The Siemens 5SJ6140-6RC is a 1-pole miniature circuit breaker (MCB) from the Retail line, rated at 40 A with a 6 kA breaking capacity and a B tripping characteristic. The B curve means it trips at 3 to 5 times rated current, making it the standard choice for resistive and general-purpose loads in residential and light commercial distribution boards — lighting circuits, socket outlets, and small appliances where inrush is low. 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.
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jul 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