APC G50B-20A2 Manuel D’Utilisation

There is no input power, or insufficient input power 
from the wall outlet.

Use a voltmeter to check the output of the wall outlet. Use a 
device that is known to work properly to check the outlet.

Note: The unit will not turn on if the input utility power is out 
of the acceptable range.

A circuit breaker has been tripped.

Check the building circuit breakers and the unit’s circuit 
breaker. If the circuit breaker on the unit has been tripped, the 
center post will protrude from the unit. To reset the breaker, 
push the center post into the unit. If it trips again, unplug one of 
the components plugged into the unit and reset the breaker.

The unit is rated for 15 Amps, however, the National Electric 
Code (NEC) dictates that any home circuit should not be 
loaded to more than 80% of its rating.

Note: If the breaker is tripped again after trying this solution, 
contact APC Technical Support.

Power is not supplied to some outlets.

Power to the 

C

ONTROLLED

 outlets has intentionally been 

turned off.

The 

C

ONTROLLED

 outlets are not supplying power, 

even though the master device is not in sleep mode.

The 

M

ASTER

 Outlet threshold may be incorrectly set.

The unit is overloaded. The overload LED is flashing. The Overload LED on the front of the unit will illuminate red if 

the unit is overloaded. Reduce the load by disconnecting one or 
more components from the back of the unit. When the load is 
below 95%, the LED will stop flashing.

• The wall outlet polarity is reversed.
• The neutral wire is overloaded.
• The earth ground is not connected at the wall outlet.

Contact an electrician to inspect the building wiring.

WARNING: Do not operate the unit if any of these conditions 
exist. The unit may not be providing surge protection.

The unit is on, but none of the LEDs are illuminated. Push 

U

P

 or

 D

OWN

 several times. The LEDs should illuminate. 

If they do not illuminate, contact APC Technical Support.