在与双金属加热条操作的定时电源控制装置的形式的电开关装置（1）（15）开关（6）以卡扣开关的形式，具有用于改变配合触头（36）和对置停止之间的距离的调节装置（39） （37）（34）对于被这样与开关装置的不同设定范围的设定同时致动时，可动开关触点，该装置开关（6）的开关滞后是小的，并选择为大于在低调整范围内的更高的设定范围。 其特征在于在特定的设备开关（6）的工作周期的较小的值，可以更精确地设定，使得非常精确的功率控制导致较低的调整范围。

An electric switching device (1) in the form of a timing power control device with a a heated bimetallic strip (15) operated device switch (6) in the form of a snap switch, has an adjusting device (39) for changing the distance between the mating contact (36) and the counter-stop (37) for the movable switching contact (34) which is actuated simultaneously with the setting of different setting ranges of the switching device, that the switching hysteresis of the device switch (6) is smaller and selected to be greater at higher operating ranges is in low operating ranges. This particularly smaller values ​​of the duty cycle of the device switch (6) can be adjusted much more accurately, so as to give a very accurate power control in the lower operating ranges.