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Measured values of the ETUs of the 3-series
Total number of trips
Operating hours counter
Contact wear
Date of maintenance performed
Direction to perform necessary mainte‐
nance
Key data
Self-diagnostics
Open-circuit detection
Watchdog: constant CT monitoring, moni‐
toring of the electronics and tripping coil
Temperature (T)
1)
If auxiliary power supply is connected
Metering functions of the ETUs of the 6-series
The electronic trip units of the 6-series can be expanded with the metering functions MF Basic
or MF Advanced. These measure the voltage between the phases with internal voltage tap -
optionally on the incoming or outgoing feeder side, i.e. internally before or after the contact
interruption point - and can therefore calculate and transmit values for power, energy, phase
difference, etc., taking the current signals into consideration.
• MF Basic provides many measured values in accordance with IEC 61557‑12
• MF Advanced provides not only the measured values described but also many enhanced
protective functions, which are listed in Chapter Parameters of the trip units (Page 66). In this
way, the ETU can also power the metering module MF Advanced directly from the busbar
itself if no auxiliary power supply is provided via the Breaker Connect module. Faults such as
overvoltages in the power system can therefore be detected before the contacts of the circuit
breaker are closed.
Metering functions of the ETUs of the 6-series
Instantaneous values
Currents (rms value)
Ground-fault current
Phase-to-phase voltage (rms value)
Phase-to-neutral voltage (rms value)
Phase sequence
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
No.
—
h
—
%
Pre-alarm > 80%
Alarm = 100%
Last
––
Type of circuit breaker, name assigned to the device, serial number
Parameter
Alarm due to discon‐
nection Current trans‐
former, rating plug,
tripping coil
Pre-alarm and alarm
due to overheating
Measured val‐
ues
A
L1, L2, L3, N
A
I
g
V
U12, U23, U31
V
U1, U2, U3
—
Precision
Optional: Only alarm or tripping of the circuit
breaker
Precision
Reference standard: IEC 61557-12
1%, Class 1
Fixed lower current transmission limit
= 3% I
n
2%
0.5%
0.5%
—
Description
2.9 Electronic trip unit ETU
Metering mod‐
ule MF required
—
—
●
●
●
77
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