[turretslug]

It also reassures that there are no RIFA smoke-bombs lurking within.... It looks to be pretty comprehensive, with a GDT included (gas discharge tube, the small round white wire-ended thingy), a tough beastie that helps quench switching and lightning spikes- as long as the lightning isn't too close or severe, there's always a point with lightning where all bets are off! Also the (Y?) ceramic capacitors look to have a thermal fuse sandwiched to them with heat-shrink, cutting them out of circuit if they overheat with really noisy mains. (The top, lone blue disc might always be a MOV rather than a ceramic capacitor, again not a bad idea to thermally fuse one of these, they can get to a point where they weld through under severe overload.)