DSH 597 Verificaton of main contact position, position of the actuator

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DSH 597 % `0 v+ n" s' f0 n" A

Verificaton of main contact position, position of the actuator

8.3.3.9 ( i9 Z8 _2 \* U# S4 r3 S( j  c

60947-1(ed.1);am1 & 60947-1(ed.2) & 60947-1(ed.2);am1;am2 & 60947-1(ed.3) & 60947-1(ed.3);am1;am2 & 60947-1(ed.3);am2 & 60947-1(ed.4) & 60947-1(ed.5) & 60947-1(ed.5);am1 & 60947-2(ed.1);am1 & 60947-2(ed.2) & 60947-2(ed.2);am1;am2 & 60947-2(ed.3) & 60947-2(ed.4) & 60947-2(ed.4);am1 4 `" [, k7 h8 M- C0 x' L9 I; P4 i

/ ^* ^5 P1 R# z5 uStandard(s): IEC60947-1, IEC60947-
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' B7 c- ]$ F2 I% Z) rSub clause(s):
9 l# r- q& R0 C8.2.5.3 of IEC60947-1 and
, ~3 f8 T# x1 K: c# W8 @( S' N8.3.3.9 of IEC60947-2
DSH
% [% y7 w$ D! s: S597
Subject:
Verification of main contact
: J8 x5 P# m) L- `3 u8 Kposition, position of the actuator
( K& r! n0 G" ]. j2 |+ F- _Key words:
/ h. N4 u0 G4 t3 z( V% ]4 B- suitable for isolation
- indication of contact
position
7 X+ e: y+ w2 g1 Z9 _* G6 s0 U6 hDecision approved by
the 44th CTL Plenary
1 t6 _: m6 l3 J) ?3 A- ]6 A6 smeeting 2007
Question:
Verification of the main contact position is conducted only on products suitable for isolation. This is an
additional requirement to be verified.
0 g' m* N& ~" r% S4 d* s  ~9 bQ1: After the 3F test, the actuator comes to rest in a position between the trip and open position (which is
neither consistent with the tripped nor with the open position markings as indicated on the product). Is this a
pass when tested according 8.2.5.3 of IEC60947-1?
Q2: If the answer of Q1 is yes, is this in conflict with the general constructional requirements of 7.1.5? How
$ W5 J4 C9 Y+ n6 [' L$ @7 o+ X) pshould section 7.1.6.1 (additional (constructional) requirements) be interpreted?
1 X4 P8 l  e* g* F* DProposal:
9 S; `) K: m0 B9 i( w: {There are two possibilities, depending on the features of the breaker:
! O: Q% A! ]& E& E; P4 X/ S1) The indicator is the actuator, and it is the only position indicator, or
: d, u1 S1 O" C2) There is an actuator that may show the operating position, but in addition there is a
separate position indicator.
For construction per item 1, this result is not acceptable
For construction per item 2, the result described is acceptable if the separate position
: F$ Y5 g0 H) K* o$ f3 \indicator unambiguously shows the closed position, irrespective of the rest position of the
actuator.
Refer to IEC 60947-1, Clause 7.1.6.1

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* H9 P' R  P8 p. F3 b