Skip to main content
Log in
Siemens 5SY6340-8CC — 3-Pole MCB (DIN Rail)

Siemens 5SY6340-8CC SENTRON MCB, 3P D 40 A, 6 kA

MPN5SY6340-8CC

Siemens SENTRON 5SY6340-8CC, miniature circuit breaker, 3-pole, D tripping characteristic, 40 A rated current, 6 kA breaking capacity per EN 60898, 400 V AC, 3 modular width units.

Siemens 5SY6340-8CC datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY6340-8CC — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SY6340-8CC — Protection
ParameterValue
Tripping characteristic (curve)D
Breaking capacity per EN 608986 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Pollution degree3
5SY6340-8CC — 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
5SY6340-8CC — 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
5SY6340-8CC — 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 Siemens SENTRON 5SY6340-8CC is a 3-pole miniature circuit breaker (MCB) with a D tripping characteristic, rated at 40 A and 400 V AC. Its 6 kA breaking capacity per EN 60898 covers standard industrial branch-circuit fault levels, while the D-curve (10–20× In) is sized for loads with high inrush — motor starters, small transformers, or welding equipment — where a B or C curve would nuisance-trip on startup.

Occupies 3 modular width units (54 mm wide) on a DIN rail; the 76 mm depth and 70 mm installation depth fit standard distribution boards. Snap-on quick assembly system, any mounting position. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.

Frequently asked questions

What is the breaking capacity of 5SY6340-8CC?

6 kA per EN 60898 at 400 V AC, and 5 kA per UL 1077 and CSA C22.2 No.235 — so it covers both IEC and North American panelboard fault ratings.

Where can I buy 5SY6340-8CC?

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

What is the D-curve on this MCB for?

The D tripping characteristic (10–20× In) is designed for loads with high inrush current — motor starters, small transformers, discharge lamps — where a B or C curve would trip on startup.

Will 5SY6340-8CC fit in a panel designed for 5SY4140-7?

Both are 3-pole SENTRON MCBs on the same DIN-rail footprint and modular width, so the 5SY6340-8CC will physically fit. The key difference is the tripping curve (D vs. B/C) and the current rating — verify the branch circuit's inrush and load current before swapping.

MPN
5SY6340-8CC