A flexible circuit board for a circuit breaker comprising: multiple circuit boards , which are hard circuit boards; and flexible connecting members , connected between the independent multiple circuit boards , such that the multiple circuit boards form a circuit board connected by the flexible connecting members , the flexible connecting members being bent such that the multiple circuit boards form a three-dimensional spatial layout, wherein a connection circuit is disposed on the flexible connecting members ; the connection circuit connects internal circuits of the multiple circuit boards ; the multiple circuit boards comprise: a control circuit board ; and a power supply circuit board ; an auxiliary function circuit board ; characterised in that the flexible connecting members comprise: a first flexible connecting member , two ends of the first flexible connecting member being connected to the control circuit board and the power supply circuit board respectively; a second flexible connecting member , two ends of the second flexible connecting member being connected to the control circuit board and the auxiliary function circuit board respectively; and the three-dimensional spatial layout comprises: the auxiliary function circuit board being disposed between the control circuit board and the power supply circuit board , and being arranged perpendicular to the control circuit board and the power supply circuit board , and the control circuit board and the power supply circuit board being disposed opposite and parallel to each other. multiple circuit boards , which are hard circuit boards; and flexible connecting members , connected between the independent multiple circuit boards , such that the multiple circuit boards form a circuit board connected by the flexible connecting members , the flexible connecting members being bent such that the multiple circuit boards form a three-dimensional spatial layout, wherein a connection circuit is disposed on the flexible connecting members ; the connection circuit connects internal circuits of the multiple circuit boards ; the multiple circuit boards comprise: a control circuit board ; and a power supply circuit board ; an auxiliary function circuit board ; characterised in that the flexible connecting members comprise: a first flexible connecting member , two ends of the first flexible connecting member being connected to the control circuit board and the power supply circuit board respectively; a second flexible connecting member , two ends of the second flexible connecting member being connected to the control circuit board and the auxiliary function circuit board respectively; and the three-dimensional spatial layout comprises: the auxiliary function circuit board being disposed between the control circuit board and the power supply circuit board , and being arranged perpendicular to the control circuit board and the power supply circuit board , and the control circuit board and the power supply circuit board being disposed opposite and parallel to each other. a control circuit board ; and a power supply circuit board ; an auxiliary function circuit board ; characterised in that the flexible connecting members comprise: a first flexible connecting member , two ends of the first flexible connecting member being connected to the control circuit board and the power supply circuit board respectively; a second flexible connecting member , two ends of the second flexible connecting member being connected to the control circuit board and the auxiliary function circuit board respectively; and the three-dimensional spatial layout comprises: the auxiliary function circuit board being disposed between the control circuit board and the power supply circuit board , and being arranged perpendicular to the control circuit board and the power supply circuit board , and the control circuit board and the power supply circuit board being disposed opposite and parallel to each other. <EOS>