... for the module. Product DescriptionNS1-(D, C, B) 5 series surge protection device (in short: SPD, alias: surge suppressor, surge arrester) ... mounted on the module of surge protection device. \When the SPD fails in breakdown for over-heat and overcurrent, the failure ... equipment, operating room, custody, electronic equipment etc. and in the socket box in control equipment. It is also applied for below ...