The 6 kA breaking capacity at 230/400 V is adequate for most final subcircuits in a TN or TT system; for higher prospective fault currents (e.g., close to a transformer), you step up to a 10 kA or 15 kA rated MCB.
Siemens 5SJ6140-6RC MCB 1P 6kA 40A B Curve
MPN5SJ6140-6RC
Siemens 5SJ6 Retail line MCB, 1-pole, 6kA breaking capacity, 40A rated current, B characteristic, order code 5SJ6140-6RC.
Source DocumentedChannel stated on listing & quote
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Product details
Frequently asked questions
What is the breaking capacity and characteristic of 5SJ6140-6RC?
It is a 1-pole MCB with a 6 kA breaking capacity, 40 A rated current, and a B characteristic (trips at 3–5× In).
Where can I buy 5SJ6140-6RC?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
MPN
5SJ6140-6RC