Product description
3.3 Configuration
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03
25
In the case of an LCD display, the electronic trip unit must be activated. This requires a 3-
phase (3-pole) load current of at least 20% or, in the case of a single-phase (single-pole)
load, 30% of the relevant rated current of the molded case circuit breaker. If this load current
is not available, the necessary auxiliary energy can be supplied via a battery power supply
(order no. 3VL9000-8AP01). With communication-capable, molded case circuit breakers, the
trip unit is powered by means of the COM20 or COM21 module.
The handheld tester for electronic trip units is used as a local test device for the 3VL molded
case circuit breakers with electronic trip unit, and it can be used as an external voltage
supply for the electronic trip units (ETU and LCD-ETU). The portable battery power supply is
fed by two standard 9 V block batteries.
Test function:
● Test tripping
Figure 3-3 Battery supply device
4-pole molded case circuit breakers
The four-pole molded case circuit breakers for system protection can be supplied in all
4 poles with or without current transformers. The trip units in the 4th pole (N) can be set to
50% or 100% of the current in the 3 main current paths dependent on the size, so that safe
protection of the neutral conductor can be guaranteed even with a reduced cross-section. In
the case of LCD-ETUs, the neutral conductor protection can be adjusted in steps from 50%
to 100% or switched off.
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