Page 86 - Surge-Protection-E_0.pdf

Surge Arresters – Type 2
DEHN DC Safety Technology
DCD D
 DC
DEHNguard ME/ SE DC ... (FM) DC-Disconnection
• Universal combined arrester / surge arrester consisting
of a base part and a plug-in protection module
• Device concept specifically developed for use in d.c. circuits
• Powerful d.c. switching device DCD prevents fire damage
caused by d.c. switching arcs
• Use without additional backup fuse in defined applications
• Operating state / fault indication by green / red indicator
flag in the inspection window
• Easy replacement of protection modules without tools due
to module locking system with module release button

For protecting low-voltage consumer's installations against surges. For installation
in conformity with the lightning protection zone concept at the boundaries from
0B – 1 and higher.

DEHNguard ME DC ... FM: Multipole combined arrester for d.c. applications up to 950 V
DEHNguard SE DC ...: Modular single-pole surge arrester for d.c. applications
DEHNguard SE DC ... FM: With remote signalling contact for monitoring device (floating changeover contact)

The modular devices of the DEHNguard SE DC product series are coordi- DEHNguard SE DC … FM version, the arrester status is additionally re-
nated single-pole type 2 surge arresters with a functional design. ported via a three-pole remote signalling terminal.
When developing this device series for protecting d.c. systems, the main The special design of the d.c. switching device DCD even ensures a
focus was on the increased requirements of d.c. applications with regard short-circuit withstand capability up to 300 A d.c. – without arrester back-
to device safety in all operating states. The extremely powerful d.c. switch- up fuse (!). In combination with the specified backup fuses, the short-cir-
ing device DCD, which prevents fire damage caused by switching arcs, is cuit withstand capability can be even increased to 25,000 A d.c., which is
the core of the DEHNguard SE DC devices. certainly an innovation in the field of d.c. applications.
DEHNguard SE DC … (FM) is coordinated with the corresponding type 1 The single-pole devices are available for voltages from 60 V to 900 V d.c.
DEHNsecure … (FM) lightning current arrester for the respective voltage. and thus DEHNguard SE DC type 2 surge arresters can be used for a vari-
The DEHNguard SE DC devices combine high performance and ease of use ety of applications such as emergency power supply systems, d.c. systems
in a single device. Their electrical parameters are rated for the most strin- for direct supply of d.c. drives, control circuits and battery-operated supply
gent requirements within lightning and surge protection systems. The high systems of any kind.
number of features shows that the main focus is both on reliable surge To implement these numerous features, the devices incorporate the mod-
protection and device safety. ular Red/Line family design with a width of 1.5 modules. The mechanical
Proven heavy-duty varistors are used to discharge high impulse currents design of the connection points is another safety feature. The covered
and limit the destructive surge impulses to the specified voltage protec- screws provide additional touch protection and the projections for easily
tion level values. The operating state of the arrester is permanently mon- and safely entering the cable increase clearances and creepage distances
itored via the surface temperature of the heavy-duty varistor and the d.c. so that no distance to other equipment must be maintained even in case
switching device DCD is immediately activated in case of overload. The of voltages up to 900 V d.c.
mechanical visual indicator with green and red indicator flags, which is The coded plug-in protection modules ensure a high degree of protection.
available for each protective path, is directly connected to the d.c. switch- Consequently, damage caused by installing an incorrect module can be
ing device DCD. When the red indication appears in the inspection win-
virtually excluded.
Surge Arresters – Type 2 dow, the d.c. switching device DCD has already safely interrupted the d.c. The universal T1 + T2 combined arrester is specially designed for use with
switching arc and thus reliably prevented fire damage. In case of the
direct current sources up to 950 V.

DEHNguard ME DC ... FM
972 146 DG ME DC Y 950 FM
Modular combined arrester for DC applications; with floating remote signalling contact.
972 146 4013364347960 04 01 02 15 497 g
380,10 €
Type DG ... ME DC Y 950 FM
Part No. 972 146 +
SPD analogous to EN 61643-11 / IEC 61643-11 type 1 + type 2 / class I + class II
Max. continuous operating voltage (d.c.) (UC) 950 V
Lightning impulse current (10/350 µs) (Iimp) 5 kA
Nominal discharge current (8/20 µs) (In) 12.5 kA
Voltage protection level [DC+ -> DC-] (UP) ≤ 4 kV
Voltage protection level [(DC+/DC-) --> PE] (UP) ≤ 3.2 kV
Max. short circuit withstand capability (ISCCR) 500 A / 170 ms
Approvals UL
Type of remote signalling contact changeover contact

82 You will find detailed product information on our website Valid as of August 1, 2020