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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
Manual operation of the circuit breaker is controlled by the circuit breaker handle
and the PUSH-TO-TRIP but ton in the trip unit. 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 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 (see Figure 8).
Push-to-trip
Button
Thermal-magnetic
Trip unit adjustment
Button (3 places)
Handle position indicator
Color:
Red
White
Green
On
Trip
Off (reset)
-
-
-
- On
On
Trip
Off
(Reset)
- Off
International
Symbols
Figure 8:
circuit breaker manual controls
3.2. CIRCUIT BREAKER RESET
After an automatic or accessory initiated trip, or a manual PUSH-TO-TRIP
operation, the circuit breaker is reset by moving the circuit breaker handle to the
extreme OFF position.
NOTICE
In the event of a thermal trip in a thermal magnetic type trip unit, the circuit breaker
cannot be reset until the thermal element in the trip unit cools. A circuit breaker with
an electronic type trip unit can be reset immediately.
No circuit breaker should be reclosed until the cause of trip is known and the
situation rectified.
