Page 20 | OPERATION |
MANUAL CLOSING (Manual
1.Check to make sure that the
2.Turn the closing handle clockwise. The breaker will close
NOTE If the handle is turned in small increments, the closing spring will store the energy from the handle action and the circuit breaker will close before 75° of rotation.
3.Release the handle, and it will return to its initial position.
MANUAL OPENING (All Types):
1.Push the trip lever in the direction of the arrow (Fig. 25).
2.The
ELECTRICAL OPERATION
The flow chart shown in Fig. 27 illustrates the sequence of electrical operation of the MU and ML type circuit breakers.
Refer to Fig. 26 and the circuit breaker schematics shown in Fig. 28 through Fig. 31 for determining external control circuit connections to the circuit breaker.
Fig. 25 Manually Opening Breaker
SYMBOL | DESCRIPTION |
|
|
M | Motor |
TC | Voltage Trip Coil |
UV | Undervoltage Trip Coil |
a1 to a6 | Auxiliary Contacts (N.O.) |
b1 to b6 | Auxiliary Contacts (N.C.) |
X | Control Relay |
Control Relay Contact (N.O.) | |
Control Relay Contact (N.C.) | |
Y | Auxiliary Relay |
Auxiliary Relay Contact (N.O.) | |
Auxiliary Relay Contact (N.C.) | |
LS1 to LS3 | Limit Switches |
R1 to R4 | Resistors |
REC | Rectifier |
D | Diode |
C | Capacitor |
SP | Surge Protector |
RL | Red Lamp |
GL | Green Lamp |
Fig. 26 Legend for Schematics