This is a Siemens SENTRON 5SL7-series miniature circuit breaker — order code 5SL7340-8RC. The D-curve (10× to 20× In trip) is the key spec: it's sized for loads with high inrush, like motor starters, transformers, or discharge lighting, where a B- or C-curve would nuisance-trip on startup. The 40 A rating and 10 kA breaking capacity at 415 V three-phase mean it can interrupt a fault up to 10,000 A without welding its contacts or cascading upstream — that's the standard for most commercial and light-industrial sub-distribution boards. Three-pole construction covers a 3-phase circuit; snap-on DIN-rail mount, so it slots into any standard panel enclosure alongside other 5SL7 units.
Siemens 5SL7340-8RC MCB, 3-pole 40A D-curve 10kA 415V
MPN5SL7340-8RC
Siemens SENTRON 5SL7 series miniature circuit breaker, 3-pole, D-curve, 40 A rated current, 10 kA breaking capacity at 415 V AC.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
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Frequently asked questions
What is the 5SL7340-8RC used for?
It's a miniature circuit breaker with a D-curve, rated 40 A, 3-pole, 10 kA at 415 V. The D-curve suits loads with high inrush current — motor starters, transformers, welding equipment — where a standard B- or C-curve would trip on startup.
Where can I buy the 5SL7340-8RC and get a price?
We source this part to order against an RFQ. Availability and current pricing are confirmed at quote time through our independent distribution channels.
MPN
5SL7340-8RC