Eaton EFX48 e-Fuse Series, Installation And Operation Manual

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EFX48 e-Fuse System Operation
Copyright © 2019 Eaton Corporation. All Rights Reserved.
IPN March 2019
93
There are two types of string trips :
♦
A string may trip due to the breaker curve function; these are generally longer term over
current conditions and are referred to as ‘Breaker Trips’. The time taken to trip the string
is related to the magnitude of over current and the current rating of the string. The time
taken to trip under any overload condition can be determined from the breaker curve on
page 117.
♦ A string may trip due to a very sudden high current such as that presented by a short
circuit; these are referred to as ‘Fast Trips’. The fast trip operates at a fixed current and is
not configurable. See the Specification section on page 138 for more details.
Breaker Curve Function
String current is continuously monitored and if it exceeds 130% of the configured rating then
the breaker curve algorithm is applied as defined on page 117. Note that the breaker curve
operates in both charge and discharge directions.