Page 40 - Surge-Protection-E_0.pdf

Coordinated Lightning Current Arresters – Type 1
WBF
DEHN-FUNKENSTRECKEN-TECHNOLOGIE INSIDE
WELLENBRECHER-FUNKTION
DEHNbloc Maxi
• Encapsulated RADAX Flow spark gap with high follow current
limitation
• No tripping of 32 A gG fuses up to short-circuit currents
of 50 kArms
• High lightning current discharge capacity
• Directly coordinated with DEHNguard ... and V(A) NH ... surge
protective devices without additional cable length
• NH00 design
• Low voltage protection level

For protecting low voltage consumer installations against surges and even direct
lightning strikes. For installation in conformity with the lightning protection zone
concept at the boundaries from 0A – 1.

DBM NH00 255: Coordinated single-pole lightning current arrester in NH00 design with high follow current limitation for UC = 255 V
Lightning Current Arresters – Type 1 The coordinated DEHNbloc Maxi ... lightning current arresters adapt them-

selves to every kind of application. Whether being used in an exposed
position or in harsh industrial environments: DEHNbloc Maxi ... always
offers the right solution. The single-pole devices are coordinated with the
proven DEHNguard and V(A) NH surge arresters of the Red/Line family.
Irrespective of cable lengths and without requiring additional decoupling
coils, the surge protection concept can be adapted individually to the
special conditions of the installation.
DEHNbloc Maxi arresters provide the patented encapsulated creepage
discharge spark gap and RADAX Flow follow current limitation. This
means that special safety distances from busbars or other equipment are
not required and backup fuses are not tripped due to a lack of selectivity
between the protective device and any overcurrent protection system,
thus ensuring maximum system availability.
DEHNbloc Maxi NH00 255 was specifically designed for industrial distri-
bution boards and supply systems and allows compact and space-saving
installation in NH00 fuse holders or disconnectors depending on the par-
ticular system.

DEHNbloc Maxi NH00 255
900 255 DBM NH00 255
Coordinated single-pole lightning current arrester in NH00 design for TN-C and TN-S systems with a nominal voltage of 230 / 400 V.
900 255 4013364125773 04 01 01 09 194 g
189,50 €
Type DBM NH00 255
Part No. 900 255
SPD according to EN 61643-11 / IEC 61643-11 type 1 / class I
Max. continuous operating voltage (a.c.) (UC) 255 V (50 / 60 Hz)
Lightning impulse current (10/350 µs) (Iimp) 25 kA
Voltage protection level (UP) ≤ 2.5 kV
Max. backup fuse (L) up to IK = 50 kArms 315 A gG

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