DGM Type 1 Surge Arrester Two poles

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

Type 1
Iimp : 12.5 kA

Application

The DGM is a compact (two-pole) Type 1 AC Surge Protection Device (SPD) dedicated to be connected
at the entrance of the electrical installation. Particularly useful in a high lightning density area, this SPD is designed to provide an efficient protection for sensitive equipment against over voltage due to lightning effects or industrial interferences.
The DGM is a single-phase SPD and can be also used for 3-phase N AC networks protection (made of 2 DGM).
Protection is based on high energy varistors diagram which is able to channel currents of up to 100 kA to
earth without incurring damage. According to the latest issue of IEC 62 305 and IEC 60 364 standards,
it is compulsory to install those surge arresters on the incoming power supply if the building is fitted
with external lightning protection system. Multiple stage protection can be achieved using DGM
surge arresters at the network entrance combined with DGT or DGX surge
arresters positioned as close as possible to sensitive equipments.

Installation

• Positioning:
  The DGM surge arrester is used as primary protection for 1 or 3-phase AC networks which are particularly exposed (Type 1 surge arrester). It is therefore installed on the site’s main low voltage switchboard.
• Mounting:
  The DGM 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 35mm². The cross-sectional earthing cable must equal half that of the main protection cable of the installation with a minimum of 6 mm² and a maximum of 35 mm².
  If external lightning protection system is fitted, the minimum cross-sectional area will be 10 mm².

Service continuity, failure indicator
Service continuity of the DGM is provided by an internal thermal security 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.
The DGM is also equipped with remote signalling contact.
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 125A or in relation with the short-circuit current of the installation.

 

Description	Ref.	Dimensions (m)	Weight (kg)
DGM Type 1 Overvoltage Arresters	P8320E	0.09 * 0.067