The 3-phase in-line High Performance Feed-Through range of surge suppression filters are designed to be 'hard wired' in single and three phase, fixed equipment applications or in applications when multiple pieces of equipment are used in one area. They offer a cost effective solution yet provide effective filtration and transient protection. 20mm conduit holes have been provided and termination is by means of 6mm studs. The three phase unils must be installed with primary surge protectors, type SS40. Surge handling characteristics are as specified In SS40 specifications. See Clearline product # 12-10237.