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????联系人：郑阿清                              ????                       
????手 机：18106937709（微信同号）????
????QQ: 3007272972                          ????

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 and the armature will overcome the pull of the return spring to the core under the action of electromagnetic attraction, thus, the moving contact of the armature is driven to engage with the static contact (normally open contact) . When the coil is turned off, the magnetic attraction disappears, and the armature returns to its original position in the reaction of the spring, causing the moving contact to engage with the original static contact (normally closed contact) . In this way, suction, release, so as to achieve in the circuit of conduction, cut-off purposes. The relay's normally open and normally closed contacts can be distinguished as follows: when the relay coil is not energized, the static contact in the open state is called normally open contact;. 2. The working principle and characteristic of the thermal spring relay is a new type of thermal switch which uses the thermal magnetic material to detect and control the temperature. The utility model is composed of a temperature-sensing magnetic ring, a constant magnetic ring, a reed pipe, a heat conducting mounting plate, a plastic substrate and some other accessories. 

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夏叔叔走了，秋阿姨忙着给树木换上了漂亮华丽的金装。登高望去，树林犹如一片茫茫的金海。秋风掠过，树叶纷纷掉下，有的像蝴蝶翩翩起舞，有的像黄莺展翅飞翔。地上满是树叶，像铺了一层厚厚的金毯。 

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