Electrical apparatus for magnetothermal and differential protect

Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection

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Details

361 86, 361 91, 361152, 361160, 340662, H02H 316

Patent

active

048519502

ABSTRACT:
An electrical apparatus for magnetothermal and differential protection, of the type comprising a device for sensing differential currents associated with a magnetothermal protection switch, comprises a differential current sensor connected to an input of a controlled gain signal amplifier, in turn connected to a plurality of light indicators arranged to go on progressively in dependence on the sensor. The apparatus provides a quantitative and qualitative measurement of the stray current.

REFERENCES:
patent: 4037155 (1977-07-01), Ahmed
patent: 4223365 (1980-09-01), Moran
patent: 4714975 (1987-12-01), Dvorak

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