Skip to main content
AO Ctrl
Log in
Siemens 5SY6340-8CC — Miniature Circuit Breakers (MCB)

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)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

5SY6340-8CC — Ratings
ParameterValue
Overvoltage categoryIII
5SY6340-8CC — Mechanical
ParameterValue
Width54 mm
Height90 mm
Depth76 mm

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