 4 A, D tripping characteristic, 4-pole, 30 kA breaking capacity per IEC 60947-2, 400 V AC.

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

Specifications

5SY7404-8MA — Identification
ParameterValue
Type / order code5SY7MA
Brand nameSENTRON
Application suitabilityIndustry
5SY7404-8MA — 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
5SY7404-8MA — Protection
ParameterValue
Tripping characteristic (trip curve)D
Rated breaking capacity, per IEC 60947-230 kA
Overvoltage categoryIII
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SY7404-8MA — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
Tightening torque, max.31 lbf·in
Tightening torque, min.22 lbf·in
SealableYes
5SY7404-8MA — 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
5SY7404-8MA — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

What this 4-pole D-curve MCB is for

Occupies 4 width units (72 mm wide, 90 mm tall, 76 mm deep with 70 mm installation depth).

The D tripping characteristic is the key selector: it allows 10–20× rated current before magnetic trip, so it won't drop out on motor inrush or transformer energization. Rated 400 V AC for multi-phase operation, 440 V AC for single-phase or multi-phase use. Mechanical endurance is 10,000 switching cycles typical. The magnetic-only design means no thermal bimetal — it responds to overcurrent only, not overload; pair it with a separate overload relay for motor protection.

Frequently asked questions

How do I get current pricing and availability for 5SY7404-8MA?

Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels.

What compliance documentation does Siemens provide for 5SY7404-8MA?

The part carries IEC 60947-2 certification for the 30 kA breaking capacity rating. It is halogen-free and silicon-free. Standard Siemens declarations of conformity (CE, UKCA) and RoHS/REACH statements are available on request with the RFQ.

MPN
5SY7404-8MA