SWITCH.

摘要

When the contactor of a switch is opened an arc is produced. It has been determined that when a large quantity of energy is injected into the arc, a high proportion of the radiated energy is optical energy. In experiments, it was as high as approx. 70%. In this switch, a light absorber formed of a highly porous inorganic material with an apparent porosity of inorganic fibrous material or porous material of at least 35% is disposed at a position at which it receives the optical energy of the arc, thereby effectively absorbing the light emmitted by the arc to reduce the temperature in the gas space and lowering the pressure in the switch.