The universal suitability of the busbar supports for different bar formats greatly reduces stocking needs.
The 3-fold support SH3 has a phase center spacing of 60 mm and can therefore be used for all operating equipment, such as NH isolators or power switches with 60 mm phase spacing.
When it comes to short-circuit current, a distinction is made between surge current and continuous short-circuit current. It is the continuous short-circuit current that is responsible for heating the conductor. It is proportional to the current square I² and the duration of the short circuit t.
The surge current generates the maximum force that is exercised on the current-carrying conductors and therefore on the supports. The spacing between two neighboring supports can be changed to absorb the forces of the maximum expected surge current. This dependence for supports SH1 and SH3 is shown in the diagram. With a given current, this permits calculation of the maximum admissible spacing between the busbar supports for different bar formats. The maximum spacing differs between busbar supports.
With a Cu bar measuring 30x10 mm and a support spacing of 250 mm, the maximum short-circuit current is 110 kA
For upright busbar mounting, 3-pole and 4-pole for 10 mm bars.
The busbar supports are used to create a 3 or 4-pole busbar system with conductor heights from 30 – 100 mm. The bar can have both individual conductors and double conductors per phase. Different phase center spacings permit adaptation of the busbar system to different room dimensions or concepts with different short-circuit strengths. The nominal operating voltage according to IEC 61439 is 1000VAC or 1500VDC.
The data on short-circuit current is listed under the link in the info box. The busbar supports are made of glass fiber-reinforced polyamide 6.6 and are self-extinguishing in line with UL 94 V0. The material permits a maximum bar temperature of 120°C and is halogenfree. The top and bottom sections of a support are identical, thereby ruling out the problem of interchanging. The two support sections are connected to each other via threaded rods or threaded bolts. The spacing of the support sections is defined by so-called spacers to suit the bar height.
5 supports are required for laying within a switch cabinet. This is why the busbar supports are available in packs of 10, equivalent to 5 supports.
The length of the required threaded rods depends on the bar height plus the length for securing of the support on the base structure.
The desired conductor thickness can be achieved by coordinating the positions of the top and bottom sections relative to one another. The diagram shows you how to do this:
1 The aforementioned current was tested with an increase of 30 k above the ambient temperature of 35° C in accordance with IEC 61439.
Both connectors have the same outer dimensions and are suitable for the same mounting parameters:
|Total length: 112mm
|Connector insert length after mounting: 80mm
|Connector width: 48mm
|Thickness of mounting plate: 1.5 - 3 mm|
We recommend the use of contact grease for plug connections.
N.B. Plug connectors may only be connected and disconnected in no-load state!
Recommended cutout for the plug connectors