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WEG Molded Case Circuit Breakers - User’s Manual
9
Push-to-trip
button
Handle position indicator color
Red
ON
ON
ON
-
White
TRIP
TRIP
TRIP
International
symbols
Thermal-magnetic
Trip Unit Adjustment
Button (3 places)
-
Green
OFF (reset)
OFF
(reset)
-
Figure 7:
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.
No circuit breaker should be reclosed until the cause of trip is known and the situation
rectified.
3.3. PUSH-TO-TRIP BUTTON
The PUSH-TO-TRIP button checks the circuit breaker tripping function and is
used to periodically exercise the operating mechanism in thermal-magnetic trip
units. The button is designed to be operated by a small screwdriver.
3.4. THERMAL-MAGNETIC TRIP UNIT ADJUSTMENT
The magnetic element of each pole of the trip unit can be adjusted by rotating the
adjustment buttons on the front face of the trip unit with a screwdriver. The buttons
have several settings, as indicated on the nameplate, with values in multiples of
the trip unit ampere rating (In) (see Figure 8) To adjust the setting, rotate each but
ton clockwise until arrow on button points to desired setting.