Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1989-12-27
1992-12-08
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 79, 361 87, H02H 308
Patent
active
051703114
ABSTRACT:
An overcurrent protection device is provided for one or more phases of a circuit that generates a control signal dependent upon an adjustable trip level setting after a fault has occurred. The device includes a blocking level detector that blocks the generation of the control signal is the current in any of the phases exceeds either a first predetermined blocking level or the adjustable trip level setting. In a preferred arrangement, before control-signal generation, the device also requires that the current in at least one phase is below a predetermined load level.
REFERENCES:
patent: 4445183 (1984-04-01), McCollum et al.
Mugalian Brian P.
Zulaski John A.
Deboer Todd E.
Lapacek James V.
S&C Electric Company
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