Circuit breaker panelboard with discriminating means

Claim 1

AN ELECTRIC CONTROL DEVICE PANELBOARD COMPRISING: (A) A SUPPORT HAVING A GENERALLY PLANAR SUPPORTING PORTION, (B) AN APERTURE IN SAID SUPPORTING PORTION, (C) A RETAINING HOOK CARRIED BY SAID SUPPORTING PORTION AND INCLUDING A FIRST PORTION EXTENDING SUBSTANTIALLY PERPENDICULAR TO THE PLANE OF SAID SUPPORTING PORTION AND A SECOND PORTION EXTENDING SUBSTANTIALLY PARALLEL TO THE SAID PLANE OF SAID SUPPORTING PORTION, SAID HORIZONTALLY EXTENDING PORTION OF SAID RETAINING BOOK EXTENDING OVER SAID APERTURE, (D) MEANS CLOSING SAID APERTURE AT THE UNDER SURFACE OF SAID SURFACE PORTION, (E) AN ELECTRIC CONTROL DEVICE COMPRISING AN INSULATING CASING INCLUDING A SHELF PORTION RECEIVABLE UNDER SAID RETAINING HOOK, (F) A BLOCKING PORTION UNDER SAID RETAINING HOOK SUPPORTED ON SAID MEANS CLOSING SAID APERTURE, (G) SAID BLOCKING PORTION EXTENDING SUBSTANTIALLY PERPENDICULAR TO THE PLANE OF SAID GENERALLY PLANAR SUPPORTING PORTION AND PROJECTING TOWARD THE SECOND PORTION OF SAID RETAINING HOOK TO BLOCK THE OPENING THEREOF, (H) SAID CONTROL DEVICE SHELF PORTION HAVING A SLOT CUT THEREIN AT A POSITION CORRESPONDING TO THE POSITION OF SAID BLOCKING PORTION.