Offset, series connected current limiting fuse and expulsion fus

Details Offset, series connected current limiting fuse and expulsion fus Offset, series connected current limiting fuse and expulsion fus

1977-11-25

1980-01-15

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337144, 337169, H01H 7110, H01H 7120

Patent

active

041841387

ABSTRACT:
A combination dropout assembly adapted for use with protective cutouts in an electrical distribution system comprises a current limiting fuse electrically connected in series with an explusion-type fuse, and mechanically coupled in skewed relation to the latter, whereby the assembly provides reliable full range fault current protection yet is sufficiently compact in length to matingly span the gate between conductive terminals of conventional 15 KV class opengate cutouts found in many existing electrical distributioon systems. Overload and low to medium fault current protection is provided by the expulsion fuse, while high range fault currents are cleared by operation of the current limiting fuse. The oblique arrangement of the fuses relative to one another permits venting from either end of the expulsion fuse without directing potentially detrimental gases toward the current limiting fuse, and further allows the combination of various sizes of current limiting fuses and explusion fuses in the make-up of the dropout assembly such that protection characteristics of the latter may be tailored to preserve coordination of a particular distribution system.

REFERENCES:
patent: 2716681 (1955-08-01), S. R. Smith, Jr.
patent: 3827010 (1974-07-01), Cameron et al.

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