Switch contact arcing control for power switching device - combines movement of contacts carrier with overload device having isolator inserted to limit arcing.

摘要

A power switching device has one contact (33) on a fixed carrier and another (23) on a movable carrier (22). In this condition the current flow normally. If a short circuit condition occurs the movable element moves along an arc about a pivot point (A) and the contacts separate. At the same time a curved isolating wall (5) is inserted between the contact carriers and the arcing length is reduced to extinguish the arc. When an overload occurs the pin (41) of trigger stage (4) responds to cause the unit to respond and causes contact opening. ADVANTAGE - EM force simultaneously opens contacts and moves separating wall.