Circuit protection devices with communication and metering function
3.5 3NA COM fuse
Circuit protection devices with communication and metering function
18 System Manual, 06/2021, L1V30827018B-01
The 3NA COM fuse is available in size NH2 and operating class gG or gFF. It can be easily
retrofitted in the existing fuse-disconnector due to its standard-compliant dimensions and
auxiliary power. The whole fuse module is composed of an electronic module and a fuse link
with nominal currents between 80 ... 315 A. The fuse link can be easily replaced once the
fuse has been tripped. It is not imperative to renew the electronic module, however, the
functions should be checked after re-commissioning. A test must be performed with a
suitable reference measuring instrument and the exchanged components must be
documented in an appropriate manner (e.g. in the form of a test label and electronic
recording).
The electronic module provides the communication and metering function with an integrated
metering and supply converter, where an additional connection for the supply voltage is not
required. A min. current flow of 5 A is required in order to ensure the communication and
metering function. Together with the fuse link, the electronic module forms the complete
system of the 3NA COM fuse.
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