Masters Theses


"The steady state and short circuit performance of multi-link fuses is investigated, as it is affected by the magnetic field of the nearby returning current and the current flowing in the fuse itself. The fuses investigated are low voltage (600 volts or less), multi-link fuses with ratings between 400 and 4000 amperes. The effects of the above mentioned magnetic fields upon the steady state current distribution within the fuse and upon the mechanical forces acting on the individual fuse links are calculated, while the effects of close proximity of the returning current upon short circuit fuse performance are shown by experimental results.

Results of the steady state investigations reveal that only slight steady state unequal current distribution results from the magnetic field produced by the fuse's nearby returning current. Skin effect in a multi-link fuse, produced by the magnetic field generated by currents in the fuse, was also found to be very slight. In all steady state cases forces acting on the fuse links were calculated to be of very small magnitude.

Close proximity of returning current produced a slight asymmetry in the fuse's short circuit interruption, sometimes producing broken fuse links which did not sustain arcing. It was found that none of the magnetic field phenomena investigated hinder the proper performance of multi-link fuses"--Abstract, page ii.


McPherson, George, 1921-2017

Committee Member(s)

Morgan, J. Derald
Rivers, Jack L.


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


University of Missouri--Rolla

Publication Date



ix, 116 pages

Note about bibliography

Includes bibliographical references (page 91).


© 1970 John Thomas Schultz, All rights reserved.

Document Type

Thesis - Open Access

File Type




Library of Congress Subject Headings

Electric fuses
Magnetic fields
Skin effect (Electricity)

Thesis Number

T 2506

Print OCLC #


Electronic OCLC #



Print thesis not available at Missouri S&T Library.

Print thesis lost & withdrawn; scan made from microfilm is best quality availalble.