DGX Type 2 or Type 3 Surge Arrester

Family : Surge protection
Category : Surge protection devices for low voltage power equipment

Application
The DGX is a modular Type 2 (or type 3) 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 DGX is a one-pole SPD and can be used in common mode (DGX connected between L/PE and
N/PE = CT1 configuration) or common and differential mode (DGX 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 10 kA to earth
without incurring damage. DGX surge arresters are mainly used combined with Type 1 surge arresters
at the AC network entrance and possibly Type 2 surge arresters (DGT) positioned upcircuit distribution
panel.
The DGX is built with a plug-in module and a fixed base, which allows an easy and fast maintenance.

Installation

• Positioning:
  The DGX surge arrester can be used as secondary type 2 or type 3 protection for 1 or 3-phase AC
  networks. It is therefore installed as close as possible to the equipment to be protected.
• Mounting:
  The DGX surge arrester is DIN rail compatible.
• Wiring:
  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, malfunction indicator

Service continuity of the DGX 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 ( DGX…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 20 A or in relation with the short-circuit current of the installation.

 

Description	Ref.	Dimensions (m)	Weight (kg)
Replacement Plug-in Module DGX 400S	P8450E	0,05 x 0,045	0,036
Replacement Plug-in Module DGX 230S	P8451	0,05 x 0,045	0,032
Replacement Plug-in Module DGX 120S	P8452	0,05 x 0,045	0,028
DGX 400S Overvoltage arrester	P8436E	0,09 x 0,067	0,104
DGX 230S Overvoltage arrester	P8437E	0,09 x 0,067	0,100
DGX 120S Overvoltage arrester	P8438E	0,09 x 0,067	0,098
DGX 400 Overvoltage arrester	P8406E	0,09*0,065	0,098
DGX 230 Overvoltage arrester	P8400E	0,09 x 0,067	0,084
DGX 120 Overvoltage arrester	P8401E	0,09 x 0,067	0,098