Vacuum circuit breaker

The utility model discloses a vacuum circuit breaker, which comprises a vacuum circuit breaker body, wiring grooves are arranged at the upper part and the lower part of the circuit breaker, fixing pieces are arranged on the outer walls of the wiring grooves, clamping devices are detachably arranged on the fixing pieces, and each clamping device comprises an upper fastener and a lower fastener. The upper fastener and the lower fastener are both provided with arc-shaped grooves used for being communicated with the wiring groove, the arc-shaped grooves are internally provided with pressing pieces abutting against the electric wire, and after the upper fastener and the lower fastener are fastened, the pressing pieces clamp and fix the electric wire or the connecting position of the electric wire and the wire clamp, so that the connection stability of the fixed electric wire is improved, and the pulling capacity is improved. The wire is prevented from falling off, and the use safety is greatly improved. 本实用新型公开了一种