The utility model discloses a pluggable pre-short-circuited current protection rectangular connector, which comprises a socket and a plug, a plurality of pairs of socket pins are arranged in the socket in pairs, and plug pins in one-to-one correspondence with the socket pins are arranged in the plug; a short circuit part is also arranged in the socket and is used for short-circuiting each pair ofsocket pins; a pushing part which is arranged corresponding to the short circuit part and is used for disconnecting the short circuit part from the socket pin is arranged in the plug, and when the socket is separated from the plug, the short circuit part is used for short-circuiting the socket pin; and when the plug is inserted into the socket, each pushing part pushes the short circuit part, so that the short circuit part is disconnected from the adjacent socket pin. In order to prevent the open circuit of the secondary side of the current, the first closing of the current short-circuit reed,the second opening of the socket pin, the automatic short circuit of the secondary side of the current transformer, the isolation of the relay protection device and the secondary side of the currenttransformer, and the loop entering the maintenance state, the hidden danger of the open circuit of the current transformer caused by the mis-pulling of the electrified loop by workers is avoided.