Abstract: A thermal protector includes a bimetal plate which is prevented from being vibrated by a magnetic field produced by a transformer or a motor. A member made of magnetic material is disposed in the vicinity of the bimetal plate. The fixed member for loosely holding the bimetal plate may be made of magnetic material. The fixed metal fitting for connecting a first fixed plate with a movable plate is extended near to the bimetal plate and is made of magnetic material.

Abstract: A thermal protector having a fixed plate with a fixed contact point at one end, a movable plate having a movable contact point at a position corresponding to the fixed contact point. A bimetal plate which bends when a temperature exceeds a specified level deforms movable plate so as separate the contacts. There are first and second terminals connecting the fixed and movable plates with an external circuit and a heating element connected to the first and second terminals to maintain an open-circuited state. The heating element is flexible and is arranged so as to be deformed following the deformation of the bimetal plate and to always physically contact always with the bimetal plate.