Lightning Arrester is a negative psych found on three pins. It is activated by touching an empty space, but like other pins that use this activation, it may also be activated by directly touching an enemy. Neku will fire a lightning bolt in the direction of where the stylus was touched. The main feature of this psych is that the bolt may be aimed directly above or below Neku. Lightning Arrester pins are categorized under B class.
In telegraphy and telephony, a delta lightning arrestor is placed where wires enter a structure, preventing damage to electronic instruments within and ensuring the safety of individuals near them. Smaller versions of lightning arresters, also called surge protectors, are devices that are connected between each electrical conductor in power and communications systems and the Earth. These prevent the flow of the normal power or signal currents to ground, but provide a path over which high-voltage lightning current flows, bypassing the connected equipment. Their purpose is to limit the rise in voltage when a communications or power line is struck by lightning or is near to a lightning strike.
A lightning arrester may be a spark gap or may have a block of a semi-conducting material such as silicon carbide or zinc oxide. Some spark gaps are open to the air, but most modern varieties are filled with a precision gas mixture, and have a small amount of radioactive material to encourage the gas to ionize when the voltage across the gap reaches a specified level. Other designs of lightning arresters use a glow-discharge tube (essentially like a neon glow lamp) connected between the protected conductor and ground, or voltage-activated solid-state switches called varistors or MOVs.