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Siemens 5SY4340-8 — 3-Pole MCB (DIN Rail)

Siemens 5SY4340-8 SENTRON 3-Pole MCB, D-Curve, 10 kA

MPN5SY4340-8
Active

Siemens SENTRON 5SY4340-8, 3-pole miniature circuit breaker, D-curve, 10 kA breaking capacity per EN 60898, 15 kA per IEC 60947-2, 400 V AC, 60 V DC.

$59.69Ref. price · indicative, final on quote
Siemens 5SY4340-8 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY4340-8 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SY4340-8 — Protection
ParameterValue
Tripping characteristic (curve)D
Breaking capacity per EN 6089810 kA
Breaking capacity per IEC 60947-215 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Pollution degree3
5SY4340-8 — Electrical
ParameterValue
Rated voltage (AC, multi-phase)440 V
Voltage type (AC/DC)AC
Supply frequency range50/60 Hz
Power loss per pole at rated current (AC, hot)3 W
Mechanical service life (operating cycles, typ.)10 000
Neutral conductor switchingNo
Rated voltage (AC, single-phase)440 V
5SY4340-8 — Mechanical
ParameterValue
Modular width units3
Mounting positionany
Width54 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Terminal tightening torque, max.75 °C
Terminal tightening torque, min.-40 °C
Combined terminal, topYes
Combined terminal, bottomYes
Fastening methodQuick assembly system
SealableYes
Accepts supplementary devicesYes
5SY4340-8 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of surrounding temperaturemax. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C
Vibration resistance (IEC 60068-2-6)±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz

Product details

D-curve trip and breaking capacity

The 5SY4340-8: The higher 15 kA rating under IEC 60947-2 covers applications where the supply transformer is close or the fault level is higher, giving the specifying engineer a single part that satisfies both residential and industrial standards. The D-curve means the magnetic trip threshold is 10–20× In, so it avoids nuisance trips on high-inrush loads but still clears a hard short quickly.

Panel fit and environmental specs

It mounts in any position and uses Siemens' quick-assembly system for ganging multiple poles.

Frequently asked questions

What is the breaking capacity of the Siemens 5SY4340-8?

For DC applications, it offers 15 kA at 60 V (72 V max) per IEC 60947-2.

Can the 5SY4340-8 be used for DC applications?

Yes, it is rated for DC operation at 60 V (72 V max) with a 15 kA breaking capacity per IEC 60947-2.

How can I order the Siemens 5SY4340-8 or check stock?

Submit a request with your quantity and target delivery window.

MPN
5SY4340-8