DSH 1033 Separation of welded contacts after short-circuit test

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DSH 1033 5 h% ]1 A2 B% F

Separation of welded contacts after short-circuit test + }2 x& B; t% [0 ?2 H

9.3.4.2.3.j (60947-4-1) 8.3.2.1 (60947-1)

60947-1(ed.5) & 60947-4-1(ed.3) + u0 L" t' g2 K5 X+ \

CTL Decision Sheet - DSH 1033
* d6 `5 v9 @0 W( w(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
8 g9 H3 N+ x# A( Z3 S2 |2 tThis interpretation sheet has been prepared by IEC SC17B/WG2 on 2012-09-06
) B2 Y! a' P" f! y/ v( A. `$ gThe text of this interpretation sheet is based on the following documents:
IEC 60947-4-1 ed 3: 2009
5 K5 i. W( q0 P% p; o* i___________
; d& J' |' N/ yInterpretation
9 }3 n/ B" L, I3 n6 xIn Clause:
9.3.4.2.3 Results to be obtained
- A+ h& L# R+ B0 E! a2 T! Q- R! \The contactor, starter, or the combination starter, the combination switching device, the
5 H; j; j( s& J+ W) ~* Rprotected 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
% C& h/ c& q; O& c3 [& r% _following conditions are met for the claimed type of co-ordination.
Type "2" co-ordination (all devices):
3 C5 F3 q; L" f: @) Z$ R! cJ No damage to the overload relay or other parts has occurred, except that welding of
* [4 M( @3 v6 |+ Jcontactor or starter contacts is permitted, if they are easily separated (e.g. by a
1 s& V' U. `5 F9 A8 z0 b0 m- ^0 {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.
+ ]; U4 Y6 N+ ?7 ]! {In the case of welded contacts as described above, the functionality of the device shall
$ c' O3 _' P# T; Vbe verified by carrying out 10 operating cycles under the conditions of Table 8 for the
applicable utilization category.
0 s# B3 F0 [5 @# Q9 m& A8 xThe text "if they are easily separated (e.g. by a screwdriver) without significant deformation"
2 B' O' N% }# g! K6 T" cshall be interpreted as follows:
$ \1 i( J, h* S4 W8 y"Easily separated" means a separation realised on site for example by:
9 G( O/ L/ ?9 S/ j- Energizing the coil of the contactor
- Using a tool (eg. a screwdriver) for separating the welded contact or for moving an operating
means.
& }4 H+ ?$ e' n0 GIt 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
% L, a7 i/ |, d0 \! Dspecified in the last paragraph of J.
: N. E+ C  e' B- \6 y" w7 H  A