Selectivité Totale vs PDC : Comprendre la Différence et Obtenir la Selectivité Parfaite

In this video, I answer a frequently asked question: "Does choosing an upstream circuit breaker with a higher PDC than the downstream one guarantee total selectivity?" Many people mistakenly believe that selectivity is guaranteed when the upstream breaking capacity is higher than the downstream one. However, in this video, I explain in detail why there is no direct relationship between PDC (Breaking Capacity) and selectivity. PDC is a purely electromechanical characteristic defined by the circuit breaker's internal components, such as the springs, contacts, and the arc chute. All of these elements are subjected to rigorous testing by the manufacturer to establish the PDC. Furthermore, the circuit breaker coil has a very specific role: it detects the fault and sends a mechanical impulse via its ferromagnetic core, but the actual breaking is performed by the mechanical part of the circuit breaker. I'll also show you how to achieve total selectivity by adjusting the ISD settings of the upstream circuit breaker and delaying its short-circuit tripping. Using these techniques, you can ensure that only the downstream circuit breaker will trip in the event of a fault, thus ensuring optimal service continuity. Watch the video to learn more and master the art of selectivity in low-voltage electrical installations! 🌐 Website: https://www.lokelect-engineering.com 💼 LinkedIn:   / lokmane-boussaa-a3385339   My online course platform https://www.lokelect-engineering.com/... My power balance calculation software https://www.lokelect-engineering.com/... My training program https://www.lokelect-engineering.com/...