Excess current switching device
AssigneeEllenberger & Poensgen GmbH
InventorJakob Ellenberger
Life of this patent
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Abstract
An excess current switching device having particular but not exclusive application in switching direct current power. The switching device comprises first and second excess current switches. The first switch comprises a break point and a thermal and/or electromagnetic tripping device(s) linked to a latching mechanism and the second switch comprises a break point and an electromagnetic tripping device having a high resistance coil linked to a latching mechanism. The break point of the first switch is connected in parallel with the tripping device of the second switch. When an excess current occurs, the break point of the first switch opens, leaving the tripping device of the second switch in curcuit and this opens the break point of the second switch.
Claims7
An excess current switching device comprising, in combination:
- a. a first excess current switch having
- i. a first break point, and
- ii. at least one tripping device effective to trip said first break point on the occurrence of an excess current,
- b. a second excess current switch having
- i. a second break point, and
- ii. an electromagnetic tripping device effective to trip said second break point on the occurrence of an excess current, said electromagnetic tripping device having a coil of high ohmic design, said electromagnetic tripping device being coupled in parallel with said first break point, whereby when said first break point is tripped, excess current flows through said electromagnetic tripping device to trip sequentially said second break point.
Dependencies are inferred from the claim text.