User Manual

Description
2.4 Electronic trip unit ETU600
3WA Air Circuit Breakers
74 Equipment Manual, 05/2021, 92310000002-03
2.4.2.5 Voltage tap module
A voltage tap module VTM is required for measuring the voltage and calculating further
metering values. It is available as an option for 3WA circuit breakers with rated voltage up to
1000 V and ETU600.
The voltage tap module is available in two versions:
• VTM680 voltage tap module
For 3WA circuit breakers with breaking capacity N, S, M, H, C and maximum rated voltage
690 V AC
Provides power to the ETU600 via the voltage applied in the power distribution system
• VTM640 voltage tap module
For 3WA circuit breakers with breaking capacity E and max. rated voltage 1000 V AC
No power supply for ETU600
The voltage tap module requires an internal voltage tap on the upper or lower main circuits 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 added to the circuit breaker, the following metering values are
available:
• Phase-to-phase voltage U
LL
• Phase voltage U
LN
• Active energy E
a
This makes the 3WA circuit breaker a PMF-I type measuring device in accordance with
IEC 61557-12.