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Description
2.5 Electronic trip unit ETU600
The voltage tap module requires an internal voltage tap on the upper or lower main
conducting paths in the circuit breaker.
For rated voltages greater than 1000 V, external voltage transformers must be used to
measure the system voltage.
Metering values
If a voltage tap module is retrofit on the circuit breaker, the following metering values are
available:
• Phase-to-phase voltage U
• Phase voltage U
• Active energy E
This makes the 3WA circuit breaker a PMF-I type measuring device (for definition, see
IEC 61557-12).
Test position
Before performing the insulation test of the power distribution equipment, the voltage
tap module must be pulled out into its test position. This provides galvanic isolation
between the electronics and the main circuit.
NOTICE
Damage due to lack of isolation
If the internal voltage converter is connected to the metering function during the
insulation test, damage may occur as a result.
Before the insulation test of the power distribution equipment, disconnect the internal
voltage converter from the metering function.
Note
Performing an insulation test without pulling the voltage tap module into its test position
may result in a failed insulation test. This will not affect the circuit breaker functionality.
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3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
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Troubleshooting
