Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
131
5-series and 8-series electronic trip units
Parameter input via display unit
With 5-series and 8-series electronic trip units, it is possible to set more parameters and to
scale the selection of parameters more finely than on 3-series trip units.
Parameters are set via the display unit and its buttons. This functionality is available,
however, only if a separate, dedicated power supply is connected to the molded case circuit
breakers.
Potential alternatives for this power supply:
● 24 V supplied externally via:
– EFB300 external function box
– temporarily connected TD300 or TD500 test device
– internal 24 V module
– internal COM060 communication module
● Current flow > 20% I
n
in one of the 3 phases
A description of the parameter display can be found in chapter "Operator controls
(Page 93)".
Additional features of 8-series units
In addition to the features shared with 5-series trip units, 8-series units also offer:
● With three-pole molded case circuit breakers, a voltage tap for each phase and the option
of connecting the potential of the neutral conductor
With four-pole molded case circuit breakers, four internal voltage taps are provided for
measuring the conductor voltages
● Additional measurement of power values (only possible with an external 24 V supply)
In order to avoid the display of small ghost currents (e.g. when the breaker is switched off),
all currents below 5% of rated current are displayed as "0" as standard. This threshold can
be changed using powerconfig.
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