Abstract: A LV electrical penetration assembly with perfusion sealing conductor feedthrough module was developed,which can be used for the connection of internal and external cables through the wall of the research reactor workshop.The LV electrical penetration assembly was combined with several independent modules.The maintenance and replacement of the assembly can be easily done in service.The sealing of conductor feedthrough module was achieved with the perfusion of self-extinguishing epoxy.The leakage be-tween the conductor feedthrough module and the end plate module was blocked with rubber rings.The result of the leakage test and the electrical performance test for the samples of conductor feedthrough module satis-fied the requirement of research reactor.The structure of the new electrical penetration assembly is simple and compact.It can be manufactured with mature technology and cost low price.The performance of the assembly is steady.It can be used widely in research reactors.