498f专题
UL 498F 2021年最新版发布 带弧形(锁定式)触点的插头、插座和耦合器标准
UL 498F:2021 Plugs, Socket-Outlets and Couplerswith Arcuate (Locking Type) Contacts Plugs,Socket-Outlets and Couplerswith Arcuate (Locking Type) Contacts 带弧形(锁定式)触点的插头、插座和耦合器UL498F:2021plugs,Socket-