TOGGLE LEVER SWITCHING MECHANISM FOR AN AUTOMATIC SWITCHING APPARATUS INCLUDING W-VOLTAGE TRIPPING DEVICE

摘要

A toggle lever switching mechanism for an automatic switching apparatus including a housing and a low-voltage tripping device. The switching mechanism includes at least two toggle levers pivotally joined to each other at one end at a toggle joint and operatively connected to an actuating member for the switching mechanism by means of a spring member. The other ends of the toggle levers are pivotally coupled to a movable contact member of the switching apparatus and to a support lever which engages a latching pawl of the switching mechanism. The improvement of the invention comprises a support lever which is pivotally mounted tin the switching mechanism housing at one end thereof and is pivotally coupled to one of the toggle levers at a point intermediate the ends thereof. Stop means are disposed in the switching mechanism housing for engaging and limiting the movement of the support lever so as to prevent the support lever from engaging the latching pawl during initial movement of the actuating member from a contact-open position to a contact-closed position of the switching apparatus.