Surge Arrester for Telephone Lines – RJ11 Sockets

Surge Arrester for Telephone Lines – RJ11 Sockets

Type: C2, C3
Location: ST 2+3

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Product Information:

Surge arrester for telephone lines – RJ11 sockets protects a single pair of high-speed analogue lines in telecommunication equipment (eg VDSL2).


  • Provides “coarse” and “fine” protection
  • Protects AC and DC systems

Benefits: Simple installation. Universal plastic adapter for mounting on DIN rail and GND 2 holder

Standards: EN 61643-21 (Surge Protection Devices)

Application: Install inline for protection of telecommunication equipment on high-speed analogue lines.

More Information:

Where low voltage, data and telecom lines enter and exit the building, they must also be included in the Lightning Protection System. These include:

  • Electromagnetic shielding
  • Telephone lines
  • Data communication lines
  • Instrumentation, control, signalling lines
  • Coaxial lines for CCTV, TV, & antenna cables

A surge or lightning protection device prevents damage to electrical and electronic equipment from transient over-voltage events by blocking or redirecting surge current to the ground instead of passing through the equipment.

By their nature, low voltage, data, and telecom lines are not as robust as mains power cables and as such do not carry the same magnitude of lightning current. However, the size of that voltage/current is large in comparison to the system operating voltage and, as such, these lightning-induced transients can still cause irreparable and expensive damage.

Since transients can be induced from the large electromagnetic field created during a lightning strike, care needs to be taken over the routing of such cables.

When selecting a data, telephone or low voltage protector, extra care must be taken to ensure that clamping performance of the SPD does not impede the data/signal transmission voltage.

Electrical Specification:

Order number
Maximum operating voltage (AC/DC)Uc
114V AC/162V DC
Nominal load currentIL
C2 Nominal discharge current (8/20μs) per coreIn
C2 Voltage protection level mode core-core at lnUp
C2 Voltage protection level mode core-PE at lnUp
C3 Voltage protection level mode core-core at 1kV/μsUp
C3 Voltage protection level mode core-PE at 1kV/μsUp
Response time core-coreta
Response time core-PEta
Serial resistance per coreR
Threshold frequency core-coref
Connection (input - output)
RJ11 sockets
Degree of protection
Range of operating temperatures (min - max)
-40°C - +80°C
DIN rail 35mm and GND2 holder
According to standard
EN 61643-21+A1,A2:2013, IEC 61643-21+A1,A2:2012 / C2, C3
ETIM Class
85g (nett), 100g (gross)

Dimensions and Wiring Diagram for Surge Arrester for Telephone Lines – RJ11 Sockets :