FIELD: electricity.
SUBSTANCE: application: in the field of electrical engineering. A protective circuit breaker (11) comprises opening contacts for set disconnection of a grid, which are controlled by at least one start unit (10), to reduce risk of fire due to faults in electric networks. Additionally the protective circuit breaker comprises a detector (1) to detect aperiodic, substantially spasmodic variations of amplitude of at least one electric parameter in the electric network. The start unit (10) is functionally connected to the detector (1).
EFFECT: reliability improvement.
16 cl, 20 dwg
