Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1995-11-14
1997-11-25
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 93, 364483, H02H 300
Patent
active
056918712
ABSTRACT:
A motor starter for an electrical circuit including a power source and a load, includes an electrical contactor having separable contacts for switching an electrical current flowing between the power source and the load, and an operating mechanism responsive to a trip signal for opening and closing the separable contacts; a current sensor for sensing the electrical current flowing between the power source and the load and providing a sensed current value therefrom; and an overload relay including a microcomputer routine for generating the trip signal as a function of a trip current value and at least one of: (a) a test current value, and (b) the sensed current value; and a test routine including at least one of: (a) a first selecting mechanism including a routine for selecting a first predetermined value as the trip current value and a routine for selecting the test current value for use by the microcomputer routine with the trip current value, and (b) a second selecting mechanism for selecting one of at least one second predetermined value, which is different from the first predetermined value, as the trip current value for use by the microcomputer routine with the sensed current value.
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Eaton Corporation
Gaffin Jeffrey A.
Sherry Michael J.
Vande Zande Larry G.
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