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

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DSH 597 * h" e  y/ u0 G3 N3 n% P8 B( ?

Verificaton of main contact position, position of the actuator

8.3.3.9

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 8 ]* |7 |9 R- g, K5 E

6 S0 W! \4 K  ]4 ZStandard(s): IEC60947-1, IEC60947-
2
Sub clause(s):
& Q) Y3 Q5 A2 B  Y$ S5 X8.2.5.3 of IEC60947-1 and
8.3.3.9 of IEC60947-2
- @0 }( Z% Z. f3 aDSH
597
Subject:
Verification of main contact
position, position of the actuator
1 t9 S$ J- Y# r0 [Key words:
- suitable for isolation
1 l* m1 g+ z8 ~" S$ h% W: n- indication of contact
6 q: n5 l, C% qposition
3 g4 q8 X. ^$ e/ ]$ |' `8 J  FDecision approved by
the 44th CTL Plenary
meeting 2007
2 z( f; B/ A$ _' v6 {8 y& eQuestion:
6 i2 A% T' a3 F/ w, M2 HVerification of the main contact position is conducted only on products suitable for isolation. This is an
4 d9 H( t+ A5 ~5 b' `; v, sadditional requirement to be verified.
Q1: 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
% W0 i  F1 Y* Gpass 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
should section 7.1.6.1 (additional (constructional) requirements) be interpreted?
/ A8 e' E0 k' G; g8 ]- kProposal:
* x* Q0 s3 M* I1 G5 nThere are two possibilities, depending on the features of the breaker:
1) The indicator is the actuator, and it is the only position indicator, or
- N4 u- i' U2 |/ A, {% l2) There is an actuator that may show the operating position, but in addition there is a
/ ]6 f' H7 y; I$ x6 a) z' ^separate position indicator.
# Q! ~5 F6 q  `+ H! K/ b7 Z  rFor construction per item 1, this result is not acceptable
4 Y4 [0 Q9 I5 Z& y/ g8 M' TFor construction per item 2, the result described is acceptable if the separate position
indicator unambiguously shows the closed position, irrespective of the rest position of the
  q( ]1 d) s- j8 g  J( M, i; p/ D9 Zactuator.
" C, l  H3 T$ p6 V) BRefer to IEC 60947-1, Clause 7.1.6.1
( Q) D0 y$ Q( _6 ~5 ^
! X) W" H! e$ h$ P, b
  `& ?# e4 r; e) y2 m+ x( x. [, z
+ Q  S7 U$ C+ `