DSH 1033 Separation of welded contacts after short-circuit test

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DSH 1033 " k, C' B) g8 w2 }3 P* D

Separation of welded contacts after short-circuit test / [8 Z- B+ r5 l4 `3 [4 n; d9 A6 l

9.3.4.2.3.j (60947-4-1) 8.3.2.1 (60947-1) ) E7 t- ]# `" R

60947-1(ed.5) & 60947-4-1(ed.3) % h( h& A$ U# b+ v

8 Z4 L2 d5 T  p  H! J0 iCTL 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)
8 d+ p% X9 X# h- B1 ]. y& KSC 17B/Publication IEC 60947-4-1 Edition 3.0 2009-09
7 v/ v: `! y* C0 a5 X! gLow-voltage switchgear and controlgear –
Part 4-1: Contactors and motor-starters – Electromechanical contactors and
; @6 P1 I; ?$ R- e8 E; gmotor-starters
INTERPRETATION SHEET
This interpretation sheet has been prepared by IEC SC17B/WG2 on 2012-09-06
, l6 @# l0 J; o4 e: D0 f1 L& u. mThe text of this interpretation sheet is based on the following documents:
- K6 [3 w/ R0 ?0 xIEC 60947-4-1 ed 3: 2009
___________
Interpretation
5 I! n; X! u( a. l; R# h5 ?In Clause:
9.3.4.2.3 Results to be obtained
5 ]8 t4 O/ _3 `. UThe 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
/ U! ]+ p9 W2 wtests 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.
" t  i4 E5 m& R5 C  Y6 d. JType "2" co-ordination (all devices):
J No damage to the overload relay or other parts has occurred, except that welding of
# O  w) _$ g. ?0 Jcontactor or starter contacts is permitted, if they are easily separated (e.g. by a
( Z6 z3 y6 U# n7 W9 ~* tscrewdriver) without significant deformation, but no replacement of parts is permitted
; H; }' a' U' Y6 ?5 G9 O2 f% X, vduring 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
$ h* t7 O! W6 r$ X1 _0 h: F0 ebe 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
4 T: V6 F; S1 h( @- Using a tool (eg. a screwdriver) for separating the welded contact or for moving an operating
means.
% u9 z: W( }; H: O4 @% I$ QIt is also allowed to remove covers or housing of the contactor according to the instruction of
: J' c! c/ J; o. }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
; L* k2 h" ~4 }2 Z2 Zspecified in the last paragraph of J.

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