DSH 1033 Separation of welded contacts after short-circuit test
http://decisions.iecee.org/icons/ecblank.gif DSH 1033
Separation of welded contacts after short-circuit test
9.3.4.2.3.j (60947-4-1) 8.3.2.1 (60947-1)
60947-1(ed.5) & 60947-4-1(ed.3)
CTL Decision Sheet - DSH 1033
(replaces PDSH 1033 on 2012-10-22 by CTL Chairman decision,
will be kept remaining until final decision by 50th CTL Plenary Meeting)
SC 17B/Publication IEC 60947-4-1 Edition 3.0 2009-09
Low-voltage switchgear and controlgear –
Part 4-1: Contactors and motor-starters – Electromechanical contactors and
motor-starters
INTERPRETATION SHEET
This interpretation sheet has been prepared by IEC SC17B/WG2 on 2012-09-06
The text of this interpretation sheet is based on the following documents:
IEC 60947-4-1 ed 3: 2009
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Interpretation
In Clause:
9.3.4.2.3 Results to be obtained
The contactor, starter, or the combination starter, the combination switching device, the
protected starter or the protected switching device, shall be considered to have passed the
tests at the prospective current "r" and, where applicable, the prospective current Iq, if the
following conditions are met for the claimed type of co-ordination.
Type "2" co-ordination (all devices):
J No damage to the overload relay or other parts has occurred, except that welding of
contactor or starter contacts is permitted, if they are easily separated (e.g. by a
screwdriver) without significant deformation, but no replacement of parts is permitted
during the test, except that, in the case of fuse protection, all fuse-links shall be replaced.
In the case of welded contacts as described above, the functionality of the device shall
be verified by carrying out 10 operating cycles under the conditions of Table 8 for the
applicable utilization category.
The text "if they are easily separated (e.g. by a screwdriver) without significant deformation"
shall be interpreted as follows:
"Easily separated" means a separation realised on site for example by:
- Energizing the coil of the contactor
- Using a tool (eg. a screwdriver) for separating the welded contact or for moving an operating
means.
It is also allowed to remove covers or housing of the contactor according to the instruction of
the manufacturer.
"Without significant deformation" means a deformation without impairing the insulation of the
contactor (see d) and i) of this Clause) and successfully performing the 10 operation cycle
specified in the last paragraph of J.
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