Pressure relieving system for electrical switch cabinet

The invention discloses a pressure relieving system for an electrical switch cabinet. The pressure relieving system for the electrical switch cabinet is characterized by comprising a pressure relieving cover arranged on the top of the switch cabinet; four corners of the pressure relieving cover are connected with the top edge of the switch cabinet through a bolt; a compression spring sleeves the lower end of the bolt, such that the bolt is finally fixed with a nut; therefore, a certain distance exists between the nut and the top of the switch cabinet; pressure relieving holes are also arranged around the pressure relieving cover; an air bag is arranged between the bottom surface of the edge of the pressure relieving cover and the top surface of the top edge of the switch cabinet; an air inlet and an air outlet are arranged at the bottom of the air bag, wherein the air inlet is larger than the air outlet; and a blocking flange is arranged at the inner side of the air inlet. The pressure relieving system for th