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Siemens 5SN6340-7CN — Miniature Circuit Breakers (MCB)

Siemens 5SN6340-7CN SENTRON MCB, 3P C 40A 6kA 400V

MPN5SN6340-7CN

Siemens SENTRON 5SN6340-7CN, miniature circuit breaker, 3-pole, C-curve, 40 A, 6 kA breaking capacity per EN 60898 at 400 V AC, 50/60 Hz.

Siemens 5SN6340-7CN 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

5SN6340-7CN — Ratings
ParameterValue
Overvoltage categoryIII
5SN6340-7CN — Mechanical
ParameterValue
Width54 mm
Height90 mm
Depth76 mm

Product details

Siemens SENTRON 5SN6340-7CN — 40 A, C-Curve, 3-Pole MCB

The 3-pole design (3P) switches all phases simultaneously, with no switched neutral (neutral conductor switching: No). Frequency range covers 50/60 Hz, so it is equally at home on 50 Hz European or 60 Hz North American supply systems (within the voltage rating).

At 54 mm wide (3 modular width units), this breaker occupies three standard 18 mm DIN-rail slots. Terminals accept solid conductors up to 25 mm², which is generous for a 40 A device — you can land the full-rated feeder without pigtailing or doubling up. Pollution degree 2 (non-conductive pollution only) is the standard for normal factory-floor environments.

The overvoltage category is III (fixed installation), and the energy limitation class is 3, meaning it limits let-through energy to a level that protects downstream equipment during a fault. The sealable design (tamper-evident seal available) is useful for utility or metering applications where unauthorized switching must be prevented.

Frequently asked questions

Where can I buy 5SN6340-7CN and get a price?

The 5SN6340-7CN is sourced and quoted to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time.

What is the closest functional second-source to 5SN6340-7CN — 5SL4363-7?

The 5SL4363-7 is a close sibling in the SENTRON family: same 3-pole C-curve form factor, same 76 mm depth and 54 mm width, but rated 63 A with a 10 kA breaking capacity (vs. 40 A / 6 kA on the 5SN6340-7CN). The 5SL series carries a higher interrupting rating and a higher power loss per pole (5 W vs. 3.3 W). Panel cutout and DIN-rail footprint are identical — the 5SL4363-7 will drop into the same enclosure without rewiring, provided the feeder and load are sized for 63 A.

Will 5SN6340-7CN drop into a panel specified around 5SL4363-7 without rewiring?

Yes. Both breakers share the same 76 mm depth, 54 mm width (3 MW), 90 mm height, DIN-rail mounting, and terminal cross-section acceptance up to 25 mm². The 5SN6340-7CN is a drop-in replacement for the 5SL4363-7 in terms of mechanical fit — no enclosure modification or re-termination needed. The difference is electrical: 40 A vs. 63 A rating and 6 kA vs. 10 kA breaking capacity, so verify the load and fault level before swapping.

What compliance documentation does Siemens provide for 5SN6340-7CN?

The breaker is rated per EN 60898 (6 kA at 400 V AC) and carries overvoltage category III and pollution degree 2 ratings. The housing is halogen-free and silicon-free. For specific RoHS, REACH, or UL documentation, request the manufacturer's declaration of compliance with your RFQ — these are typically provided as part of the product documentation package.

MPN
5SN6340-7CN