IEC 60947-7-3:20 09适用于带有螺钉型或无螺钉型夹紧单元的保险丝接线端子，用于连接刚性（实心或绞合）或柔性铜导体，用于接收符合IEC 60127-2的盒式保险丝链路，主要用于不超过1 000 V交流电、高达1 000 Hz或1 500 V直流、最大短路分断能力为1 500 A的电路中的工业或类似用途。它们旨在安装在带有外壳的电气设备中，外壳围绕保险丝接线端子，使得它们只能借助于工具才能接近。对于某些应用，例如在控制电路中，熔断器端子块可以专门设计用于短路保护。本标准的目的是规定熔断器接线端子机械、电气和热特性的安全要求和测试方法，以确保接线端子与标准化保险丝。本标准可用作 -需要将特殊装置固定到导体的熔断器端子块，例如快速连接终端或缠绕连接等； -熔断器端子块，其通过穿透绝缘的边缘或点提供与导体的直接接触，例如绝缘位移连接等。 在本标准中适用的情况下，使用术语“夹紧单元”代替术语“端子”。在参考IEC 60947-1的情况下考虑了这一点。自上次发布以来，本标准的主要技术修改如下: -关于间隙和爬电距离的要求被IEC 60947-1的附录H所取代； -8中改进的夹紧装置机械强度测试要求。3.3.1; -改进并参考IEC 60947-1表4的试验拧紧力矩要求； -8.5.2.5中规定的虚拟熔断器的电阻和尺寸要求。 本出版物应与IEC 60947-1:20 07和IEC 60947-7-1:20 09一起阅读。

IEC 60947-7-3:2009 applies to fuse terminal blocks with screw-type or screwless-type clamping units for the connection of rigid (solid or stranded) or flexible copper conductors for the reception of cartridge fuse-links in accordance with IEC 60127-2, intended primarily for industrial or similar use in circuits not exceeding 1 000 V a.c., up to 1 000 Hz or 1 500 V d.c., and having a maximum short-circuit breaking capacity of 1 500 A. They are intended for installation in electrical equipment with enclosures which surround the fuse terminal blocks to such an extent that they are accessible only with the aid of a tool. For certain applications, for example in control circuits, the fuse terminal blocks may be designed exclusively for short-circuit protection. The object of this standard is to specify safety requirements and test methods for the mechanical, electrical and thermal characteristics of fuse terminal blocks, to ensure the compatibility between terminal blocks and standardized fuse-links. This standard may be used as a guide for
- fuse terminal blocks requiring the fixing of special devices to the conductors, for example quick connect terminations or wrapped connections, etc.;
- fuse terminal blocks providing direct contact to the conductors by means of edges or points penetrating the insulation, for example insulation displacement connections, etc.
Where applicable in this standard, the term "clamping unit" has been used instead of the term "terminal". This is taken into account in case of reference to IEC 60947-1. The main technical modifications of this standard since this previous publication are listed below:
- requirements regarding clearances and creepage distances replaced by reference to Annex H of IEC 60947-1;
- requirements for the test of the mechanical strength of the clamping units improved in 8.3.3.1;
- requirements for tightening torques for the tests improved and referenced to Table 4 of IEC 60947-1;
- requirements for the resistance and the dimensions of dummy fuse-links specified in 8.5.2.5.

This publication shall be read in conjunction with IEC 60947-1:2007 and IEC 60947-7-1:2009.