| 摘要 |
PURPOSE:To suppress power consumption within power supplying capacity of a power source by previously setting power source interrupting means provided in a circuit to be considered to exceed the capacity of the power source according to the using state, etc., of an electric device to an open state. CONSTITUTION:A power source auxiliary switch 5 is provided as power source interrupting means between a heat generator 2 and a power source 4. If it is presumed that power consumption exceeds power supplying capacity of the power source when the power source is applied to both heat generators 1, 2 according to using state, etc., of other electric device connected to the same power source, the switch 5 is previously opened. Even if both the generators l, 2, i.e., a circuit for consuming large power is selected by a changeover switch 3, the power consumption is assumed to be only by the generator l. Thus, when the power source is unintentionally made to work, melting of a fuse of the power source, operation of a safety unit can be eliminated. |
