DEHNbloc Maxi 1 CI 440 / 760 FM
Coordinated Type 1 Lightning Current Arrester with integrated Backup Fuse
- Spark-gap-based lightning current arrester with integrated lightning current carrying backup fuse in a compact enclosure
- Extremely high lightning current discharge capacity of 35 kA (10/350 µs)
- Low voltage protection level (including backup fuse)
- High follow current extinguishing capability and limitation thanks to RADAX Flow technology
- Energy coordination with other arresters of the Red/Line product family
- Operating state / fault indication by green / red indicator flag in the inspection window
DEHNbloc Maxi 1 CI 760 FM: Coordinated single-pole lightning current arrester with integrated backup fuse, high follow current extinguishing capability and remote signalling contact for monitoring device (floating changeover contact) for UC = 760 V
With system applications getting more and more compact, it is difficult to install lightning current arresters in conformity with the standard. DEHNbloc Maxi CI allows space-saving integration of a type 1 arrester and is said to meet the protection requirements of modern switchgear installations.
Typical fields of application of this arrester are industrial plants with common nominal voltages of 400 / 690 V, IT systems of the chemical industry with nominal voltages of 500 V a.c., protection of the transformer on the low-voltage side of wind turbines and protection of the a.c. side of central inverters of photovoltaic systems.
The integrated backup fuse is dimensioned to ensure maximum discharge capacity and optimal system protection. Consequently, the need to select and install an adequate arrester backup fuse is eliminated, ensuring short connecting cable lengths as required in the IEC 60364-5-53 standard.
The proven spark gaps with wave breaker function and RADAX Flow technology are the core of the coordinated DEHNbloc Maxi CI 440 and 760 lightning current arresters. In case of spark-gap-based type 1 arresters, the full current flows through the type 1 arrester during the discharge process; similar to a wave breaker, the destructive energy is mitigated to a sufficiently low level, thus considerably relieving the downstream SPDs and the entire electrical installation. In addition to this wave breaker function, the RADAX Flow technology reduces and extinguishes mains follow currents to such a low level that even a 32 A gG fuse does not trip. This ensures high availability and longevity of the electrical installation.
The new enclosure concept allows flexible installation. Due to the typical installation environment, DEHNbloc Maxi CI is delivered with two mounting brackets so that the arresters can also be directly fixed on a mounting plate. However, the arresters can also be mounted on a DIN rail.
The operating state / fault indication of DEHNbloc Maxi CI, which also includes the fuse monitoring, needs no power to operate and instantly shows the status of the devices. Apart from the standard visual indicator with green and red flags, the devices feature a three-pole remote signalling terminal. With its floating changeover contact, the remote signal can be used as a break or make contact according to the particular circuit concept.