IEC 61811-52-2002
机电式有或无继电器.第52部分:空白详细规范.经质量评定的机电式有或无电信继电器.20 mm X 10 mm底座,2组转换触点
Electromechanical all-or-nothing relay - Part 52: Blank detail specification; Electromechanical all-or-nothing telecom relays of assessed quality; Two change-over contacts, 20 mm x 10 mm base