Abstract: An office panel partition includes a panel frame having at least two uprights and a horizontal structural member rigidly interconnecting the uprights. The panel frame has a first side and a second opposite side, and the panel frame defines at least four apertures on the first side thereof. The partition also includes a cover member having a major planar surface defining an exterior surface of the partition. The cover member includes at least four projections that are removably insertable into the at least four apertures to removably secure the cover member to the frame. The apertures are arranged in at least two vertically spaced horizontal rows and at least two horizontally spaced vertical columns. The apertures in a first one of the columns have different horizontal dimensions than those of the apertures located in the other of the columns. Each of the projections has a range of lateral positions when inserted into a respective one of the apertures.

Abstract: A molded insulator has a bottom wall, opposed sidewalls, and a transverse end wall extending between the sidewalls but spaced from the end of the bottom wall to define an opening in the bottom. A distribution lug is inserted from an open end of the insulator against the end wall, and under projections on inner surfaces of the sidewalls to trap the insulator against the end wall, and under projections on inner surfaces of the sidewalls to trap the insulator against up and down movement. The lug is attached to a circuit breaker terminal at the opening in the bottom to trap the end wall between the lug and the circuit breaker, blocking withdrawal of the insulator. A depending rib provides distal end support, while lateral ribs abut edges of barriers in the breaker housing to maintain the assembly properly aligned for electrical spacing.

Abstract: Rejection of a twin circuit breaker at panelboard mounting positions not designated to receive a twin breaker is achieved by extending the hook of the twin breaker outwardly beyond the panelboard rail to prevent anchoring the outboard end of the twin breaker at non-designated positions, thereby indicating obviously improper installation. The rail is provided with outward extensions at designated mounting positions which do engage with the twin breaker hook to anchor the outboard end, such extension in a preferred embodiment being part of an adapter attached to the panelboard.

Abstract: A twin unit circuit breaker has a V-shaped stainless steel combination armature pivot and bias spring, a central offset portion on the armature to increase the armature surface area that is substantially uniformly spaced to pole faces of a pole piece, a thin profile connection of an operating spring with a latch lever, and a preformed U-shaped conductor attachable in circuit between a bimetal and a flexible conductor and insertable over a pole piece from one end thereof.

Abstract: A flat plastic retainer having a loop at one end rotatably receiving a threaded fastener and a tongue and outboard fingers unidirectionally extending from the loop to engage an essentially upright leg of a terminal of a circuit breaker, has lateral projections on the tongue which are compressed when the tongue is inserted through an opening in the leg of the terminal and expand when the projections pass beyond the opposite side of the terminal to resist pull-out of the retainer from the terminal. The outboard fingers are deflected along the terminal to bias the fastener into engagement with an associated leg of the terminal having an opening through which one portion of a threaded fastener pair projects to engage the other portion.