DVDdoug
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Most of them don't have filters (but some do). A filter will filter-out high-frequency noise but it won't generally filter-out clicks & pops (when a motor switches-on, etc.). It might help with a buzz from a light dimmer.Not sure I believe in filtering the ground unless this can somehow protect the gear and prevent ground loops
And, they don't fix ground loops.
A surge protector is normally a "transorb", which "switches-on" and essentially becomes a short-circuit to kill voltage spikes. These things would normally burn-up from excess current (when the voltage is above the threshold) so there is usually also a fuse that hopefully blows before the device burns-up. Or if the voltage-spike is very-short in duration, both the device and the fuse can survive. A circuit breaker is probably not fast-enough.
Probably not but "power conditioner" is a vague term.I’ve heard that ‘power conditioners’ can actually reduce the available current to amps