FIELD: electrical engineering.
SUBSTANCE: invention relates to a casing made from electric insulating material (1) with a fastening section (2) meant for installation of an arc-extinguishing chamber, where the fastening section has an inlet connecting piece (5), and an actuating section (3), which adjoins the fastening section lengthwise, where the actuating section has an actuating hole for moving the actuator into the arc-extinguishing chamber, and has an outlet connecting piece (8). In the casing there is ventilation shaft (12), which surrounds the fastening section (2) in form of a collar, where the ventilation shaft is linked to the inside of the actuating section (3).
EFFECT: high cooling power, also sufficient for large currents.
11 cl, 3 dwg
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