Frederick M Fuller

US Patent:

40902307, May 16, 1978

Filed:

Feb 10, 1977

Appl. No.:

5/767278

Inventors:

Frederick B. Fuller - Columbia SC
Miklos J. Orosz - Columbia SC
Richard H. Williams - Columbia SC
Glen F. Diimmler - Irmo SC

Assignee:

Square D Company - Park Ridge IL

International Classification:

H02B 114

US Classification:

361345

Abstract:

A high voltage motor starter enclosure includes a floor mounted vertical section consisting of three starter cells, stacked one on top of the other, each cell being suitable to mount one full voltage, non-reversing, squirrel cage starter having a contactor of the air break type. Each starter cell consists of four distinct, isolated compartments: a line and vertical bus compartment containing space for incoming line cables and vertical bus; a load compartment containing space for starter current transformers and motor cables for individual starters; a low voltage control compartment having a drawout, swing-open compartment door (panel) to provide easy access to meters, relays, pilot devices and terminal blocks for inspection and maintenance thereof; and a high voltage contactor compartment containing mechanical and electrical interlocks to minimize electrical hazards, a hinged door to provide easy access to a contactor and related component parts, and to the line and vertical bus, and load compartments by removing barrier cover plates. Wheel assemblies are mounted on each contactor so that the contactor rolls into both fully engaged and disengaged positions upon a contactor rail assembly which is part of a removable tray positioned beneath the contactor to support the same. The removable tray further includes several mechanical interlocks, a shutter operator mechanism for operating a shutter plate assembly to isolate the line and load terminals from the contactor, a positive ground connection assembly so that the contactor is grounded in the engaged and disengaged positions, a contactor stop assembly, and a bottom barrier plate for isolating the high voltage contactor compartments of each cell from one another.