What is the english name for one of the secrect devices talked about in The Black Sun?
The Black Sun (Twining novel) The Black Sun is a 2005 historical novel by British author James Twining dealing with Nazism and occultism, Die Glocke and stolen Jewish art.
Surge arrester A surge arrester is a device to protect electrical equipment from over-voltage transients caused by external (lightning) or internal (switching) events. Also called a surge protection device (SPD) or transient voltage surge suppressor (TVSS), this class of device is used to protect equipment in power transmission and distribution systems. (For consumer equipment protection, different products called surge protectors are used.) The energy criterion for various insulation material can be compared by impulse ratio, the surge arrester should have a low impulse ratio, so that a surge incident on the surge arrester may be bypassed to the ground instead of passing through the apparatus.