IEC 60335-2-51:2023 CMV包含官方标准及其注释版本。注释版本为您提供了一种快速简单的方法来比较IEC 60335-2-51:2023版5.0和之前的IEC 60335-2-51:2019版4.0之间的所有更改。此外，还提供了IEC TC 61专家的意见，以解释最相关变更的原因，或澄清内容的任何部分。 IEC 60335-2-51:2023涉及用于供暖系统或供水系统的家用和类似用途电动固定式循环泵的安全性，其额定电压对于单相电器不超过250 V，对于其他电器（包括直流(DC)供电的电器）为480 V。泵的液压和电气部分可以在同一个外壳中，以便水流过马达并用作冷却剂，或者它们可以被分离。不打算用于正常家庭使用，但可能对公众造成危险的电器，如打算供商店、轻工业和农场中的外行人使用的电器，都在本标准的范围内。在可行的情况下，本标准涉及家庭内外所有人都会遇到的设备带来的常见危险。然而，一般来说，它没有考虑到: -身体、感官或精神能力受损的人（包括儿童）；或缺乏经验和知识使他们无法在没有监督或指导的情况下安全使用器具； -儿童在玩电器。 提请注意以下事实: -对于拟用于车辆或船上或飞机上的器具，可能需要附加要求；-在许多国家，国家卫生当局、负责保护劳工的国家当局和类似当局规定了额外的要求。 本标准不适用于 -用于循环水以外的液体的泵； -泵，循环泵除外(IEC 60335-2-41)； -专用于工业用途的循环泵； -用于存在特殊条件的场所的循环泵，例如存在腐蚀性或爆炸性环境（灰尘、蒸汽或气体）。 这第五版取消并取代了2019年出版的第四版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: a)文本已符合IEC 60335-1:2020; b)一些注释已转换为规范性文本（第1条）； c）引入了使用单独的连接器来简化安装和建立电源连接（7.12.1、22.102、24.1.5、24.1.10 1、25.3）； d)与远程操作相关的说明（22.40、22.49、22.51）。 本第2部分应与最新版本的IEC 60335-1及其修订一起使用，除非该版本排除了本第2部分；在这种情况下，使用不排除它的最新版本。它是在该标准第六版（2020年）的基础上建立的。

IEC 60335-2-51:2023 CMV contains both the official standard and its commented version. The commented version provides you with a quick and easy way to compare all the changes between IEC 60335-2-51:2023 edition 5.0 and the previous IEC 60335-2-51:2019 edition 4.0. Furthermore, comments from IEC TC 61 experts are provided to explain the reasons of the most relevant changes, or to clarify any part of the content.

IEC 60335-2-51:2023 deals with the safety of electric stationary circulation pumps for house-hold and similar purposes intended for use in heating systems or in service water sys-tems, their rated voltage being not more than 250 V for single-phase appliances and 480 V for other appliances including direct current (DC) supplied appliances. The hydraulic and electrical parts of the pump can be in the same enclosure, so that the water flows through the motor and serves as a coolant, or they can be separated. Appliances not intended for normal household use, but that nevertheless can be a source of danger to the public, such as appliances intended to be used by laymen in shops, in light industry and on farms, are within the scope of this standard. As far as is practicable, this standard deals with the common hazards presented by ap-pliances that are encountered by all persons in and around the home. However, in gen-eral, it does not take into account:
- persons (including children) whose physical, sensory or mental capabilities; or lack of experience and knowledge prevents them from using the appliance safely without supervision or instruction;
- children playing with the appliance.
Attention is drawn to the fact that
- for appliances intended to be used in vehicles or on-board ships or aircraft, additional requirements can be necessary;
- in many countries additional requirements are specified by the national health authori-ties, the national authorities responsible for the protection of labour and similar au-thorities.
This standard does not apply to
- pumps for circulating liquids other than water;
- pumps, other than circulation pumps (IEC 60335-2-41);
- circulation pumps intended exclusively for industrial purposes;
- circulation pumps intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour, or gas).
This fifth edition cancels and replaces the fourth edition published in 2019. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the pre-vious edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text (Clause 1);
c) the use of separate connectors to ease the installation and establish the supply con-nection has been introduced (7.12.1, 22.102, 24.1.5, 24.1.101, 25.3);
d) clarifications related to remote operation (22.40, 22.49, 22.51).
This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its amendments unless that edition precludes it; in that case, the latest edition that does not preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.