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The portable single-phase short-circuiting device with universal automatic clamp (type CAU) is used on flat busbars in medium-voltage switchgear.
The universal automatic clamp (CAU) variant can also be applied to spherical coupling points permanently mounted on flat busbars in medium-voltage switchgear.
Universal automatic clamps (CAU) have extruded aluminium-alloy bodies and a clamping screw with a bayonet coupling at one end for connection to the insulating stick.
|
Parameter |
Value |
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|
Earthing cable cross-section S p (mm2) |
16 |
25 |
35 |
50 |
70 |
95 |
120 |
|
Rated short-circuit current for t = 1s I sc (kA) |
3,5 |
6 |
8 |
12 |
16 |
20 |
30 |
|
Rated peak current for t = 0,02 s I sd (kA) |
8,75 |
15 |
20 |
30 |
40 |
50 |
75 |
|
Short-circuit test current for t = 1s (kA) |
4,6 |
6,9 |
9,2 |
13,8 |
18,4 |
23 |
34,5 |
|
Peak test current for t = 0,02 s (kA) |
11,5 |
17,25 |
23 |
34,5 |
46 |
57,5 |
86,25 |
|
Power factor (according to SR EN 61230) |
2,5 |
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| Phase cable length I f (m) | max. 1,5 | ||||||
|
Earthing cable length I p (m) |
max. 10 |
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|
Thickness of flat busbar accepting the phase clamp (mm) |
max. 37 |
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|
Diameter of spherical coupling point (mm) |
30 |
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The single-phase short-circuiting device includes the following components:
- universal automatic clamp (CAU) – 1 piece;
- earthing cable – 1 piece;
- earthing clamp – 1 piece.
The short-circuiting devices are supplied in sets of 3, in a carrying bag/case.
