The utility model provides an outdoor breaker, sets up incoming wire terminal and terminal outgoing lines in the casing relatively, can move ground between combined floodgate position and separating brake position including insulating casing, interval and set up the operating device on the casing, operating device includes conductive parts and insulating part, when operating device is in the combined floodgate position, conductive parts respectively with advance, terminal outgoing lines contact messenger advances, terminal outgoing lines switches on, as operating device during at the separating brake position, the insulation part is located into, the wall advances between the terminal outgoing lines, terminal outgoing lines. The utility model discloses an action operating device can realize the divide -shut brake, simple structure, and convenient operation, simultaneously through bolt and sealing washer pads maintaining shell's leakproofness well, the difficult phenomenon damaging, leak electricity of appearing, insulating properties is good behind the separating brake, can ensure that the circuit is steadily at switching -off state.