PURPOSE: To control an electric power switch manually and automatically, eliminate human errors, and guarantee the operation of electric power source units for various kinds of apparatuses by controlling the electric power switch by outside signals.
CONSTITUTION: A valve (c) for holding, a valve (d) for opening, a contactor (a), an electromagnetic coil (n) for opening, and an electromagnetic coil (0) for holding are provided for a conventional electric power source switch. The valve (c) for holding is operated by operating the electromagnetic coil for holding by outside signals and the electric power source switch is kept in the electricity running state and thus an electric power source operation is guaranteed. Also, the valve (d) for opening is operated by operating the electromagnetic coil (n) for opening by outside signals and the electric power source switch is kept in open state automatically and thus the electric power source unit is stopped. Since the contactor (a) is provided, a signal to stop the electric power source unit can be sent from the electric power source switch to outside even if the electric power source switch is in holding state and thus stopping the electric power source unit is also guaranteed.
SHINPO NAOKI
TAGAWA KAZUHIKO
NEC NIIGATA LTD