Electrical circuit quick connection and disconnection system with automatic short circuit of current transformer secondaries and similar devices, consists of a multipole plug (6) and receptacle (11) system with automatic short-circuit capacity between the poles (7, 12) upon initiation of disconnection between the plug (6) and the receptacle (11), without incurring in the temporary opening of the circuit, for application in current transformer (3) secondary circuits (3B) and other applications requiring the same characteristics. The system is equipped with a number N of paired poles (7, 12), being that each pair of poles (7, 12) is connected to a CT (3) secondary (3B), therefore handling the connection of N CT (3) secondaries (3B). Each pair of poles (J, 12) is equipped with a system that, under normal conditions of use, that is, with the plug (6) and the receptacle (11) connected, allows the normal passage of current from the CT (3) secondary (3B) to the load (14) connected to the latter, without short-circuiting the CT (3) secondary (3B).