SSOC (NCF) outdoor AC high voltage expulsion dropout fuse cutout series are installed on the distribution transformer or pole of power line for overload protection and load current switching on/off. It is composed of a main insulating & conducting structure and a fiber glass arcing tube. The stationary contacts are fixed at both ends of the insulating post and moving contacts at both ends of fuse tube, with an arcing chamber and elastic auxiliary contacts to interrupt load current and capacitor current. If for any further information, please feel free to contact us. Thank you! sales05 AT usadnk DOT com