Eaton Corporation

Cutler-hammer, Inc.

James J Rusenko

Peter J Theisen

Frank Navratil, Jr

Loy A Hicks, Jr

Marian M Rzepecki

Stationary contacts (12) of a multi-pole disconnect or safety switch are arranged to be engaged by one of a rotatably movable bridging contact (2) before engagement of the other end thereof with a second set of stationary contacts (10). Stationary contacts (12) of adjacent switch poles are positioned on alternate ends for increasing the phase-to-phase failure distance, and one stationary contact (10a) may be arranged to close one or two milliseconds late to produce single phasing for a short time under fault current conditions during which time current limiting fuses (14) begin to open the circuit.

Contact sequencing arrangement for rotary double break switch

A spring jaw fuse clip (18) having a backup spring (22) encircling the fuse clip and bearing inwardly upon the outer surfaces of the legs (18b) of the fuse clip, the spring being attached to the fuse clip by engagement of portions (22d) thereof with horizontal (18e) notches in the edges of the fuse clip legs to prevent displacement of the spring with respect to the clip, and having a insulating fuse puller loop (20) disposed within a pair of slots (18c) open to the upper ends of the fuse clip legs for linear movement therein. A rib (20c) is provided on the fuse puller loop in the area between the fuse clip legs to prevent tilting or displacement of the fuse puller loop with respect to the fuse clip and to facilitate insertion of the fuse (8) blade therein by camming the legs (18b) outwardly to the width of the fuse blade upon being displaced to its outermost position in said clip. A portion (22b) of the backup spring ( 22) extends laterally along one leg of the fuse clip to span the open end of the slot (18c) in that leg, thereby to be engaged by the bight portion (20a) of the insulating fuse puller loop to limit outward movement of the loop with respect to the fuse clip assembly and thereby to retain the fuse puller integrally assembled therewith.

Spring jaw fuse clip and integrally retained fuse puller

A single-bolt joint having louvered contact strips interposed the bus bars and conductor splice plates for improved electrical connection under low insertion forces is tightened to become a solid connector assembly prior to attachment to the bus bars of a first bus duct and requires no additional tightening after insertion of the bus bars of the second bus duct. Expansion of the bus bars is accommodated at each joint without special apparatus.

Growing community of inventors

Milwaukee, WI, United States of America

James J Rusenko