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Siemens 5SY4340-7 — 3-Pole MCB (DIN Rail)

Siemens 5SY4340-7 3-Pole MCB, C-Curve, 10 kA, 400 V

MPN5SY4340-7
Active

Siemens SENTRON 5SY4340-7, 3-pole miniature circuit breaker, C-curve, 10 kA breaking capacity per EN 60898-1 at 400 V AC, 3 module width.

$41.91Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5SY4340-7 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SY4340-7 — Protection
ParameterValue
Tripping characteristic (curve)C
Breaking capacity per EN 6089810 kA
Breaking capacity per IEC 60947-215 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Energy limitation class3
Pollution degree3
5SY4340-7 — 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)3.5 W
Mechanical service life (operating cycles, typ.)10 000
Neutral conductor switchingNo
Rated voltage (AC, single-phase)440 V
5SY4340-7 — 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
5SY4340-7 — 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

The 5SY4340-7: For UL 1077 listed supplementary protection applications, the interrupting rating is 5 kA at 400 V AC.

What the C-curve and voltage ratings mean for your circuit

It will not nuisance-trip on a motor start but clears fast on a hard short. Operating voltage is 400 V AC (440 V max single- or multi-phase) and 60 V DC (72 V DC max) — the DC rating is notably lower, so if you need DC branch protection, confirm the voltage stays within the 60 V nominal ceiling. That dual-standard approval simplifies BOM approval across EU and NAFTA projects.

The 70 mm installation depth (76 mm overall) fits standard enclosures. IP20 protection with connected conductors.

Frequently asked questions

Is Siemens 5SY4340-7 UL listed?

It also carries IEC/EN 60898-1 and IEC/EN 60947-2 certification.

MPN
5SY4340-7