DGT Type 2 Surge Arrester One pole
Surge protection devices for low voltage power equipment
The DGT is a modular Type 2 AC Surge Protection Device (SPD) dedicated to protect sensitive
equipment against over voltage which may occur in the AC network during a storm (lightning)
or during switching electric power sources (industrial interferences).
The DGT is a one-pole SPD and can be used in common mode (DGT connected between L/PE and
N/PE = CT1 configuration) or common and differential mode (DGT connected between L/N and 1xDGE
between N/PE = CT2 configuration).
Protection is based on high energy varistor which is able to channel currents of up to 40 kA to earth
without incurring damage. Multiple stage protection can be achieved using DGT surge arresters
combined with Type 1 surge arresters at the AC network entrance and/or Type 3 surge arresters
(DGX) positioned downcircuit.
The DGT is built with a plug-in module and a fixed base, which allows an easy and fast maintenance.
Service continuity, failure indicator
The DGT surge arrester can be used as primary or secondary protection for 1 or 3-phase AC networks.
It is therefore installed on the site’s main low voltage switchboard or in a distribution panel as close as
possible to the equipment to be protected.
The DGT surge arrester is DIN rail compatible.
Connection cables between SPD and the lines to be protected must be identical in cross-sectional
area to the lines with a maximum of 25mm². The cross-sectional earthing cable must equal half that
of the main protection cable of the installation with a minimum of 4 mm² and a maximum of 25 mm².
If external lightning protection system is fitted, the minimum cross-sectional area will be 10 mm².
Service continuity of the DGT is provided by an internal thermal security, connected in series with the
varistor, which disconnects the SPD from the AC network in case of failure. In such case, the user will
be warned by an indicator in front of the SPD. Version with remote signalling contact for disconnection
indication is also available (DGT…S).
To comply with the standards, an external electrical disconnection is necessary.
The user must install on each SPD branch, a protection against short-circuit current (fuses or breaker).
The rating of this fuse must be 50A or in relation with the short-circuit current of the installation.
|Description||Ref.||Dimensions (m)||Weight (kg)|
|DGT 230 Overvoltage arrester||P8410E||0,09 x 0,067||0,108|
|DGT 400 Overvoltage arrester||P8416E||0,09 x 0,067||0,118|
|DGT 120S Overvoltage arrester||P8435E||0,09 x 0,067||0,110|
|DGT 230S Overvoltage arrester||P8434E||0,09 x 0,067||0,116|
|DGT 400S Overvoltage arrester||P8433E||0,09 x 0,067||0,122|
|Replacement Plug-in Module DGT 120S||P8472E||0,05 x 0,045||0,040|
|Replacement Plug-in Modul DGT 230S||P8471E||0,05 x 0,045||0,046|
|Replacement Plug-in Modul DGT 400S||P8470E||0,05 x 0,045|
|DGT 120 Overvoltage arrester||P8411E||0,09 x 0,067||0,104|