FIELD: electricity.
SUBSTANCE: invention is referred to electric commutation switches, in particular to circuit breakers. The invention suggests commutation switch (600) having at least one single-pole tripping unit (10) comprised of movable bridge contact (22), a pair of fixed contacts (41, 51) functioning in combination with movable bridge contact and connected respectively to input current conductor (4, 5), and two arc-extinguishing chambers (24) opening in response to opened volume of the bridge contact (22) and containing a set of at least two deionising ribs (25) separated from each other by gas exchange space. Each arc-extinguishing chamber (24) is connected to at least one outlet channel (38, 42) for cooling gas, at that outlet channels are open to the panel from the side of body line (12) of the tripping unit (10), and the above panel from the side of body line is opposed to another panel from the load side and made so that it can be contacted by the tripping device (7).
EFFECT: provision of commutation switch with effective means to remove cooling gases.
15 cl, 10 dwg
