Modular Terminal Blocks Catalogue 2012/2013

| Kategorie: Katalog  | Tento dokument chci!

Terminals, P-Series (PUSH IN technology) Terminals, Z-Series (Tension clamp technology) Terminals, W-Series, Stud terminals, SAK-Series (Screw connection technology) Shield connection terminals KLBÜ AccessoriesAppendix

Vydal: Weidmüller, s.r.o. Autor: Weidmueller

Strana 520 z 571

Vámi hledaný text obsahuje tato stránku dokumentu který není autorem určen k veřejnému šíření.







Poznámky redaktora
b) Overload protection With overload protection, cables and electrical components are protected against excessive load currents and the resulting thermal and mechanical damages. Overload currents can occur with the following electrical components: • Cables and busbars power distribution networks • Motors • Transformers When protecting against overloads, the heat energy released the fuse inserts extends over longer period time. The power loss for a short circuit overload determined based the terminal the middle. W Technicalappendix W. also shows the maximum permitted power losses for the fuse inserts various applications and terminal block alignments. Definition overload and short-circuit protection a) Short-circuit protection Short circuits can occur when the insulation broken when there is continued stress the insulating material.473 S1. 3. This is because only short pulse occurs with a short circuit.Definition overload and short-circuit protection Power losses This technical supplement should be used for determining the size fuse inserts and fuse terminal blocks.8 1282250000 2012/2013 . Thus the maximum power loss less than with pure short circuit.43 and 384. Fuse terminal blocks arranged individually accordance with IEC 60947-7-3 A single arrangement describes a terminal block consisting five terminals, whereby four feed-through terminals are arranged around fuse terminal block. The heat generated when fuse insert is activated short circuit low in comparison overload. Figure Fuse terminal blocks arranged composites The maximum power loss the fuse should, comparison the individual alignment, rated lower.4. Composite alignment fuse terminal blocks accordance with IEC 60947-7-3 A composite alignment describes a terminal block made from five fuse terminal blocks. Figure Fuse terminal blocks arranged individually The maximum power loss the fuse can, comparison compound alignment, rated higher because the individually aligned feed-through terminals dissipate little thermal energy. 2. Almost all electrical consumers and lines should be protected against short circuits according DIN VDE 0100-430/ HD 384. the case pure short circuit, the maximum permitted power loss the fuse insert should be higher than the level for the overload protection.4. 1. The fuse terminal blocks arranged a composite dissipate more thermal energy during operations