Surge Protective Devices,surge protector,arrester,SPD Surge Protective Devices,surge protector,arrester,SPD BY3 type SPD is suiting to A. C 50/60 Hz, ... , or it will be damaged by the over impulse current. BY3-2.5/150BY3-4.0/320BY3-6.0/420Operating voltage ... -retardant nylon PBT (Grey)Reinforced fire-retardant nylon PBT (Grey) Surge Arrester (BY3 Series)