IEEE Standard Design Tests for

High-Voltage (>1000 V) Fuses

and Accessories

IEEE Power and Energy Society

Sponsored by the
Switchgear Committee

IEEE
3 Park Avenue IEEE Std C37.41™-2016/Cor 1-2017
New York, NY 10016-5997 (Corrigenda to
USA IEEE Std C37.41-2016)

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 IEEE Std C37.41™-2016/Cor 1-2017
(Corrigenda to
IEEE Std C37.41-2016)

IEEE Standard Design Tests for

High-Voltage (>1000 V) Fuses
and Accessories

Corrigenda 1

Sponsor

Switchgear Committee
of the
IEEE Power and Energy Society

Approved 6 December 2017

IEEE-SA Standards Board

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

Abstract: Corrigenda concerning required procedures for performing design tests for high-
voltage fuses are specified. These design tests, are appropriate to expulsion fuses, and cover
interrupting tests and fuses using polymeric insulators.

Keywords: fuse accessories, fuse design tests, fuse disconnecting switches, fuse-enclosure
package (FEP), high-voltage fuses, IEEE 37.41™
•

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PDF: ISBN 978-1-5044-4604-4 STD22947

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IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

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IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

Participants
At the time this draft standard was submitted to the IEEE-SA Standards Board for approval, the Revision of
Fuse Standards Working Group had the following membership:

John G. Leach, Chair

James Wenzel, Secretary/Vice Chair

Glenn R. Borchardt Gary Haynes Bobby Moorhead

Chris Borck Blake Henard Chris Morton
Samuel Chang Frank C. Lambert Timothy Royster
Sterlin Cochran Chris Lettow Jon Spencer
Raymond C. Darden Bradley Lewis Tom Stefanski
Anil Dhawan Alex Lizardo Dustin Sullivan
Rodolfo Elizondo Jim R. Marek Randy Ward
Emily Goss Pete Marzec Alan Yerges
Sean Moody

The following members of the individual balloting committee voted on this standard. Balloters may have
voted for approval, disapproval, or abstention.

Chris Ambrose David Gilmer Bansi Patel

Glenn Borchardt Edwin Goodwin Timothy Robirds
Jeffrey Brogdon Randall Groves Thomas Rozek
Demetrio Bucaneg Jr Gary Haynes Bartien Sayogo
Thomas Callsen Werner Hoelzl Jerry Smith
Paul Cardinal Yuri Khersonsky Jon Spencer
Michael Chirico Jim Kulchisky Tom Stefanski
Sterlin Cochran Frank Lambert Gary Stoedter
Jonathan Deverick John Leach David Tepen
Gary Donner Bradley Lewis Mark Tostrud
Edgar Dullni Alex Lizardo James Van De Ligt
Rodolfo Elizondo Sean Moody John Vergis
Sergio Flores Joe Nims Alan Yerges
T. W. Olsen

When the IEEE-SA Standards Board approved this standard on 6 December 2017, it had the following
membership:

Jean-Philippe Faure, Chair

Gary Hoffman, Vice Chair
John D. Kulick, Past Chair
Konstantinos Karachalios, Secretary

Chuck Adams J. Travis Griffith Daleep Mohla

Masayuki Ariyoshi Michael Janezic Damir Novosel
Ted Burse Thomas Koshy Ronald C. Petersen
Stephen Dukes Joseph L. Koepfinger* Annette D. Reilly
Doug Edwards Kevin Lu Robby Robson

*Member Emeritus

6
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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

Introduction

This introduction is not part of IEEE Std C37.41-2016/Cor 1-2017, IEEE Standard Design Tests for High-Voltage
(>1000 V) Fuses and Accessories—Corrigenda 1.

This corrigenda has been produced to address errors and ambiguities that exist in IEEE C37.41-2016. In
9.2.1 “Description of interrupting tests on expulsion fuses,” Test Series 4 addresses the high TRV condition
that simulates the situation of certain fuses being required to interrupt transformer through-fault conditions.
Before the 2016 revision of IEEE Std C37.41, this Test Series consisted of two tests performed at one
current level, but in the revision this was increased to tests at two current levels, levels above and below a
“transfer current,” This transfer current was to be that at which the fuse link gas-evolving tube burst, and
the details of the testing (limited to fuses that use replaceable links) appears in 9.2.2.2.3, “Test Series 4.” In
the revision, an error was introduced in 9.2.2.2.3, specifying “burst” conditions for the “non-bursting”
current. This error prevents fuses from being tested to the letter of the standard. However upon further
testing to the revised standard it has been found that the concept, as developed, of a “transfer current” was
also in error. It was discovered that some existing successful designs of fuse could not be tested to the
revised standard and give results that enabled compliance with the standard to be claimed. This
corrigendum corrects this error by instead specifying the actual value of the two test currents to be used for
each of the two usual homogeneous series as specified in IEEE Std C37.42-2016 (by their mechanical
characteristics). While the changes to the testing are covered in 9.2.2.2.3, along with an explanation of why
the changes have been made, the associated Table 5, which previously referenced 9.2.2.2 regarding these
tests, has been changed to include the actual tests in order to make the testing easier to understand. This has
also required minor changes to referenced Table 7 and Table 9 and minor clarification in 9.2.2.2.1 and
9.2.2.2.2. In addition, to avoid ambiguity, the description of Test Series 4 in 9.2.1 has been changed to
clarify what fuses are covered by the changes to Test Series 4 that were initiated in the 2016 revision. Also,
an ambiguity in 18.1, “mechanical tests” for expulsion fuses having cutout fuse supports utilizing
polymeric insulators (18.1.1.3 “Test procedure”), has been addressed.

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

Contents

9. Interrupting tests ......................................................................................................................................... 9

9.2 Interrupting tests for expulsion fuses ............................................................................................ 9
9.3 Interrupting tests for current-limiting fuses ................................................................................ 16

18. Tests for expulsion fuses having cutout fuse supports utilizing polymeric insulators ............................ 16
18.1 Mechanical tests .............................................................................................................................. 16

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

IEEE Standard Design Tests for

High-Voltage (>1000 V) Fuses
and Accessories

Corrigenda 1

NOTE—The editing instructions contained in this corrigendum define how to merge the material contained therein
into the existing base standard and its amendments to form the comprehensive standard.

The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, and replace.
Change is used to make corrections in existing text or tables. The editing instruction specifies the location of the
change and describes what is being changed by using strikethrough (to remove old material) and underscore (to add
new material). Delete removes existing material. Insert adds new material without disturbing the existing material.
Insertions may require renumbering. If so, renumbering instructions are given in the editing instruction. Replace is used
to make changes in figures or equations by removing the existing figure or equation and replacing it with a new one.
Editing instructions, change markings, and this NOTE will not be carried over into future editions because the changes
will be incorporated into the base standard.

9. Interrupting tests

9.2 Interrupting tests for expulsion fuses

9.2.1 Description of interrupting tests on expulsion fuses

Change the following list item:

 Test Series 4: For Class A fuses that do not use replaceable fuse links and for Class B fuses,
Vverification of fuse operation with prospective currents in the range of 400 A to 500 A. For Class
A fuses that use replaceable fuse links, verification with currents that depend on the fuse link
current rating (see or as specified in Table 5 and 9.2.2.2).

Change Table 5 and its footnotes as follows:

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

Table 5 —Interrupting performance tests and test circuit parameters for expulsion fuses
Test Series
Parameters Class
1 2 3 4a 4aa 5 4ba 4ca
Power-frequency
A and B Rated maximum voltage, V: +5%, −0% (see footnote ab)
recovery voltage
A See Table 6 See Table 7 See Table 7
TRV See Table See
characteristics B See table 8 (column 1) 8 (column - footnote bc - -
2)
I3, from 0.2 I1
to 0.3 I1
See 9.2.2.2d I5, from
Rated 160 A 1200A 750 A
A cd 600 A 2.7 to 3.3
Prospective maximum 2000 A ±10% ±10% ±10%
I from 0.6 ±10% times fuse
current—rms interrupting 2, ±10%
rated
I1 to 0.8 I1
symmetrical current, I1 I4, from
I3, from current,
+5%, −0% 400 A to
0.2 I1 to - - -
B Ir eg
500 A ef
0.3 I1 d
See Table 9 From 1.3 See Table 9
A See Table 9 (column 1)
X/R ratio (power (column 2) to 0.75 (column 2)
factor) Not less than 15 (not greater than See (from 0.6
B - - -
0.067) Table 10 to 0.8)
Random timing arctan (X/R)±
A
Making angle arctan (X/R)± 10° 10°
1st test: from −5 to +15
related to From 85 to arctan Random
2nd test: from 85 to 105
voltage zero— 105 (X/R)± timing
B 3rd test: from 130 to 150 - - -
degrees 10°From
−5 to +15
Rated current of Max.i See
fuse link or fuse
A Min. Max. Min. Max. Min. Max.
9.2.2.2 Min.j Max.k Min.l
Min.
unitfh B Min. Max. Min. Max. Min. Max. Min. - - -

Number of tests 2 See

A 3 3 3 3 1 1 2 2 2 2
required with 9.2.2.2
above fuse link
or fuse unit B 3 3 3 3 1 1 2 - 2 - -
ratinggm
Number of tests
required before A 3 3 3 3 2 6n 6n
replacing
fuseholder and B 3 3 3 3 2 4m - 4m - -
fuse supportgm
Number of
fuseholders to be A and B 1 1 1 1 1 1no 1no
testedgm
Maximum
number of fuse
supports to be A and B 1 1 1 1 1 1no 1no
testedgm
Number of tests
on each exhaust-
control device, if
B 3 3 3 3 2 4o - 4o - -
applicable
(Table continues)

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

Table 5—Interrupting performance tests and test circuit parameters for expulsion fuses
(continued)

Parameters Class Test Series

1 2 3 4a 4aa 5 4ba 4ca
A and B
(drop- Not less than dropout time, or 0.5 s, whichever is greater
Duration of out)
power- A (non
frequency drop-out) Not less than 0.5 s
recovery voltage
after interruption B (non
drop-out) Not less than 10 minhp Not less than 1 min

a
See 9.2.1 and 9.2.2.2. For Class A fuses rated above 100 A, test series 4, 4a, 4b, and 4c need not be made.
ab
When the fuse is intended to be used only in three-phase effectively grounded circuits, the manufacturer may elect to replace the
Test Series 1 (100% V and 100% I1) by one test duty at 87% V and 100% I1 and a second test duty with 100% V and 87% I1.
The tolerances for voltages and currents are the same as those indicated in Table 5.
bc
The TRV for this test circuit shall be critically damped. Shunting the load reactance with a resistance having a value equal to
approximately 40 times the value of the reactance is usually adequate to critically damp the circuit. However, if this value does not
result in critical damping, then the resistance may be reduced to achieve critical damping. For testing convenience, an oscillatory
TRV may be acceptable with the agreement of the manufacturer. Critical damping is obtained when
fo
R= X where
2 fn
fo is the natural frequency of the test circuit without damping
fn is the power frequency
X is the reactance of the test circuit at power frequency
cd
For fuses with an interrupting rating of 2.8 kA or less, test series 3 need not be made.
d
For Class A fuses rated above 100 A test series 4 need not be made.
e
If the test involves a melting time appreciably higher than 2 s, the current may be increased to obtain a melting time of
approximately 2 s.
f
If the values are lower than those of Test Series 5, then Test Series 4 tests need not be made.
eg
The melting time shall be no less than 2 s. If the test involves a melting time appreciably higher than 2 s, the current may be
increased to obtain a melting time closer to 2 seconds.
fh
“Min” and “Max” represent the minimum and maximum rated currents of a homogeneous series; see 9.2.2
i
“Max” represents the maximum rated current of a homogeneous series, up to and including 50T or its approximate equivalent.
j
“Min” represents the minimum rated current of a homogeneous series, down to and including 6K or its approximate equivalent.
k
“Max” represents the maximum rated current of a homogeneous series, up to and including 100T or its approximate equivalent.
l
“Min” represents the minimum rated current of a homogeneous series, down to and including 65K or its approximate equivalent.
gm
After each test, the refill unit or fuse link and expendable cap (if used) shall be replaced. A fuseholder and fuse support shall be
capable, at a minimum, of the number of tests listed as “Number of tests required before replacing fuseholder and fuse support. Only
the manufacturer has the discretion to permit a fuseholder, or fuse support to be used for more than the specified number of
individual tests.
After each test on a fuseholder that uses replaceable links, only the fuse link and the expendable cap, if used, may be replaced. Only
the manufacturer has the discretion to use an expendable cap for more than one test if it is determined that the cap was not damaged
during a previous test.
If the fuse element is an integral part of the fuseholder, then the number of fuseholders to be tested is the number listed for “Number
of tests required with above fuse link or fuse unit rating.”
The mounting brackets used for the cutout testing should be as specified in IEEE Std C37.42. Any deviation from this specification
shall be noted in the test report for the device.
n
For Class A fuses, Test Series 4, 4a, and 5 shall use the same fuseholder and fuse support. Test Series 4b and 4c shall use a new
fuseholder and fuse support and if the fuse links having a lower current rating than 65K represent a different homogeneous series for
the purposes of Test Series 5, then Test Series 5 shall be performed using the same fuseholder and fuse support as Test Series 4b and
4c.
o
For Class B fuses, Test Series 4 and 5 shall use the same fuseholder, fuse support, and exhaust control device (if applicable).
hp
If leakage current through the fuse is monitored following interruption, then the recovery voltage may be removed after leakage
current has been less than 1 mA for a 2 min duration.

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

Change Table 7 and its footnotes as follows:

Table 7—Inherent TRV test circuit parameters for Class A expulsion fuses, Test Series
4, 4a, 4b, and 4c
Column 1 Column 2 Column 3
Applicable to Table 5, Test Series 4, 4a, 4b, and 4c
Rated
Test current ≤ 350 A Series 4a Test current ≥ 350 A and ≤ 600 A Test current ˃ 600A and ˂ 1200 Ab
maximum
Series 4 Series 4b and 4c
voltage (kV)
Frequency ( f ) Peak factora Frequency ( f ) Peak factora Frequency ( f ) Peak factora
(kHz) +10%, –0% +10%, –0% (kHz) +10%, –0% +10%, –0% (kHz) +10%, –0% +10%, –0%
2.6 to 2.8 25.0 1.55 37.0 1.45 45.0 1.45
5.2 to 5.5 25.0 1.55 37.0 1.45 45.0 1.45
7.8 to 8.3 22.0 1.65 31.0 1.55 37.0 1.55
15.0 to 15.5 17.0 1.7 24.0 1.60 28.0 1.6
22.0 to 27.0 10.0 1.7 15.0 1.60 18.0 1.6
38.0 7.0 1.7 10.0 1.60 12.0 1.6

first TRV peak in kV

a Peak factor = ( ) (
2 × power frequency recovery voltage in kV sin arctan X/R )
X/R is the value from Table 9, Column 2
Peak factor should be determined based on current interruption occurring at the current zero of a symmetrical waveform.
1000
TRV envelope is a (1– cos) shape, with time-to-peak (in µs) =
2 f in kHz
Average rate of rise of the (transient) recovery voltage (in V/µs)
first TRV peak
=
time to peak

= 2 2 (power-frequency recovery voltage in kV) × [sin (arctan X/R)] × (peak factor) × (f in kHz)
b For currents greater than 1200 A use the TRV values from Table 6 column 1.

Change Table 9 as follows:

Table—9 Minimum X/R ratios for Class A expulsion fuses

Column 1 Column 2
Applicable test table and test series
Rated maximum voltage Table 5, Test Series 1, 2, and 3 Table 5, Test Series 4, 4a, 4b, and 4c
(kV)
Rated interrupting
current—symmetrical Minimum X/R Minimum X/R
rms amperes
2.6 to 2.8 ≤ 16 000 5 1.5
5.2 to 5.5 ≤ 12 500 5 1.5
≤ 10 000 8
7.8 to 8.3 1.8
> 10 000 12
≤ 7100 8
15.0 to 17.2 2.4
> 7100 12
≤ 2500 8
22.0 to 27.0 3.7
> 2500 12
38.0 ≤ 10 000 15 5.1

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

9.2.2 Interrupting tests on a homogeneous series of expulsion fuses

9.2.2.2 Homogeneous series requirements for devices that use replaceable fuse links

9.2.2.2.1 Physical requirements

Change list item f) as follows:

f) The dimensions of the gas-evolving tube surrounding the fuse element are excluded when
determining homogeneity for Test Series 1, 2, and 3, but not for Test Series 4, 4a, 4b, 4c, and 5 of
Table 5.

9.2.2.2.2 Fuse link sizes for the tests

Change list item c) as follows:

c) For Test Series 4, the current rating and fuse links to be used are as specified in Table 5 and
9.2.2.2.3.

9.2.2.2.3 Test Series 4

Change the whole text of 9.2.2.2.3 as follows:

Fuses that use replaceable fuse links work as a system to interrupt the full range of possible fault currents.
Generally, the gas-evolving tube that surrounds the fuse element (termed the arc quenching tube or,
commonly, “auxiliary tube”) provides for the expulsion action at low currents, while the fuseholder
provides for the expulsion action at high currents (when the auxiliary tube “bursts”). There is an
intermediate current, termed the transfer current (It), at which the small gas-evolving therefore a range of
currents over which the auxiliary tube bursts and the majority of the interrupting process is transferred from
primarily, the auxiliary tube to the larger-diameter fuseholder tube. Since interrupting a relatively low
current in the fuseholder tube this is known to be a generally difficult condition for the fuse, a test in this
region has always been specified. Traditionally this current was at 400 A to 500 A, which also
corresponded to current levels typical of a common application, interrupting transformer secondary faults.
Prospective current TRV values and X/R values for Test Series 4 were therefore chosen to cover this
application (termed here the “high TRV” condition). In the 2008 revision of this standard it was recognized
that additional testing may need to be performed to demonstrate that the fuse will interrupt correctly in this
“transfer” region, but no attempt was made to specify actual tests or test conditions. In the 2016 revision, it
was also recognized that, Wwith the evolution of fuse design, the correct current to simulate this “worst
case” condition may no longer be in the previously specified range. and so An attempt was therefore made
to formalize additional testing in the region of concern by introducing two test currents It1 and It2, above
and below a transfer current/bursting current (at the lower current, the auxiliary tube was not to burst, while
at the higher current it was to burst). manufacturers are now required to demonstrate satisfactory fuse
interrupting performance above and below the current at which interrupting performance is “transferred”
from the gas-evolving fuse link tube to the fuseholder tube. When manufacturers and test stations attempted
to test various designs to the revised standard, it was found that, in some cases, the prescribed testing
produced a number of problems. One problem that occurred was that for some designs of fuse/fuse link, the
transfer of interruption duty occurred not over a relatively narrow band of currents but rather over a broad
region, and it was found that in this region the same current value could produce both auxiliary tube
“bursting” and “non-bursting” behaviour with different samples of the same design. Furthermore,
difficulties in interpreting what part or parts of the fuse were responsible for the interrupting process, and
what constituted a “burst” auxiliary tube occurred. It was observed that a wide range of damage is possible
to an auxiliary tube, over a range of currents, from barely being scorched on the outside, increasing to small

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

splits and holes in its wall over a small or large portion of its length, up to where most, and in some cases
all, of the tube was consumed or ejected from the fuseholder. Defining “burst”, and determining what, if
any, role the auxiliary tube played in a particular interruption process, therefore proved extremely difficult.

This corrigendum therefore returns to an approach similar to that used until the 2016 revision, with the
required tests specifying particular currents, although the exact tests required now vary with the fuse link
current rating. Class A fuses, that use replaceable fuse links, shall be tested with up to four sets of tests, in
accordance with Table 5, Test Series 4, 4a, 4b, and 4c, rather than the one series of tests previously
specified as Test Series 4.

Class B fuses, and Class A fuses that do not use replaceable links, shall be tested to Test Series 4, which
consists of two tests with a prospective current between 400 A and 500 A. The TRV value for the circuit
shall be that specified in Table 7 column 2.

The reasons behind the choice of testing for Class A fuses using replaceable links follows. There are two
conditions that need to be covered between Test Series 3 (high currents of approximately 2000 A where the
auxiliary tube will play a very minor role in the interrupting performance) and Test Series 5, low current
(where the auxiliary tube will play the major role in interruption). The first condition is in the area of the
transfer current (where the auxiliary tube and fuseholder take greater or lesser roles in the interruption
process above and below the current) and the second condition is the likely circuit parameters experienced
during the interruption process, namely X/R and TRV. Because expulsion fuses are very sensitive to TRV,
the transformer secondary fault current condition is important, and it falls in this transition region. In the
auxiliary tube, high TRV conditions can be difficult to interrupt at lower currents than the “burst” current.
Similarly, when the auxiliary tube has burst, high TRV conditions are difficult for the fuseholder tube to
interrupt. Another factor to be considered is that for a given fuse link, there will be a maximum transformer
secondary fault available, as a fuse using the link cannot supply a transformer larger than a certain kVA
rating. No “high TRV” tests are therefore required above 600A for a fuse link ≤ 50A, and 1200A for a fuse
link >50A and ≤ 100A. Because the TRV values specified for Test Series 1, 2, and 3, make it easier for the
fuse to interrupt at the levels introduced for the Test Series 4 family of currents, no additional testing at
such TRV values is deemed necessary at currents below the Test Series 3 current (i.e. only high TRV tests
are performed in the Test Series 4 range of currents).

The physical dimensions of fuse links specified in IEEE Std C37.42 typically results in 50 A links and
below having a smaller auxiliary tube than links rated ≤100 A. This typically produces two homogeneous
series up to 100 A, so Table 5 specifies testing at two current levels for links >50 A and ≤ 100A and two
current levels for ≤50 A. Due to variations in flexible conductors, and a desire to cover all possibilities,
testing is performed on the maximum and minimum fuse link sizes of two homogeneous series, with the
lower of the two currents using the minimum rating and the higher currents using the maximum. Because
the typical melting times of a particular fuse link size and transformer secondary current will result in
melting times where the current will be symmetrical, a making angle is specified to produce a symmetrical
current.

Circuit conditions for this test are chosen to be appropriate for whatever current is required for the test.
Additionally, while a small (typically 6 K) link was previously specified for this test, a current
corresponding to the bursting current of the tube represents a service application that would generally
require a larger current rating. This would result in a correspondingly longer melting time than for a 6 K
fuse link, which can melt in a few milliseconds at 400 A to 500 A, a test condition in which closing angle
could have a significant effect on performance. An appropriate-sized link is now specified, with a melting
time long enough that the closing angle is irrelevant.

For fuse cutouts, and other fuses that use replaceable fuse links in a fuseholder, Test Series 4 shall be
performed at a minimum of two values, It1 and It2. At least two tests shall be performed at each test value.

It1 = 0.8 It (±0.05 It)

and

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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

It2 = 1.2 It (±0.05 It)

where It is the value of transfer current, the current at which the gas-evolving tube bursts.

The tests using current It1 shall result in the fuse link gas-evolving tube bursting, while the tests at It2 shall
result in the fuse link gas-evolving tube not bursting.

The fuse link used for the series 4 test shall be chosen from the homogeneous series being tested and can be
any K speed link in the homogeneous series such that the minimum melting time (from the link’s time-
current characteristic) is at least 0.025 s. If there is no K speed link with a melt time of at least 0.025 s in
the homogeneous series being tested, then the maximum-sized K speed fuse link in the homogeneous series
shall be used and the close angle of the tests shall be between 85 degrees and 105 degrees to eliminate any
possible effect of asymmetry.

Prospective current X/R values shall be as specified in Table 9 and TRV values shall be as specified in
Table 7.

It should be recognized that there are practical upper limits of secondary fault currents for a given fuse link
size. Fuse links rated up to 50 A, for example, will normally be applied on circuits whereby there is a
magnitude of current beyond which the fault would no longer be a secondary fault and instead would be a
primary fault. Primary fault circuits have significantly less severe TRV parameters, and thus testing to these
circuits using primary fault TRV values is trivial and therefore shall not be required as part of Test Series 4.
For this reason, a user performing the above-mentioned tests for Test Series 4 would no longer need to test
beyond a given current magnitude for each homogeneous test series as follows:

For fuse links rated up to 50 A, if it can be demonstrated for a given homogeneous series that the transfer
current It is greater than 600 A, then the required tests at It1 and It2 shall not be required. Similarly, for fuse
links rated between 50 A and 100 A, if it can be demonstrated for a given homogeneous series that the
transfer current It is greater than 1200 A, then the required tests at It1 and It2 shall not be required.

In order to prove the requirements defined in the previous paragraph, two tests can be performed per
homogeneous series at a current no less than 600 A (for fuse links rated up to 50 A) or 1200 A (for fuse
links rated between 50 A and 100 A). The fuse links used for these tests shall be chosen from the
homogeneous series being tested and can be any K speed link in the homogeneous series such that the
melting time (from the link’s time-current characteristic) is at least 0.025 s. If there is no K speed link in
the homogeneous series being tested, then the maximum-sized K speed fuse link in the homogeneous series
shall be used and the close angle of the tests shall be between 85 degrees and 105 degrees to eliminate any
possible effect of asymmetry. All other circuit parameters and performance requirements for these tests
shall be as defined in Table 5. The fuse link sheath shall remain intact during these tests. If the fuse link
sheath does NOT remain intact during these tests, then the aforementioned tests for It1 and It2 shall be
performed.

If a Class A fuse does not use a replaceable fuse link, Test Series 4 shall consist of two tests with a
prospective current between 400 A and 500 A. The TRV value for the circuit shall be that specified in
Table 7 column 2.

15
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 IEEE Std C37.41™-2016/Cor 1-2017
IEEE Standard Design Tests for High-Voltage (>1000 V) Fuses and Accessories—Corrigenda 1

9.3 Interrupting tests for current-limiting fuses

9.3.1 Test Series

Change the equation in Note 2 as follows:

NOTE 2—As a guide, the value of the current I 2 to comply with this requirement may be determined by one of the
following methods:
a) From the following equation, if one test at a current 150 times the current rating or higher has been made
under symmetrical fault initiation in series 1:

i1
I2 = I1i1
I1

where

I2 is prospective current for Series 2

i1 is instantaneous current at instant of melting in Series 1

I1 is prospective current in Series 1

b) By taking between three and four times the current that corresponds to a melting time of 0.01 s on the
time/current characteristic.

18. Tests for expulsion fuses having cutout fuse supports utilizing
polymeric insulators

18.1 Mechanical tests

18.1.1 General

18.1.1.3 Test procedure

Change list item f) as follows:

f) Once per cycle, a series of 50 mechanical open-close operations shall be are performed on each
sample, using whatever device is recommended by the manufacturer. The operations are performed
at the end of the soak period, with Ttwenty-five open-close operations shall be performed on each
side of the sample, at a minimum angle of 30 degrees offset from center. The operations shall be
performed when the assemblies are at the temperature extremes The preferred sequence is to
perform 50 open-close operations in the first cycle with the device cold, and 50 operations in the
second cycle with the device hot, this being repeated in the third and fourth cycles. and the
operations should alternate between the temperatures However, any sequence is acceptable,
providing that such that a total of 100 operations are shall be performed on each side of each
sample, for a total of 200 operations per sample, and also that 100 of the operations shall be
performed at −30 °C and 100 operations are performed at 40 °C.

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