Switch for sensing pressure in switchgear

A switch for sensing a pressure in switchgear is provided to reduce a ripple effect of an accident taking place in the switchgear by connecting the switch for sensing a pressure to an opening structure of a cover mechanically. A switch for sensing a pressure in a switchgear operates a trip device by moving forward while rotating together with an opening motion of a cover part when a pressure is generated in the switchgear including a case(1) and a blocking device, a bus bar, and a divergence main cable inside the case. A trip rod(30) is disposed at a rear side of an upper surface of a ceiling of the case. An interlocking pin(31) and a hanging pin(32) are arranged on the trip rod. A hanging part(40) is disposed in the case and a spring(S) is circumscribed on a front end of the trip rod. An expanding unit is disposed at the front end of the trip rod. A second bracket is disposed in the case to support the trip rod. A trip device(60) is disposed adjacent to the front of the trip rod.