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10. Maintenance of the PT Trip Unit
10.2 Replacing the Trip Unit
The PT unit is designed as a field replaceable unit.
•
Remove the circuit breaker front cover.
•
Remove the trip unit harness from the top of the trip
unit.
•
Loosen the top and bottom screws using a screwdriver.
Note that the bottom screw is located on the left side of
the USB port and is covered by a door.
•
Pull the trip unit's control module outward for removal.
Figure 16. Location of the Top and Bottom Trip Unit
Screws
Guide grooves
24
PT UNIT USER MANUAL APRIL 2023 www.eaton.com.cn
Screws
To install a new trip unit:
•
First, connect the wiring harness at the top of the trip
unit's control module (such harness is not available for
certain trip unit styles).
•
Align the trip unit's control module with the guide
grooves of the frame module and press it down.
•
Connect the control module tightly to the frame module
of the trip unit, until the trip unit seats firmly in the
housing.
•
Secure the trip unit with the mounting screws using a
screwdriver, with the maximum screw torque of 1.0N· M
(8.9 lbf/in.).
•
Replace the circuit breaker front cover.
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