General
Eaton offers its Cooper Power™ series ELSP
current-limiting backup fuse that is used in series
with low current primary protection devices such
as a Bay-O-Net fuse or its Cooper Power series
MagneX™ interrupter.
The ELSP fuse is designed for use in transformer
oil, Envirotemp™ FR3™ fluid, or an approved
equivalent.
The fuse's highly efficient current-limiting section
minimizes the effects of high fault current
stresses on equipment and the distribution
system. Its minimum interrupting rating is
coordinated with that of a low current interrupter
to avoid undesirable low current operation; yet its
maximum interrupting rating will clear the highest
fault currents likely to occur. Higher continuous
current ratings can be achieved by connecting two
fuses in parallel.
Application
The ELSP fuse is used in transformers to protect
and isolate faulted equipment. When connected
in series with a low current primary protection
device, the fuse becomes an element of a twopart
protection system that gives a full range of
fault protection.
This two-part system provides low current
protection with the replaceable expulsion fuse
or resettable MagneX interrupter, and it adds the
energy-limiting protection of a current-limiting
fuse. Together, they coordinate easily with
upstream and downstream devices.