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WEG Molded Case Circuit Breakers - User’s Manual
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3. MANUAL OPERATION
Manual operation of the circuit breaker is controlled by the circuit breaker handle
and the PUSH-TO-TRIP button. The circuit breaker handle has three indicated
positions, two of which are shown on the cover with raised lettering to indicate
ON and OFF. On the sliding handle barrier, ON, OFF, and trip are also shown by
a color-coded strip for each circuit breaker handle position: red for ON, white for
tripped, and green for OFF. On the sliding handle barrier, ON/OFF is also shown
with the international symbols I/0 (see Figure 4.)
ON
OFF
Reset
Push-to-trip
button
Push-to-trip
Handle
International symbol
(OFF)
Handle position
Indicator color:
Red - ON
White - Trip
Green - OFF
Trip
Reset
Figure 4:
circuit breaker manual controls
3.1. CIRCUIT BREAKER RESET
After tripping, the circuit breaker is reset by moving the circuit breaker handle to
the extreme OFF position.
Note: in the event of a thermal trip, the circuit breaker cannot be reset until the thermal element cools.
3.2. PUSH-TO-TRIP BUTTON
The PUSH-TO-TRIP button checks the tripping function and is used to periodically
exercise the operating mechanism.
4. INSPECTION AND FIELD TESTING
UBW225 molded case circuit breakers are designed to provide years of almost
maintenance-free operation. The following procedure describes how to inspect
and test a circuit breaker in service.
