ElectraSim

An interactive wiring lab that behaves like the real thing. Place a breaker, run the cable, close the switch - and watch current actually flow, trip and fault. 115 components from switchgear to 3-phase, 20 guided circuits, and a 60fps off-thread solver. Free, no account, works offline as an installable PWA; data stays on your device. For students, DIYers and electricians building and testing house wiring layouts.