ELECTRONIC CIRCUIT BREAKER HAVING TERMINAL CONNECTING BLOCK

PURPOSE: To provide a means to carry out communication between low voltage circuit breakers without affecting determination of overcurrent state by electrically connecting an electronic type trip unit with a terminal connector block through a cable. CONSTITUTION: A field programmable unit installed in an enclosure connects circuit breakers 17 mutually by using a terminal connector block 18 in which a plurality of terminal connectors 19 connected with electronic trip units in circuit breakers 17 in the enclosure through a multi-conductor cable 20 are arranged. Inquiry is continuously carried out to the interconnected circuit breakers 17 judges the states of the respectively set parameters and whether any one of circuit breakers responds as to shut a circuit current to the relevant part of an electric apparatus. With this constitution, without affecting the judgment of the over current state of the circuit breakers, low voltage circuit breakers can be communicated.