Patent ID: 9312678
Filing Date: 2016-04-12
CPC Classification: H02H

Claim Text:
1. A surge protection device comprising: a pulse controlled switch being a pulse relay, adapted to connect in series to a power line loop and having: a pulse generation circuit having: an abnormal voltage detection circuit having: wherein when the control button is pressed, a pulse is transmitted to the base of the second transistor, when the second transistor is turned on, the first transistor is turned on and a current passing through the first transistor sends another pulse to the forward control terminal of the excitation coil to close the two switch contacts of the pulse controlled switch and connect the switch contacts to the power line loop; and when the abnormal voltage detection circuit detects an abnormal voltage occurring on the power line loop, a pulse generated by the abnormal voltage detection circuit is sent to the reverse control terminal of the excitation coil to control the two switch contacts of the pulse controlled switch to be open and disconnected from the power line loop.