KNFDB Series Of Serial Signal Lightning Protection Gate
KNFDB series of serial signal lightning protection gate is mainly used for information technology equipment
and equipment from lightning and lightning electromagnetic pulse caused by induction over voltage
protection, with overvoltage protection road (primary and fine grade protection) plug-in adapter,
equipped with a D-Sub plug (9, 15 and 25 pin)
Working Conditions
▪ working temperature:-40℃~ +80℃
▪ relative humidity:5％~ 95％
Technical Parameter
KNFDB | 2504-D | 2509-D | 1509-D | 904-D | 904-DH | 909-L | ||||||
Nominal voltage | UN | 12V | 8V | 12V | ||||||||
Maximum continuous operating voltage | UC | 12.5V | 8.5V | 12.5V | ||||||||
Nominal current | IN | 400mA | ||||||||||
Nomina discharge current (8/20μs) | In | L—S 2.5KA;S—PG 5KA | ||||||||||
Limit voltage, at 1n | L—S | Up | ≤20V | ≤15V | ≤20V | |||||||
S—PG | ≤600V | ≤20V | ≤200V | |||||||||
Transmission frequency | fG | 1MBit/s | ||||||||||
insertion loss | Ae | ≤0.5dB | ||||||||||
response time | tA | ≤1ns | ||||||||||
Protection level | IP40 | |||||||||||
Connection head form | 25-pin | 15-pin | 9-pin | |||||||||
Protection of large ones | L:2/3 SG:7 Pg:1 | L:2/3/4/5/6/8/20 SG:7 Pg:1 | L:2/3 SG:5 Pg:1 | L:2/9/4/1 SG:8 Pg:1 | L:1/2/3/4/6/7/8/9 SG:5 Pg:Shell | |||||||
Applications | RS232,RS422,SDLC,RS423,RS485,HDLC | |||||||||||
Installation And Maintenance
1.This product series in the protected equipment signal circuit, and close to the protected equipment.
2.The input and output cannot be reversed; the input is the lightning intruding end, output is connected with
the protection device.
3.For the normal work of SPD, grounding is very important, the grounding wire cross-sectional area is
no less than 4m square meters, and as short as possible.
4.Lightning protection gate without special maintenance, but its long-term energized, so need messenger to
inspect regularly, especially in the thunderstorm season, after the lightning strike, it should be inspection on
time, if found that the loop signal is abnormal, removing protection gate, loop signal will back to normal, it
means Lightning protection gate has been damaged or life has ended, replace the new lightning protection
gate on time.
5.The outside length of Coaxial line more than 30m,it should be in the coaxial two ends with lightning
protection gate to ensure the best lightning protection effect.
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