The Z trip curve is designed for protection of semiconductor loads and sensitive electronic equipment where even short-duration overcurrents can cause damage — it trips faster than a B or C curve on low-level faults. This is the breaker you spec when the downstream load is a rectifier, a DC power supply, or a control transformer that cannot tolerate a sustained 3–5× inrush.
Siemens 5SL4340-0RC MCB, 40A 3-Pole Z-Char 10kA
MPN5SL4340-0RC
Siemens 5SL4 series miniature circuit breaker, order code 5SL4340-0RC, 40A, 3-pole, Z characteristic, 10kA breaking capacity.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Product details
Frequently asked questions
What is the breaking capacity and trip characteristic of the 5SL4340-0RC?
It is a 40 A, 3-pole miniature circuit breaker with a Z characteristic and 10 kA breaking capacity. The Z curve provides fast tripping on overcurrents, making it suitable for semiconductor protection.
Where can I buy the 5SL4340-0RC?
This part is sourced to order against an RFQ through independent distribution. Submit a request for current pricing and availability.
MPN
5SL4340-0RC