ElectricThis is an electronic part manufactured by Schneider Electric, called the A9L08501 Surge Arrestor Type 2+3. It has a single plus neutral pole, is made to DIN specifications, has a temperature range of -25°C to 60°C, an IP20 rating, and requires a voltage of 230VAC to operate. It is used to protect circuits and equipment from high voltage disturbances like over-voltages, surges, or spikes.