Page 56 - Surge-Protection-E_0.pdf

Surge Arresters – Type 2
Advance d Circuit Interruption
ACI
Improved SPD Safety
DEHNguard modular with Advanced Circuit Interruption (Safe Dimensioning)
• New technology “Advanced Circuit Interruption” (ACI) inte-
grated in the protection module, consists of a switch / spark
gap combination
• Due to ACI technology no external backup fuse required
• Small connection cross-sections (6 mm² Cu) absolutely
sufficient *)
• TOV withstand also at 440 V (AC)
• High system reliability, no tripping of 32 A gG fuses
• Zero leakage current due to galvanic isolation by ACI
switch unit
• Energy coordination with other arresters of the Red/Line
product family

For protecting low-voltage consumer installations against surges. For installation *) All live conductors should be wired so that they are inherently
in conformity with the lightning protection zone concept at the boundaries from short-circuit and earth fault proof
0B – 1 and higher.

DEHNguard M TNC ACI 275 FM: Modular surge arrester with integrated ACI technology for TN-C systems
DEHNguard M TNS ACI 275 FM: With integrated ACI technology for TN-S systems
DEHNguard M TT ACI ... FM: With integrated ACI technology for TT and TN-S systems (3+1 configuration)
DEHNguard M TN ACI 275 FM: With integrated ACI technology for 230 V TN systems
DEHNguard M TT 2P ACI ... FM: With integrated ACI technology for 230 V TT and TN systems (1+1 configuration)
DEHNguard S ACI ... FM: Modular single-pole surge arrester with integrated ACI technology
DEHNguard M/S ... ACI ... FM: With remote signalling contact for monitoring device (floating changeover contact)

The new modular surge arrester of the DEHNguard ACI product family TOV withstand: Increase availability
provides safety at the highest level. This is thanks to ACI technology Temporary overvoltages (e.g. caused by loss of neutral) can destroy
(Advanced Circuit Interruption) which replaces the backup fuse with a conventional surge protective devices. The new DEHNguard ACI has
switch / spark-gap combination connected in series with a high capacity a much better TOV withstand and provides protection without device
varistor. failure even at 440 V (AC). This increases the availability of your system
At the end of the service life of the ACI surge arrester, the new technology and avoids wasting time and money on troubleshooting and repairing
reduces any fault current to such an extent that not even the smallest unnecessary damage.
fuses in the system are tripped. This means much greater availability and
operational safety for the system in comparison with standard type 2 ar- Zero leakage current: Increase service lifetime
resters with external fuses. Due to the construction of DEHNguard ACI there s no leakage current.
This prevents premature ageing of the protective device so that no time
The new internal arrester backup fuse has further advantages: and money is wasted on replacement. DEHNguard ACI arresters also con-
tribute towards operational safety because they prevent the accidental
Safe dimensioning: Eliminate mistakes tripping of the insulation monitoring.
The new technology prevents design errors which might occur when Transition in the energy sector: Fulfil future requirements
dimensioning or selecting overload protection; thus eliminating the
Surge Arresters – Type 2 need for a backup fuse. With ACI, protection is directly integrated in the network parameters change, e.g. as a result of renewable power gen-
With ACI arresters you are safely equipped for the future – even if
arrester and, as a result, optimally adjusted to it. DEHNguard ACI auto-
eration. Isolated grids and storage systems change the short-circuiting
matically eliminates the possibility of faulty installation or dimensioning
conditions.
errors. The arrester also leaves more space in the switchgear cabinet as
there is no need for an additional upstream backup fuse. In addition to
the condition of the varistor, that of the switch / spark-gap combination is DEHNguard ACI – Maximum system availability
also signalled and notified via the tried and tested mechanical operating System downtimes caused by an upstream safety device tripping or
state / fault indicator. being switched back on are a thing of the past. This means much greater
availability and operational safety for the system in comparison with
Conductor cross-section of only 6 mm²: Easier to install standard type 2 arresters with external fuses.
A conductor cross-section of 6 mm² is always enough for the active con-
ductors and PE. You save the valuable time you would, in the past, have
spent dimensioning the cross-sections. 6 mm² Cu also makes installation
easier because the bending radiuses are smaller. DEHNguard ACI there-
fore allows shorter wiring.

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