Designed with reliable Installation and flat electrodes of good heat exchange. PA varistor can be Installed in situations with strong vibration or industrial electronic products with high power consumption. Flat electrodes are soldered with metalled disc, and potted in bakelite housing with non-flammable and Insulating material. It is widely used in industrial automatic control equipment, power supply control, water supply system, petrolatum equipments, mining equipments, railway signal system, etc..