| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply receptacle having the function to display warning before reaching the shut-down of power supply, or the standard of the current amount. SOLUTION: Working current al flowing in an electric wire 4 is converted into a current a2 of low level by means of a current transformer CT1, converted into the direct current by means of a diode D1, and converted into a voltage by means of a resistor R1. When an electric potential difference appearing on both ends of resistor R1 exceeds a fixed value, a light emitting diode LED1 emits a light. By this, a caution or warning that the working current has exceeded the appointed level can be displayed.
|
