| 摘要 |
PURPOSE:To prevent forgetting of switch OFF of a power source by providing a warning circuity to be operated when both a first auxiliary relay to be operated by a current flowing to a load side and a second auxiliary relay to be operated by the lock of an office installed with an office electric device are operated. CONSTITUTION:When a person who gets out of an office 7 at the last locks an exit door key 9 of an exit door 8, if he forgets to switch OFF the power source of an OA device 11, a lamp 13 of a device 12 for preventing forgetting switch OFF of a power source is energized to energize a buzzer 14. Then when the last person who gets out the office confirms the forgetting switch OFF of the power, he presses a reset switch 16 to stop the buzzer sound. If the last person who reconfirms the locking without forgetting power switch OFF the lamp is automatically deenergized. An operating sequence is energized by an auxiliary relay 17 when a warning contact 5 of an ammeter with an alarm contact to be output from an ammeter 3 with an alarm contact is operated. Here, if prevention of forgetting switch OFF of the power source is no more desired, it can be deenergized by a power source switch OFF forgetting release switch 15. |
