The utility model discloses an ac motor electrothermal relay testing arrangement, including box, control panel, chamber door, a reset spring, telescopic link, protruding type slider, U type backup pad, heating element, fan, heat preservation, backup pad, the 2nd reset spring, reset button, first permanent magnet, second permanent magnet, piston rod, slide rail and refrigeration piece, there is thecontrol panel one side of box through bolted connection, there is the chamber door box one side through hinged joint, all there is the heat preservation outside of box through bolted connection, thebottom inner wall of box has the fan through bolted connection, there is heating element at the top of fan through bolted connection, the pillar is installed in the both sides correspondence of fan, there is U type backup pad at the top of pillar through bolted connection, the through -hole has evenly been seted up to the inside of U type backup pad, the electrothermal relay testing arrangement, and the fixed electrothermal relay of being convenient for has heat preservation and cryogenic function simultaneously.