| 摘要 |
PURPOSE: An auto earth line detection apparatus is provided to conveniently install electric heating device and automatically switches the power source end of the commercial AC power source. CONSTITUTION: The first switch(30) and the second switch(40) are connected one side powered terminal and the other side powered terminal of the commercial AC source and is switched with the switching control of MICOM. The third switch(50) is connected to the earth end of the commercial AC source and is switched with the switching control of MICOM. The MICOM(10) controls the switching of the commercial AC source supply about the corresponding electric heater. |
