The cross-section of the arrester earth conductor is determined, as with the main equipotential bonding
conductors, according to table 1. The conductor must have 0,5 times the cross-section of the main
protective conductor, the upper limit is fixed at 25 mm
2
Cu. A lower limit of 10 mm
2
Cu is required.
Cross section mm
2
Main protective conductor
- from the power source or
- house service box or main distribution board
outgoing protective conductor.
≤ 16
25
≤ 35
Supply conductor ≤ 35 50 ≥ 70
Earth conductor of arrester 10 16 25
Table 1
3. Functional check
PU overvoltage arresters must be subjected to a visual inspection, especially during thunderstorms. If
the colour of the inspection window turns red, the arrester must be replaced by trained service personal.
3.1 Maintenance
If the charge eliminator shows a red window as in 3., it must be replaced with a new one by trained
service personal. The individual charge eliminators are pluggable and encoded according to their
voltage. The varistor arrester must be removed when measuring the insulation resistance according to
DIN VDE 0100 part 610. To remove, pull on the upper parts of the varistor.
The charge eliminator compatible with the rated voltage of the plant must be re-installed.
Technical Data: PU xC PU xC PU xC PU xC PU xC PU 3+1 C PU 3+1 C
Max. Voltage V~ U
c
280 385 75 130 550 280 385
Rated diversion current i
sn
20 kA 20 kA 15 kA 20 kA 20 kA 20 kA 20 kA
of top part
Max. test current per Unit
1-way block i
smax
40 kA 40 kA 15 kA 40 kA 40 kA 40 kA 40 kA
2-way block i
smax
70 kA 70 kA 40 kA 70 kA 70 kA
3-way block i
smax
100 kA 100 kA 100 kA 100 kA 100 kA
4-way block i
smax
100 kA 100 kA 100 kA 100 kA 100 kA 100 kA 100 kA
Operating temperature range
.
- 40 °C to + 80
°
C
Conductor size 16- 25 mm
2
(stranded wire) 6- 10 mm
2
(solid wire)
10 - 25 mm
2
(flexible )
Assembly Snap-on mounting on 35 mm top-hat rails
according to DIN 43 880 A1. draft 6.81
Colour
.
Light grey, RAL 7035 orange orange
Material
.
Polyamide 6.6
Protection IEC 529 : IP 20
Dimensions
1-way block complete width 18 mm
2-way block complete width 36 mm
3-way block complete width 54 mm
4-way block complete
.
width 72 mm
Depth
.
55.0 mm
• For DC-Applications please contact the manufacturer.
4. Connection of remote signalling unit
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