Yaskawa: VFD Panels and Short Circuit Current
If you ignore the short circuit current rating (SCCR) of an industrial panel it might just go away anyway. By go away I mean that the panel might just self-destruct. If the available current or energy that reaches the panel in the event of a short circuit in the panel exceeds the levels that the panel can safely interrupt or contain, that energy has to go somewhere. It is the unpredictability of what will happen first that makes an insufficient SCCR so dangerous. Maybe the circuit breaker will explode while trying to open or maybe not open at all because the internals have welded shut? What happens then? Maybe the energy will find a path to ground and a shock hazard is created.
