Electrical apparatus for differential current protection

Details Electrical apparatus for differential current protection Electrical apparatus for differential current protection

1991-10-21

1994-05-03

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 87, 361 44, H02H 300

Patent

active

053093119

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: 4429340 (1984-01-01), Howell
patent: 4713604 (1987-12-01), Becker et al.

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