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PX 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 the circuit breaker switches off power, the front panel display shows:
CbE, which means "circuit breaker error."You are still able to switch between outlets on the PDU's display panel when the circuit breaker error occurs. Outlets affected by the error show CbE. Unaffected outlets can show diverse sensor readings properly.
When a circuit 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.