DSH 1033 Separation of welded contacts after short-circuit test

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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) # E+ e, W' p4 K, q

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,
% V; x, W8 ^  P' L! C5 Wwill be kept remaining until final decision by 50th CTL Plenary Meeting)
- R0 {* [* e9 KSC 17B/Publication IEC 60947-4-1 Edition 3.0 2009-09
Low-voltage switchgear and controlgear –
2 y' `6 n* o; E5 r8 Y: e, hPart 4-1: Contactors and motor-starters – Electromechanical contactors and
0 t  H) ~3 ]0 \" Q% {! |& K( G9 d+ xmotor-starters
: Y# i; a8 `* k: W, dINTERPRETATION SHEET
2 }! ]" Q% a* J( R+ QThis interpretation sheet has been prepared by IEC SC17B/WG2 on 2012-09-06
) Q9 c, P1 b7 K' KThe text of this interpretation sheet is based on the following documents:
IEC 60947-4-1 ed 3: 2009
___________
Interpretation
; C) w( O2 _) X/ j4 s0 Y$ rIn Clause:
( c7 C9 ?4 ]5 I8 L/ q1 ?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
' k6 G7 }# l; U: }  i8 dtests 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):
; U1 {2 s9 V5 A+ V1 x6 KJ No damage to the overload relay or other parts has occurred, except that welding of
5 P0 K+ z$ h8 ]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
3 ~6 E- |: o+ b4 V! ?$ }' Pduring the test, except that, in the case of fuse protection, all fuse-links shall be replaced.
3 l6 _# ]4 y, V  OIn 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
2 D+ o' b. u- x+ Lapplicable utilization category.
8 u: M( l; I7 w' \6 r7 Y# X$ _8 qThe text "if they are easily separated (e.g. by a screwdriver) without significant deformation"
shall be interpreted as follows:
6 y# H: O% O) y"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.
+ H: U3 [' H/ Z+ G3 lIt is also allowed to remove covers or housing of the contactor according to the instruction of
' e+ J2 @8 f% Gthe manufacturer.
' H' S) ^% x/ E; g; r" Z"Without significant deformation" means a deformation without impairing the insulation of the
$ X: _" r* ]! ^* M! e7 Gcontactor (see d) and i) of this Clause) and successfully performing the 10 operation cycle
, l- ~( @8 q! F$ @3 c' Q6 fspecified in the last paragraph of J.
3 I9 u9 ?& J/ A1 _