| 摘要 |
A device for preventing power devices from operating unattended. The device includes a terminal for connection to power, a power device having an ON/OFF switch for turning the power device either ON or OFF, and a safety circuit located between the terminal and the ON/OFF switch. The safety circuit detects the state of the ON/OFF switch to determine whether or not to allow power to be provided from the terminal to the ON/OFF switch. If the ON/OFF switch is in the OFF position when power is applied to the terminal, the safety circuit allows power to be provided to the ON/OFF switch. If the ON/OFF switch is switched to the ON position when power is applied to the terminal, the safety circuit prevents power from being provided to the ON/OFF switch until the ON/OFF switch is first turned OFF.
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