923
25
57
38
46
UN
Nominal operating Voltage
IN
Nominal impulse discharge current
IMAX
Total impulse current (L+N+PE)
ITOT
Max. total impulse current (L+N+PE)
UOC
Surge protection level [L-N] [L+N-PE]
UP
Voltage protection level [L-N] [L/N-PE]
Defender | Over Voltage Protection
UN
IN
IMAX
ITOT
UOC
UP
99341
230V AC 5kA
10kA
20kA
10kV
≤ 1.5kV
Surge arrester for T3 indirect discharges (CEI EN 61643-11/A11) with test classification III
(CEI EN 61643-11 Ed.1).
Multi-pole overvoltage limiter with spark gap and varistors connected in series to the active
phases.
Construction type combining priming with limitation.
Absence of leakage current.
No subsequent mains current due to the combined varistor / spark gap series.
Installation rules
The installation of only one unloader for each line may not be sufficient to
guarantee effective protection of the entire system.
All luminaires installed at a distance of 10 m from the arrester are
considered to be 100% protected.
If the length of the cable between the arrester and the luminaires exceeds
10 m, it is advisable to renew the protection by placing another arrester
near the devices to be protected (within 10 m).
In order to guarantee the maximum level of protection, install the arresters
according to the method described above for each line of the system.
