| 摘要 |
An anti-lightning stroke overcurrent protection switch comprises an overcurrent protection switch with an overvoltage protection sensor disposed inside and operated by one of the conductive plates. The overvoltage protection sensor comprises a metal oxide varistor and an insulating thermosensitive piece, disposed at one side of the operating portion of the conductive plate; on the other side a spring is arranged, providing the elastic force to hold the position of the thermosensitive piece. When the metal oxide varistor rises up the temperature to a certain degree due to high voltages, the thermosensitive piece would melt instantly due to its large contact surface and rapid heat conduction, resulting the elastic force counterbalanced and assuring the switch to be turned off before reaching an exceeding high degree of temperature, further improving safety of the present invention. |
| 主权项 |
1. An anti-lightning stroke overcurrent protection switch comprising:
a housing with a press button, a first conductive plate, a second conductive plate, and a third conductive plate; said first conductive plate having a binary alloy conductive spring leaf and a first connecting point and said second conductive plate having a second connecting point at top corresponding to said first connecting point; a moving rod linking up the bottom of said press button with one end and a movable end of said binary alloy conductive spring leaf with the other end, whereby the press button pressing said binary alloy conductive spring leaf and connecting the first connecting point and the second connecting point, turning on the switch, and when current overload happens the binary alloy conductive spring leaf would deform due to high temperature, moving said first connecting point and the second connecting point apart, thus turning off the switch, so as to form an overcurrent protection switch; wherein said second conductive plate includes an extending portion stretching out the housing and an operating portion inside thereof; said operating portion further has an upper section fixed by said second connecting point and a lower section which includes a first side and a second side and is electrically connected to said upper section; said second side is partially contacting the extending portion via electrical connection but is separable; an overvoltage protection sensor comprising a metal oxide varistor and a thermosensitive piece; said metal oxide varistor being unwrapped and having a first surface on one side and a second surface on the other; said thermosensitive piece being made of heat-sensitive materials, which would melt instantly when reaching a pre-determined temperature degree during operation, and the bottom of the thermosensitive piece fitting the second surface of said metal oxide varistor, further making the first surface thereof fitting a contact surface of said third conductive plate, forming an electrical contact; the front of said thermosensitive piece facing and partially contacting the first side of said lower section; a spring having a first end at one side and a second end at the other, and being arranged on the second side of said lower section; the second end thereof abutting a holding surface arranged in the housing, providing the elastic force for the spring to hold said thermosensitive piece; whereby said thermosensitive piece would melt when an overvoltage occurs and the temperature of said metal oxide varistor rises up to the pre-determined degree while the switch is operating by the connection between the first connecting point and the second connecting point, counterbalancing the elastic force and further displacing the operating portion, therefore separating the first conductive plate and the second conductive plate, turning off the switch. |
