Patent ID: 9620304
Date: 2017-04-11
CPC Classifications: H01H,H02B

Claim:
1. An interlock device of a ring main unit, the ring main unit comprising a fuse cover and a cable cover provided at a bottom of the fuse cover, the interlock device comprising: an interlock frame on a rear portion of the fuse cover and the cable cover; a rotatable cam within the interlock frame; a protruding engaging portion formed on a first part of the cam; and formed on a second part of the cam; an operating plate on the interlock frame, the operating plate moving vertically downward when the cable cover is closed and an end of the operating plate coupled to the slit to cause the cam to rotate; and a spring pulling the cam into a position where the engaging portion protrudes outside of the interlock frame, a first end of the spring fixed to a portion of the cam to store an elastic force due to movement of the cam, wherein the engaging portion prevents the fuse cover from closing when the engaging portion is moved such that it protrudes outside the interlock frame, and wherein the fuse cover is prevented from closing when the cable cover is not closed.