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Izoelektro - Model NNO 10/440 (l=0,5m) -Low Voltage Metal Oxide Surge Arrester
NNO is a low voltage metal oxide surge arresters with silicone coating. They are designed to be installed in LV power lines or in junction boxes up to 1 kV as the first level of protection against direct lightning strikes
Code (l = 0,5 m): 20 60 60
Characteristics: The disconnecting device reacts after a certain number of strokes when in normal operation the current through the surge arrester increases over 1 mA or in case of atmospheric discharge (current bigger than 65 kA).
General data
Response time: tA < 25 ns
Ambient temperature range: T = -40°C ... +85°C
Ingress protection level: IP 67
Coat: silicone LSR
Silicone colour: grey
Tested according to standard: IEC 61643-1 and IEC 61643-11
IEC class: II
Earthing conductor: H07V-K
Technical characteristics
Uc (AC/DC): 440/585 V
Up: < 1,80 kV
W: 3504 J
Weight (l = 0,5 m): 0,0971 kg
Weight (l = 1,0 m): 0,1037 kg
Standard packing:
- 100 pcs/box,
- box size: 400x240x185 mm
- weight: 6,5 kg
The position for installing NNO and MOSIPO surge arresters is decided by directives and technical regulations. They must be installed:
- on all branches and ends of low voltage overhead power lines,
- at a maximum mutual distance up to 1000 m,
- at a distance smaller than 500 m, where storms occur more often,
- in all passages from free conductors to cables and vice versa.