IEC 61811-53-2002
机电式有或无继电器.第53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.14 mm X 9 mm底座,2组转换触点
Electromechanical all-or-nothing relays - Part 53: Blank detail specification; Electromechanical all-or-nothing telecom relays of assessed quality; Two change-over contacts, 14 mm x 9 mm base