It is especially used for illumination and distribution in industry and commerce, etc. It has pleasing outlook & high breaking capacity, reliable performance, high inflamable resistance and shock resistance for long service life. It is within the circuit of AC 50/60Hz, rated voltage of single pole up to 240v , two, three or four poles up to 415v. It can also be used for an unfrequent change over of the circuit and illumination under normal condition.