IEC 60947-7-4:2013 Low-vOLTAGE sWITCHGEAR AND CONTROLGEAR-Part 7-4: Ancillary equipment-PCB terminal blocks for copper conductors
1 General
1.1Scope
This part of lEC 60947 specifies requirements for PCB terminal blocks primarily intended forindustrial or similar use.
Mounting and fixing on the printed circuit board is made by soldering, press-in or equivalentmethods to provide electrical and mechanical connection between copper conductors and theprinted circuit board.
This standard applies to PCB terminal blocks intended to connect copper conductors,with orwithout special preparation，having a cross-section between 0,05 mm2 and 300 mm2(AWG30/600 kcmil), intended to be used in circuits of a rated voltage not exceeding 1 000 v a.c.upto 1 000 Hz or 1 500 V d.c.
NOTE1 Large cross section terminal blocks are dedicated to specific design of high current PCBs. The range upto 300 mm3 is kept to cover any possible application.Examples of high current PCBs and PCB terminal blocks areshown in Annex c.
NOTE 2 AwG is the abbreviation of “American Wire Gage”(Gage (uS) = Gauge(UK));kcmil = 1 000 cmil;
1 cmil = 1 circular mil = surface of a circle having a diameter of 1 mil;1 mil = 1/1 000 inch.
This standard may be used as a guide for special types of PCB terminal blocks withcomponents,such as disconnect units,integrated cartridge fuse-links and the like.
lf applicable，in this standard the term “clamping unit”is used instead of “terminal".This istaken into account in case of references to lEC60947-1.
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