IEC 61051-2:1991/AMD1:2009

IEC 61051-2 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Varistors for use in electronic equipment –
Part 2: Sectional specification for surge suppression varistors

Varistances utilisées dans les équipements électroniques –
Partie 2: Spécification intermédiaire pour varistances pour limitations de
surtensions transitoires
IEC 61051-2:1991/A1:2009
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IEC 61051-2 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Varistors for use in electronic equipment –
Part 2: Sectional specification for surge suppression varistors

Varistances utilisées dans les équipements électroniques –
Partie 2: Spécification intermédiaire pour varistances pour limitations de
surtensions transitoires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
E
CODE PRIX
ICS 31.040.20 ISBN 978-2-88910-402-4
– 2 – 61051-2 Amend. 1 © IEC:2009
FOREWORD
This amendment has been prepared by IEC technical committee 40: Capacitors and resitors
for electronic equipment.
The text of this amendment is based on the following documents:
CDV Report on voting
40/1931/CDV 40/1974/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
1.3 Related documents
Add the following new reference:
IEC 60664-1:1992, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
Add, after subclause 2.3.5, the following new subclause:
2.3.6 Combination pulse
Annex A, with the following details which depend on the installation condition of the apparatus,
in which the varistors are used (see IEC 60664-1, 2.2.2).

Combination pulse
Voltage line to neutral derived from nominal voltage a.c. or d.c. up to and
(based on overvoltage
including
category I, II and III of
IEC 60664-1)
I II III
1,5 kV / 2,5 kV / 4,0 kV /
300 V
0,75 kA 1,25 kA 2,0 kA
2,5 kV / 4,0 kV / 6,0 kV /
600 V
1,25 kA 2,0 kA 3,0 kA
61051-2 Amend. 1 © IEC:2009 – 3 –
3.2.2 Tests
Add, after Notes 1 to 3 the following new Note 4:
NOTE 4 The pulse current test and the combination pulse test are considered to be alternative.
The detail specification shall indicate which test is performed. The combination pulse test should be performed in
accordance with Annex A.
Table I
Replace the text related to Group 1 of Table I by the following new text:

Sample size &
D
criterion of
Subclause number and Performance
or Conditions of test
acceptability
test requirements
ND (see Note 1)
(see Note 2)
(see Note 1) (see Note 1)
n c t
Group 1 D 8 1 3
Pulse current
4.5 Pulse current
10 pulses 8/20 μs, in one
(or combination
direction, 2 per min
pulse, see Note 4).
- Visual examination
No
...