Description
2.7 Metering function (power metering function)
3WA1 air circuit breaker
134 Equipment Manual, 02/2023, 92310000002-06
The specified accuracies apply given the following reference conditions:
• Operating temperature 23 °C ±2 °C
• Relative humidity 40% to 60% RH
• Auxiliary power supply of 24 V DC ±1%
• Three-phase current system, 3 phases available
• Voltage unbalance ≤ 0.1%
• No DC component for voltage and current
• Sinusoidal waveform
• Frequency, rated frequency (50 Hz or 60 Hz) ±0.2 %
Interpretation of metering values
The energy flow direction must be set on the circuit breaker so that the metering values
can be accurately displayed. This can be done in menu item 5.2.2 using the operating
keys on the display of the ETU600 electronic trip unit or with the help of the SENTRON
powerconfig configuration software.
In accordance with Annex C of the standard IEC 61557-12, the user can select from three
definitions for the display of the power factor.
• IEC consumer (IEC-C)
• IEEE consumer (IEEE-C)
• IEC producer (IEC-P)
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