June 2018
Legrand PDU User Guide 77
Circuit Breakers
Legrand PDU models rated over 20A (North American) or 16A (international) contain overcurrent protectors
for outlets, which are usually branch circuit breakers. These circuit breakers automatically trip (disconnect
power) when the current flowing through the circuit breaker exceeds its rating.
If a circuit breaker switches off power, the LCD display shows open. To find which circuit breaker is open
(trips), select Alerts or OCPs in the Main Menu. See Operating the Dot-Matrix LCD Display (on page 59).
Whe
n a ci
rcuit breaker trips, power flow ceases to all outlets connected to it. You must manually reset the
circuit breaker so that affected outlets can resume normal operation.
Depending on the model you purchased, the circuit breaker may use a button- or handle-reset mechanism.
Resetting the Button-Type Circuit Breaker
Your button-type circuit breakers may look slightly different from the images shown in this section, but the
reset procedure remains the same.
To reset the button-type breakers:
1. Locate the breaker whose ON button is up, indicating that the breaker has tripped.
2. Examine your Legrand PDU and the connected equipment to remove or resolve the cause that results in
the overload or short circuit. This step is required, or you cannot proceed with the next step.
3. Press the ON button until it is completely down.
Resetting the Handle-Type Circuit Breaker
Your handle-type circuit breakers may look slightly different from the images shown in this section, but the
reset procedure remains the same.
To reset the handle-type breakers:
1. Lift the hinged cover over the breaker.
2. Check if the colorful rectangle or triangle below the operating handle is GREEN, indicating that the
breaker has tripped.
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