UL 60947-7-4:2018 PDF Download

UL 60947-7-4:2018 is a standard that specifies the requirements for PCB terminal blocks used in industrial or similar settings. These terminal blocks are intended for mounting and fixing on printed circuit boards, using soldering, press-in, or equivalent methods. Their purpose is to provide electrical and mechanical connections between copper conductors and the printed circuit board.

This standard applies to PCB terminal blocks that are designed to connect copper conductors with a cross-section ranging from 0.05 mm² to 300 mm² (AWG 30/600 kcmil). These terminal blocks are suitable for use in circuits with a rated voltage not exceeding 1,000 V AC up to 1,000 Hz or 1,500 V DC. It should be noted that larger cross-section terminal blocks are specifically designed for high current PCBs, with the range going up to 300 mm² to accommodate various applications.

The standard also mentions that it can serve as a guide for specialized types of PCB terminal blocks that incorporate components such as disconnect units and integrated cartridge fuse-links. Additionally, it specifies that the term "clamping unit" is used instead of "terminal," which is consistent with the terminology used in IEC 60947-1.

An addendum to the standard includes modifications that expand its coverage to terminal blocks with insulation piercing or displacement clamping units. It also expands the wire range for terminal blocks, covering 0.051 mm² to 300 mm² for copper conductors and 3.31 mm² to 300 mm² for aluminum conductors. It should be noted that specific size restrictions for aluminum conductors exist in Mexico.