FIELD: electric engineering. SUBSTANCE: each pole of automatic switch has stationary contacts 4, moving bridge contact 5, arc-quenching chambers 6, lock 7, thermal clad metal unlock 8. Stationary contact 4 has current supply 9, which one end has insulating space near loose end of stationary contact 4 and serves as arc-quenching arm 11, another end of current supply 9 is connected to terminal 14. EFFECT: increased protection. 2 dwg
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