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4.11
Accessories for the ETU300 and ETU600 electronic trip units
4.11.1
Option plug
4.11.1.1
Description
The option plug determines:
• The current rating of the circuit breaker
• The basic protective functions of the electronic trip unit
Replacing the option plug makes it possible to adapt the circuit breaker to changes in
the power distribution equipment. The ground-fault protection for the electronic trip unit
can be retrofit and the current rating of the circuit breaker can be reduced in this way.
The permissible rated currents for the circuit breaker depend on the size and are listed
in Chapter Option plug (Page 46).
The option plug can be replaced.
Circuit breaker damage if operated without option plug
Circuit breakers with an electronic trip unit must not be operated without an option
plug.
Before closing the circuit breaker, check that an option plug is installed in the electronic
trip unit.
Circuit breaker damage if option plug is not replaced properly
Circuit breaker damage can result if the option plug is not replaced properly.
The option plug may only be replaced under the following conditions:
• The withdrawable circuit breaker is in the disconnected position
• or the fixed-mounted circuit breaker is open and the electronic trip unit is
• or the electronic trip unit is removed.
You will find more information in the operating instructions available on the internet
(https://support.industry.siemens.com/cs/ww/en/view/109783657).
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
4.11 Accessories for the ETU300 and ETU600 electronic trip units
CAUTION
CAUTION
disconnected from the auxiliary power supply
Accessories
347
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Troubleshooting
