Main Circuit Breaker - Generac Power Systems MAGNUM MMG25IF4 Operating Manual

120V GFCI
Receptacles
125/250V
Twist-Lock
Receptacles
Power to the receptacles is available any time the generator is running, EVEN IF THE MAIN
CIRCUIT BREAKER IS OFF (O). VERIFY EQUIPMENT CONNECTED TO THE RECEP-
TACLES IS TURNED OFF BEFORE TURNING THE BREAKERS ON. Verify the voltage
selector switch is in the proper position and that the output voltage is correct for the equipment
that is connected to the receptacles. Improper voltage may cause equipment damage or
Note: When the voltage selector switch is in position for 480/277V 3Ø, voltage at the two GFCI receptacles is 139
volts and the voltage at the three twist-lock receptacles is 240/139 volts. Generac Mobile Products does not
recommend using the receptacles in the 480V position. When the voltage selector switch is in position for 208/120V
3Ø, voltage at the three twist-lock receptacles and the two GFCI receptacles is 208/120 volts.

MAIN CIRCUIT BREAKER

The main circuit breaker is located on the main control panel. When the breaker is
OFF (O), power is interrupted between the connection lugs, the optional cam lock
receptacles, and the generator. Once the connections have been made to the
connection lugs or the optional cam lock receptacles, and the unit has been started
and allowed to reach normal operating temperature, the breaker may be switched ON
(I).
The main circuit breaker will be tripped, disconnecting power to the connection lugs
and the optional cam lock receptacles if any of the following items occur while the unit
is running:
36949 B
50A Circuit 20A Circuit
Breakers Breakers
Figure 3-7. Receptacle and Breaker Locations
malfunction.
MMG25I-35D-45I-55DF4 Operating Manual
Operation
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00489
Figure 3-8. Main Breaker
29