The invention discloses an
interlocking device of a change-over switch. The
interlocking device of the change-over switch comprises an upper part and a lower part, which are in a symmetrical structure. The
interlocking device is mounted at the position of a middle interval of an operation mechanism of the change-over switch; each one of the upper part and the lower part comprises an interlocking rod, a limiting pin located at the end part of the interlocking rod, a resetting spring with one end fixed with the interlocking rod, and an
idler wheel located between the limiting pin and the resetting spring; and the end part of each interlocking rod extends out to form an arch upper protruding part. A spindle at one of the upper part and the lower part of the operation mechanism drives a
cantilever to rotate; each interlocking rod is pushed to rotate around a rotating point in a rotating process; and the protruding part on each interlocking rod presses a
tripping rod at the other part of the operation mechanism, so that the
tripping rod is prevented from moving. Therefore, conversion between a power source at a
normal side and a power source at a spare side is realized. The interlocking device of the change-over switch provided by the invention has the advantages of simple structure,
high security and high reliability, no occupied space, small size, easiness of realization and low cost, and is mounted and works by fully using an own interval.