Overload relay having accurate trip current dial markings

Details Overload relay having accurate trip current dial markings Overload relay having accurate trip current dial markings

1997-09-26

1999-09-21

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, 361115, 335 18, H02H 300

Patent

active

059562218

ABSTRACT:
Problems with inaccuracies in selecting the relay trip current in an overload relay are eliminated in an overload relay employing a custom potentiometer having a resistance that varies at multiple rates to set the trip current value. The dial markings on the trip current adjustment dial are sufficiently spaced to allow for a more precise selection of the relay trip current at the higher ampere settings of the relay.

REFERENCES:
patent: 4833564 (1989-05-01), Pardue et al.
patent: 5517165 (1996-05-01), Cook

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