Do these devices reset automatically after being triggered? If so how long is the interruption they make?

What I am thinking is that if they do reset, and it is a relatively short break, then some sort of UPS device might be possible. This could keep the flow going if the supply were temporarily cut due to the short, sharp sounds discussed above, but would quickly run down in the event of sustained excess volume. No damage to sound gear due to unexpected switching on/off, and uninterrupted sound if levels set OK.

Of course such a device might be prohibitively heavy or expensive, I imagine that the average sound rig draws a fair bit more electricity than a PC plus accessories. Whatcha fink??