GE Industrial Solutions ProTrip Trip Units for Low-Voltage - Manual (Page 15)

ProTrip™ Trip Units
Chapter 4. Maintenance and Trouble-Shooting
9
4–1 Trip Unit Removal and Replacement
Rejection pins are installed on the rear of all Trip Units to
prevent installation of an incorrect Trip Unit into a
breaker. Do not use excessive force when installing a Trip
Unit.
To install the Trip Unit, perform the following procedure:
1. Unscrew the brass knob in the center of the rear of
the trip unit. Lineup the mounting bracket to engage
the rejection posts. Screw the brass knob through the
bracket and into the trip unit.
2. Plug the wiring harness into the trip unit and screw it
to the bracket.
3. Attach the mounting bracket to the adapter plate,
previously installed on the breaker.
4–2 Rating Plug Removal and Replacement
CAUTION: Removal of the rating plug while the breaker
is carrying current reduces the breaker’s current-carrying
capacity to approximately 25% of the current sensor
rating.
ATTENTION: Si le calibreur est retiré le disjoncteur et
traversé par un courant, le niveau de protection s’ajuste à
approximativement 25% du calibre du transformateur
d’intensité.
Interchangeable rating plugs are removed with a rating
plug removal tool, Catalog No. TRTOOL. (Suitable
equivalents are commercially available as “integrated
circuit (DIP) extractors.”) Grasp the rating plug tabs with
the extractor and pull the plug out as illustrated in Figure
13. Be sure to grab the tabs and not the front cover of the
rating plug, or the plug may be damaged.
To install a rating plug, hold the plug between the thumb
and forefinger, then push it into the Trip Unit. Proper
engagement is verified by a click. Rejection features are
provided on all rating plugs to prevent application
mismatches. Never force a rating plug into place. Refer to
Chapter 1 to find the appropriate rating plugs for each
sensor rating and breaker frame.
Do not attempt to use a rating plug from a different type
of Trip Unit in a ProTrip Trip Unit.
Figure 13. Removing the interchangeable rating plug.
4–3 Target Module Removal and Replacement
The target module is removed with the rating plug
removal tool, catalog number TRTOOL, also known as an
integrated circuit (DIP) extractor. Grasp the tabs of the
module with the tool, as shown in Figure 14. Be careful to
hold the tabs and not the front cover, as the Target
Module could be damaged otherwise. Gently pull the
Target Module away from the Trip Unit. A gentle left-
right motion assists the removal. Insure that the tabs are
held securely until the Target Module is completely
removed.
To install a target module, hold the module between the
thumb and forefinger, then push it into the Trip Unit.
Proper engagement is verified by a click.