Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1991-10-28
1993-09-21
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361102, 361152, 361187, H02H 308
Patent
active
052474194
ABSTRACT:
A low voltage switchgear with a single or multipole contact arrangement (1) with a corresponding number of fixed contacts (2) and movable contacts (3), a magnet armature (4) that moves the movable contacts (3), at least one magnet coil (5) that is energized by direct current and a setpoint switch release (9). The magnet armature (4) operates in a bistable way and is kept in the respectively reached switching position The switchgear is universally usable and becomes reliable by providing an overcurrent protective circuit (13) that energizes the magnet coil (5) after a predetermined time delay by direct current in the conduction direction necessary to reach the switching-off position of magnet armature (4) when an overcurrent that lies below a threshold overcurrent appears at least at one connected pole (12), and when a current that reaches or exceeds a threshold overcurrent appears at least at one connected pole (12), the magnet coil (5) is energized with direct current in the conduction direction necessary to reach the switching-off position of magnet armature (4) as rapidly as possible.
REFERENCES:
patent: 4914541 (1990-04-01), Tripodi et al.
patent: 4967309 (1990-10-01), Hoffman
patent: 5105326 (1992-04-01), Shimp et al.
Heinz Greif, Moderne Relais und ihre Schaltungen, Jun. 24, 1987, pp. 99-100.
Hans Sauer, Relais-Lexikon, 1985, p. 137.
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