A circuit breaker apparatus comprising: a housing ; a circuit disposed in the housing and configured to connect a power line to a load via one or more conductors and provide circuit protection for the one or more conductors and the load; a display attached to an outside surface of the housing; a controller ; a power control device electrically coupled to the display and the controller , and configured to provide power to the controller when the apparatus is being tampered with; and wherein the controller is configured to, when powered, cause the power control device to cause the display to change from a first state to a second state, wherein the first state indicates that the apparatus is authenticated and the second state indicates that the apparatus has been tampered with; and characterised in that the circuit breaker apparatus comprises a first RFID tag attached to the apparatus, the first RFID tag containing authentication data therein; wherein the controller is further configured to initialize the display to the first state by: retrieving the authentication data from the first RFID tag ; retrieving a key stored external to the apparatus; using the key to determine whether the authentication data retrieved from the first RFID tag is valid; and upon determining that the authentication data retrieved from the first RFID tag is valid, causing the power control device to initialize the display to the first state. a housing ; a circuit disposed in the housing and configured to connect a power line to a load via one or more conductors and provide circuit protection for the one or more conductors and the load; a display attached to an outside surface of the housing; a controller ; a power control device electrically coupled to the display and the controller , and configured to provide power to the controller when the apparatus is being tampered with; and wherein the controller is configured to, when powered, cause the power control device to cause the display to change from a first state to a second state, wherein the first state indicates that the apparatus is authenticated and the second state indicates that the apparatus has been tampered with; and characterised in that the circuit breaker apparatus comprises a first RFID tag attached to the apparatus, the first RFID tag containing authentication data therein; wherein the controller is further configured to initialize the display to the first state by: retrieving the authentication data from the first RFID tag ; retrieving a key stored external to the apparatus; using the key to determine whether the authentication data retrieved from the first RFID tag is valid; and upon determining that the authentication data retrieved from the first RFID tag is valid, causing the power control device to initialize the display to the first state. retrieving the authentication data from the first RFID tag ; retrieving a key stored external to the apparatus; using the key to determine whether the authentication data retrieved from the first RFID tag is valid; and upon determining that the authentication data retrieved from the first RFID tag is valid, causing the power control device to initialize the display to the first state. <EOS>