A pyrotechnic circuit breaker includes a housing with at least one cutting chamber, at least one electrical conductor, at least one punch designed to section the at least one electrical conductor, at least one pyrotechnical actuator, and an insert moulded on the at least one electrical conductor. The housing includes a first housing part and a second housing part with at least one sealing means between the insert and one of the first housing part and/or of the second housing part in order to ensure a seal of this at least one cutting chamber.