Henry O Jeffries

US Patent:

RE311472, Feb 8, 1983

Filed:

Jul 31, 1981

Appl. No.:

6/289078

Inventors:

William F. Helwig - Downers Grove IL
Henry D. Jeffries - Naperville IL

Assignee:

Avtec Industries, Inc. - Downers Grove IL

International Classification:

H02H 316

US Classification:

361 42

Abstract:

A ground fault and fire detector system for an A. C. electrical power distribution apparatus including a multi-pole circuit interrupter to disconnect a poly-phase electrical power supply from a load. A single-pole circuit device is operatively connected to the circuit interrupter for controlling its operation. Ground fault sensing circuitry is operatively positioned with respect to at least one wire for initiating a fault current. The single-pole circuit device is responsive to the fault current for activating the circuit interrupter to disconnect the power supply from the load.