Connect in series with the telephone line or ISDN
line. These units are usually installed close to the equipment being
protected and within a short distance of a good electrical earth.
Electrical specification
ESP TN/JP
ESP TN/RJ11-2/6
ESP TN/RJ11-4/6
ESP TN/RJ11-6/6
ESP ISDN/RJ45-4/8
ESP ISDN/RJ45-8/8
Max working voltage¹
-Line to line
-Line to earth
190V
190V
190V
190V
190V
190V
190V
190V
5V
58V
5V/58V²
58V²
Current rating (signal)
300mA
300mA
300mA
300mA
300mA
300mA
In-line resistance
(per line ± 10%)
4.4ohm
4.4ohm
4.4ohm
4.4ohm
4.4ohm
4.4ohm
Bandwidth
(-3dB 50ohm system)
>50MHz
>50MHz
>50MHz
>50MHz
>50MHz
>50MHz
1 Maximum working voltage (DC or AC peak) measured at <95µA
leakage. Post transient recovery voltage >80V.
Transient specification
ESP TN/JP
ESP TN/RJ11-2/6
ESP TN/RJ11-4/6
ESP TN/RJ11-6/6
ESP ISDN/RJ45-4/8
ESP ISDN/RJ45-8/8
Let through voltage (all conductors)¹
5kV,10/700µs test to:
BS 6651:1999 Appendix C, Cat C-High
ITU (formerly CCITT) IX K17
-Line to line
-Earth to earth
200V
200V
200V
200V
200V
200V
200V
200V
27V
80V
27V/80V²
80V
Maximum surge current
10kA
10kA
10kA
10kA
10kA
10kA
1 The maximum transient voltage let-through the protector
throughout the test (+/-10%), line to line & line to earth. Response time
<10ns.
2 Tested with 8/20µs waveshape to ITU (formely CCITT), BS 6651:1999 Appendix C.The connectors may limit the capability of the protector.
