The invention relates to a circuit breaker device comprising a bottom switch part (2) that can be brought into electrical contact with bus bars, a top switch part (1) which can be placed onto the bottom switch part (2) and is provided with at least one fuse link, switch module, contactor or similar, and a terminal module (3) for especially at least one outgoing feeder (42). The bottom switch part (2) is provided with contact elements (5, 6, 7) that are in electrical contact with the bus bars (9, 10, 11) and can be contacted in a contact-proof manner by means of plug-in contacts (17, 18, 19) of the top switch part (1) via one respective access slot (12, 13, 14) located in a top area of the bottom switch part (2). The terminal module (3) is pivotally mounted (50) on the side of the top switch part (1) of bottom switch part (2) and is provided with electrical contacts (38, 39, 40) that can be laterally inserted into the top switch part (1) and are allocated to each outgoing feeder (42).