Accessories
4.9 Communication and system integration
3VA molded case circuit breakers with IEC certificate
488 Manual, 03/2019, A5E03603177010-03
Working in conjunction with the connected 3VA molded case circuit breakers with ETUs 5-
series and 8-series, the COM800/COM100 breaker data server supplies the following
information about the power distribution system:
● Condition of the 3VA molded case circuit breaker
● Tripping history with time stamp, cause of trip and number of trip events for breakers with
ETUs 5-series and 8-series
● Minimum and maximum values of measured variables
● Limit-value monitoring for measured variables in the 3VA molded case circuit breakers
● Load curves with power demands, e.g. 15-minute demands
● Energy values such as active energy (kWh) and reactive energy (kvarh)
● Power supply to connected 3VA molded case circuit breakers
● Three simultaneous communication connections via the integrated Ethernet interface
(e.g. DSP800, powermanager and, temporarily, powerconfig)
Electronic trip units allow detailed setting of protection parameters from a central location.
They record measured variables and maintenance information in order to support power and
installation monitoring.
The electronic trip units (ETUs) provide the following protection functions:
● Overload protection L ("L" = Long time)
● Short-time delayed short-circuit release S ("S" = Short time) for time-selective response in
case of a short-circuit
● Instantaneous short-circuit release I ("I" = Instantaneous)
● Protection of the neutral conductor against overload and short-circuit ("N" = neutral)
● Protection against residual currents to ground G ("G" = Ground fault)
Communication-capable ETUs are deployed for any application which requires the following
functions:
● Diverse protection functions
● Finer setting options for protection functions
● Metering functions
● For 50 and 60 Hz networks (45 to 65 Hz)
● The communication option provides a wide range of information about the status of the
molded case circuit breaker, as well as the actual measured values.
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