Patent ID: 7492563

Claim:
A low voltage circuit breaker ( 1 ) comprising: a casing containing at least one fixed contact and at least one mobile contact, wherein said circuit breaker comprises, inside said casing, a first communication bus ( 5 ) designed to interface a plurality of accessory and devices ( 20 , 30 , 40 , 50 ) of said circuit breaker ( 1 ), one of said devices and accessories being a protection unit ( 50 ), and an interface unit ( 10 ) comprising a plurality of ports ( 11 , 12 , 13 , 14 , 15 ) designed to be connected to said accessory and devices ( 20 , 30 , 40 , 50 ) via said first communication bus ( 5 ), wherein said protection unit ( 50 ) is connected, via a second communication bus ( 6 ) to a supervision unit ( 2 ) outside the casing of said circuit breaker, wherein a first communication protocol is for said first communication bus ( 5 ), said first communication protocol being dedicated to the communication between the accessories and devices inside the circuit breaker, and wherein a second communication protocol is used for said second communication bus ( 6 ), said second protocol being dedicated to the communication between the circuit breaker and said supervision unit, and wherein said interface unit ( 10 ) is configured in such a way that each of said ports ( 11 , 12 , 13 , 14 , 15 ) can be used indifferently and in an interchangeable way by any one of said accessories and devices ( 20 , 30 , 40 , 50 ).