8 Testing the trip unit and the circuit breaker
PXR Electronic trip unit
01/21 MN012005EN
www.eaton.com
47
8 Testing the trip unit and the circuit breaker
Testing should be carried out prior to commissioning if the circuit breaker is
located in a de-energized system or in a system with withdrawable or plug-in
mechanism, and is in the TEST POSITION, DISCONNECTED or
WITHDRAWN.
￫
Since the time-current settings form the basis for the desired
system coordination and protection schemes, the protection
settings, if altered during a test sequence, must be reset to their
as-found conditions.
WARNING
Do not attempt to install, test, or perform maintenance on the
equipment while it is energized.
Direct contact with live parts may result in immediate death or
serious injury.
De-energize the circuit and disconnect the circuit breaker before
performing any maintenance work or testing. Follow the five
safety rules!
CAUTION
Once the device has tripped, the power supply will be
interrupted, which may result in unnecessary switching
operations of subordinate devices. Testing may be carried out
even if the circuit breaker is energized and in service.
Testing that will result in the tripping of the circuit breaker
should only be carried out with the circuit breaker in the test or
disconnected positions or while the circuit breaker is on a test
bench. The system will prevent a test if more than 5 % of the
rated current I
n
is detected.
A password is required to prevent any unauthorized access that
may cause the circuit breaker to trip.
￫
Password:
The default password is 0000.
This can be changed in the device settings.
