Thermostat with reset arm - holding contact arm in open circuit position for resetting by hand

When appts. to be protected undergoes an abnormal temp. rise, the bimetallic strip moves upward until its arc is reversed, forcing up the dent (1') and therefore the contact arm (1) too. Consequently, the contact (2) is raised away from the clamp serving as the mating contact while at the same time, the inverted U-shaped free end (6') of the reset arm (6) is forced, by virtue of the arm's own elasticity, into the space now left open under the contact arm (1). Thus, even after the bimetallic element has returned to the original position, the contact arm (1) is kept from descending by the reset arm (6) and hence the contact (2) remains in the off position. When resetting the operator pulls out the free end (6') of the reset arm (6) from the space below the contact arm (1) with tweezers or the like.