IEC 60050-445:2010定义了与指定时间继电器相关的术语。本第二版取消并取代2002年出版的第一版，构成技术版。根据IEC指南108，它具有水平标准的地位。这一新版本已经过修订，以便: -纳入行业更常用的术语； -纳入时序图以帮助解释涉及一系列操作的定义。

IEC 60050-445:2010 defines terms related to specified-time relays. This second edition cancels and replaces the first edition published in 2002 and constitutes a technical edition. It has the status of a horizontal standard in accordance with IEC Guide 108. This new edition has been revised in order to:
- incorporate terms more commonly used by industry;
- incorporate timing charts to help explain definitions involving a sequence of operations.