US Patent 9711954 Snap-in shutter system for rack out circuit breakers

The present disclosure provides a shutter system (150) for a cradle (100) of a rack out circuit breaker, which includes two rail assemblies (200, 300), a shutter (400) and a cam actuator (280). A first of the rail assemblies is configured to snap into an interior surface of one of the side walls (102, 104) of a cradle, and a second of the rail assemblies is configured to snap into an interi- or surface of an opposing side wall of the cradle. Each rail assembly includes a snap-in lock assembly and a slider movable between a front and back of the cradle along a corresponding side wall.