JUT1-6S(Test-type terminal block): The movable medal component used as switch could stand maximum work current through terminal wire-pressing frame. When in switch-over, operator should use screwdriver to whirl screw loosely and move slipping-lump, then the switch would be seen clearly. There is test socket at two sides of terminal in addition to corresponding test plugs used to form test connection, the system operation doesn't need to be suspended at the time of measuring current.