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Siemens 5SY7402-8MA — 4-Pole MCB (DIN Rail)

Siemens 5SY7402-8MA SENTRON MCB, 4P D 2A, 50 kA IEC

MPN5SY7402-8MA

Siemens SENTRON 5SY7402-8MA miniature circuit breaker, 4-pole, D tripping characteristic, 2 A rated current, 400 V AC, 50 kA breaking capacity per IEC 60947-2, 4 width units.

Siemens 5SY7402-8MA datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY7402-8MA — Identification
ParameterValue
Type / order code5SY7MA
Brand nameSENTRON
Application suitabilityIndustry
5SY7402-8MA — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC400 V
Rated current (In), AC2 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
5SY7402-8MA — Protection
ParameterValue
Tripping characteristic (trip curve)D
Rated breaking capacity, per IEC 60947-250 kA
Overvoltage categoryIII
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SY7402-8MA — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
SealableYes
5SY7402-8MA — 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
5SY7402-8MA — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

What this 4-pole D-curve MCB is for

Terminals accept solid or stranded conductors from 0.75 to 35 mm²; tightening torque is 2.5 to 3.5 N·m. Combined terminals top and bottom simplify daisy-chaining busbars.

Overvoltage category III means it is rated for fixed-installation distribution boards, not just downstream equipment. The D-curve trips magnetically at 10 to 20 times rated current (20 to 40 A), so it holds through motor inrush without nuisance tripping. Only magnetic tripping — no thermal element — so it relies on upstream or downstream overcurrent protection for sustained overloads.

Sealable design allows locking the breaker in the off position for lockout/tagout. Touch protection is standard. Humidity tolerance: max 95% RH up to 55 °C, derating to 55% at 70 °C and 35% at 75 °C.

Frequently asked questions

What is the breaking capacity of 5SY7402-8MA?

50 kA at 400 V AC per IEC 60947-2, which is the standard for industrial distribution panels.

What conductor sizes does 5SY7402-8MA accept?

Solid or stranded conductors from 0.75 to 35 mm², with a tightening torque of 2.5 to 3.5 N·m.

Where can I buy 5SY7402-8MA?

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

MPN
5SY7402-8MA