本发明是关于低压电器的发明,主要是用于开关电器,如接触器中的真空开关管的发明。众所周知,真空开关管中,形成真空开关管外壳的绝缘瓷筒内配置两个电极,绝缘瓷筒的高度能使真空开关管承受很大负荷,并避免绝缘间隙击穿的危险。但是在这样的开关管中,为了保证绝 The invention relates to the invention of a low-voltage electrical appliance and is mainly used for the invention of a vacuum switch tube in a switch electrical appliance, such as a contactor. As we all know, the vacuum switch tube, the formation of a vacuum switch tube insulation porcelain cylinder configuration of two electrodes, the height of the insulating cylinder can make vacuum switch tube to withstand a heavy load, and to avoid the risk of insulation gap breakdown. However, in such a switch, in order to ensure absolute