The utility model relates to an integration ann arranges experimental terminal box, including connector socket, work plug and testing plug, be equipped with current sampling metalwork, electric current short circuit metalwork and ground connection metalwork in the socket shell cavity of connector socket, the current sampling metalwork is connected with current transformer secondary side and overload protection device's elementary stream, and the ground connection metalwork is connected with overload protection device's ground connection cable, the last current sampling of being equipped with jack of socket shell and the return circuit jack of normally working, the work plug inserts the return circuit and normally works the jack and is connected with the current sampling metalwork, and current transformer's secondary side return circuit and current short circuit metalwork short circuit are extracted to the plug of working, testing plug one end is connected with field calibration instrument, and the other end inserts the current sampling jack. The utility model discloses utilize pulling out of work plug to insert the automation ann who has realized secondary circuit and arrange and keep apart, insert overload protection device through testing plug with field calibration instrument, stopped hidden danger and incident that the people results in for the maloperation.