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Description
2.9 Electronic trip unit ETU
Protection
Enhanced protective function
Communication
Metering function
The wake-up threshold for the electronic trip unit is approximately 10% of the rated current I
of the circuit breaker but at least 80 A in all three phases. If the current falls below these
max
values, the electronic trip unit will not be ready for use.
Note
Wake-up threshold if the electronic trip unit has an external power supply
The wake-up threshold if the electronic trip unit has an external power supply is approximately
0.03 x I
There is no requirement regarding a minimum current in all three phases.
44
ETUs of the 3-series
.
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Electronic
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—
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3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
Electronic with display
ETUs of the 6-series
•
2nd parameter set (set A/B)
•
Making current release (MCR)
•
DAS - Arc fault mitigation
•
Ground fault protection in the neu‐
tral point
•
Phase unbalance
•
Further functions in conjunction
with metering function Advanced,
which include the voltage, the direc‐
tions of power flow in the protection
architecture or can detect residual
currents more precisely
Optional
Optional
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