Block mouse board by board surface and enough into the slot, the appearance of the visible part of the aluminum customized rivets extend on both sides of the door frame slot available is fixed to the door frame in parallel when needed to block mouse board along the inner diameter of insert card slot Among slot when not remove the block mouse board, does not affect the normal door switch. Block mouse board can inhibit the mice in the substation, power telecommunications room, crawling on distribution transformers, reducing the transformer insulator phase short circuit between terminals to prevent burn equipment, substations tripped blackout, reducing the safe operation of the power system threats. http://www.botongdianli.net/