Relax. It is a DEHNventil ACI.

The no-worries solution from DEHN: When work safety meets easy compliance with standards and maximum system availability, it is DEHNventil ACI. Surge protection has never been so simple and safe. The prewired DEHNventil ACI combined arrester (Type 1 + Type 2 + Type 3) provides safety in and at the supply point of the low-voltage switchgear installation. This makes the innovative ACI technology (Advanced Circuit Interruption) available for the first time in the Type 1 arrester class.

Innovative, detailed solutions such as an automatic disconnection function with visual display of voltage disconnection, three-sided module replacement options or a cross-sectional area of 16 mm² Cu that is always the same ensure maximum safety. 

Max. prospective short-circuit current: 100 kA_rms (220 kA_peak)
Integrated overcurrent protection  
Response time (t_A): ≤ 100 ns

What characterises the DEHNventil ACI

Innovative installation concept for greater work safety

An automatic, electrical disconnection function of the protection module in the event of a fault means that the module can be replaced safely during system operation and in compliance with industrial safety regulations. The dead protection module can also be removed from the side or front. This enables safe replacement in any installation situation.

Compliance with standards made easy

The absence of a backup fuse and direct mounting on an earthed DIN rail or busbar make it easy to comply with the cable length of maximum 0.5 m as specified in DIN VDE 0100-534.

Reliable dimensioning – times three

Save yourself questions about selectivity and cross-sectional areas as well as the time-consuming dimensioning of the backup fuse. The new DEHNventil ACI already has an integrated switch/spark gap combination which is precisely adapted to the arrester. This means: no backup fuse, no errors in dimensioning and always the same cross-section of only 16 mm² of copper.

Convenient installation

The compact system solution not only offers maximum flexibility, but also freedom in the positioning and connection of the surge arrester. The integrated switch/spark gap saves valuable installation space and enables flexible mounting on DIN rails, busbars or switchgear cabinet walls.

High system availability

The safe disconnection of the protection module from the power supply means that the system can continue to operate seamlessly when servicing is required. In ideal conditions, maintenance can be carried out during operation. This minimises costly downtimes. In addition, the DEHNventil ACI also offers the usual outstanding performance parameters in operation (100 kA of lightning current carrying capability / 100 kA of short-circuit current capability) with the best possible protection (Type 1 + 2 + 3 certification with terminal device protection).

Quick, easy and safe maintenance

An electrical status indication via remote signalling is integrated in the DEHNventil ACI as standard. In the event of a fault, the disconnection function isolates the protection module from the base module and thus safely from the power supply. This is visually indicated on all four sides of the arrester, providing safety for maintenance personnel. 

Technical features at a glance

For maximum system availability: DEHNventil ACI

DEHN has stood for innovation and technical progress for over 100 years. With the CI and ACI arresters, DEHN has created space-saving solutions for modern surge protection. CI stands for Circuit Interruption and means that an optimally dimensioned fuse is already integrated in the SPD (Surge Protection Device). With the ACI (Advanced Circuit Interruption) technology introduced in 2018, this fuse was replaced by a switch/spark gap combination. These and other innovative features make DEHNventil ACI the simplest and safest solution. 

Our arrester classes at a glance:

The "no-worries solution" from DEHN

ACI technology: For maximum safety in the switchgear cabinet

No more time-consuming dimensioning! Our Type 1 and Type 2 arresters with ACI technology have an integrated switch/spark gap combination. This replaces the otherwise necessary backup fuse. This provides safety, enables flexible installation and raises system availability to a new level. 

The DEHN ACI technology

Peak-level reliability and system availability 
Reliable dimensioning and space savings due to the elimination of the separate backup fuse 
Long service life thanks to high TOV withstand and zero leakage current
Easy installation due to a smaller cross-sectional area

To ACI technology