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Surge Arrester for Telecommunications Efficient Protection

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Surge Arresters


Surge arrester for telecommunications

Efficient protection for ISDN

Combination of coarse and fine protection designed

to protect one pair of ISDN lines of telecommunication

equipment. It is installed at the boundary of LPZ 1–LPZ 2

zones and higher.


– universal plastic adapter for DIN rail assembling,

– adapter GND 2.

Technical data


Location SPD

ST 2+3

Maximum operating voltage Uc

120 V DC / 84 V AC

Nominal current IL

60 mA

C2 total nominal discharge current (8/20 μs) line - PE In

10 kA

C2 voltage protection level line - line at In UP

260 V

C2 voltage protection level line - PE at In Up

150 V

C3 voltage protection level line - line at 1 kV/μs Up

180 V

C3 voltage protection level line – PE at 1 kV/μs Up

500 V

Series resistance per line R

6,8 Ω

Threshold frequency fG

50 MHz

Response time line - line ta

1 ns

Response time line - PE ta

1 ns

Degree of protection

IP 20

Range of operating temperatures

– 40 °C … + 60 °C

Connection input – output


Mounting on

surface on the desk/DIN rail

Cross-section of connected conductors

ISO: 2,5 mm2 ; AWG: 13

Meets the requirements of standard

EN 61643-21


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