The present invention relates to a thermal overload relay for phase protection, and an object of the present invention is to prevent the vertical flow of the shifter when the thermal overload relay is vibrated and to keep the shifters coupled to each other when moving horizontally according to the displacement of the main bimetal. By moving, it is to provide a shifter and a lever structure of an open phase thermal overload relay for an image protection that can transfer the bending displacement of the main bimetal to the switching mechanism part most stably.;In order to achieve the above object, the thermal protection overload relay according to the present invention is provided with a main bimetal, a shifter, and a lever in a case, and a temperature compensation bimetal, a release lever, a reversal mechanism, and a normally closed contact in an auxiliary case above the case. And a thermal overload relay having a normally open contact; The shifter includes an upper shifter and a lower shifter, a rib having a predetermined height to contact the shifter guide groove of the case at a long side and one end of the upper shifter to prevent a vertical flow when the shifter is moved, and an upper part of the lever. The shifter and the lower shifter form a combined shape, characterized in that the lower locking projection protruding by a predetermined length so as to be movable.
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