Why AC rated MCB’s shouldn’t be used for DC? ARC fun!!!

This week in week 35 of becoming an electrician I played with some MCB's to see how they operate. We prove that an AC breaker isn't designed for 220v DC...
Each week I'm sharing my electrical journey, getting used to the camera, presenting and building contacts. Why? To share the energy transition journey! The modern day equivalent of the industrial revolution.... Ooo whatever could I have planned...