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WEG Molded Case Circuit Breakers - User’s Manual 8
3. MANUAL OPERATION AND THERMAL-MAGNETIC
TRIP UNIT ADJUSTMENT
3.1. MANUAL OPERATION
The circuit breaker handle and the Push-To-Trip button in the trip unit control
manual operation of the circuit breaker. The circuit breaker handle has three
positions, two of which are shown on the cover with raised lettering to indicate ON
and OFF. On the handle, 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 (see Figure 6).
ON
ON
TRIP
OFF (reset) =
=
=
Handle
position
indicator
color:
ON international
OFF
OFF
TRIP
Push-to-trip
button
Red
White
Green
Figure 6: terminal installation
3.2. CIRCUIT BREAKER RESET
After a trip operation, moving the circuit breaker handle to the Reset (extreme OFF)
position resets the circuit breaker.
Note: in the event of a thermal (overload) trip the circuit breaker cannot be reset immediately. In a breaker with a
thermal-magnetic type trip unit the thermal element needs to cool (up to approximately five minutes) before
it can be reset.
No circuit breaker should be reclosed until the cause of trip is known and the
situation rectified.