Well, there is scientific justification for the idea of a sufficiently intense energy discharge being able to jump over any circuit breakers and blow out equipment. A strong enough lightning strike can do so. Circuit breakers aren't guaranteed protection against power surges, since they have limits. They interrupt the circuit with a gap and use the intervening air as an insulator, but a high enough voltage can jump the gap.
So while the explosions of consoles do tend to be exaggerated for effect, the basic idea of weapons fire overloading consoles isn't quite as implausible as people tend to assume. So this is a conceit that can be explained by using actual science, rather than denying it.
Hm. Well, maybe you're right. But a console burning out isn't the same as exploding like a hand grenade.
For some reason, I think was fearing that the explanation was that the EPS conduits are feeding the ravenous hunger of some fluorescent lights, a big TV, and a handful of LCD screens.