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WEG Molded Case Circuit Breakers - User’s Manual
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2. INSTALLATION
The installation procedure consists of inspecting the circuit breaker and, as
applicable, installing the trip unit, accessories, interphase barriers and terminals;
mounting the circuit breaker; connecting the line and load conductors; torquing
terminals and attaching terminal shields. Circuit breaker frames, trip units,
accessories, mounting hardware, and unmounted terminals may be supplied in
separate packages. To install the circuit breaker, perform the following steps.
NOTICE
UBW250 circuit breakers are factory sealed for reverse feed applications under
UL 489. UL requires that internal accessories be installed at the factory in this type of
circuit breaker.
For hardware conversion kits and handle mechanisms required to replace existing
WEG circuit breakers.
If required, internal accessory installation in any type of circuit breaker should be
done before the circuit breaker is mounted and connected. Refer to individual
accessory instruction leaflets.
Circuit breaker mounting hardware is supplied separately.
1. Make sure that the circuit breaker frame is suitable for the intended installation
by comparing nameplate data with existing ratings and system requirements.
Inspect the circuit breaker for completeness, and check for damage before
mounting. Uninstalled cover mounting hardware is supplied in a plastic bag with
the circuit breaker frame (see Figure 2).
Thread-forming screws
Pan head screws
Figure 2:
cover mounting hardware
