| 摘要 |
PURPOSE:To avoid interruption by a breaker due to overcurrent, to allow a small current contract, and to prevent an accident of an appliance not turned OFF inadvertently. CONSTITUTION:An adapter 2 is connected between an appliance 6c which can be interrupted with an overcurrent and a receptacle. When a detected current exceeds a contract current limit, a breaker 1 interrupts the adapter current and if the contract current limit is exceeded even after interruption of all adapters, the breaker is interrupted. An allowable conduction time is set for the breaker or the adapter and it is interrupted when the working time of adapter exceeds the allowable time. Consequently, the appliances are interrupted only partially even if the contract current limit is exceeded and when the current exceeds the contract limit continuously, the breaker functions to interrupt power in safety. When the current flows longer than the allowable time, a decision is made that an appliance is not turned OFF inadvertently and power is interrupted automatically. |
