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

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DSH 597

Verificaton of main contact position, position of the actuator 0 z. \, g7 a8 l. n

8.3.3.9 4 `0 s1 V0 h6 k

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

* W) t6 Y1 e; l7 p! O4 b' K8 f+ N% }Standard(s): IEC60947-1, IEC60947-
: Z: N0 S4 B6 s& i$ |2
* c5 m5 c+ F# O6 zSub clause(s):
  H- u3 q3 k% y+ B, b8.2.5.3 of IEC60947-1 and
1 ^5 e2 R- S0 L8.3.3.9 of IEC60947-2
DSH
597
8 f4 ~# ^. E9 }( Z  SSubject:
3 L  W1 [6 i" X. B# `& QVerification of main contact
! j2 P% [* D* @7 H" xposition, position of the actuator
Key words:
( J1 t( {6 O. m9 E0 \- suitable for isolation
- indication of contact
7 {. ]0 r/ I- y; f7 L. e' _position
Decision approved by
4 P$ p# p  u0 fthe 44th CTL Plenary
meeting 2007
0 O$ o, s! j: O; BQuestion:
Verification of the main contact position is conducted only on products suitable for isolation. This is an
additional 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
0 `. c9 Y3 S- o$ u. N2 Upass 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
5 [% u6 b( \+ `' E% o# A4 `should section 7.1.6.1 (additional (constructional) requirements) be interpreted?
- d, Z% ^' _% m7 w* xProposal:
There are two possibilities, depending on the features of the breaker:
1) The indicator is the actuator, and it is the only position indicator, or
3 p/ \1 s6 W6 |: C2) There is an actuator that may show the operating position, but in addition there is a
; V4 w: m% A, ?. c2 o, C: x+ q1 @separate position indicator.
& u4 ^5 b4 Z8 I3 Q5 t: bFor construction per item 1, this result is not acceptable
For construction per item 2, the result described is acceptable if the separate position
- s8 e  U& j% I1 s' f8 }indicator unambiguously shows the closed position, irrespective of the rest position of the
actuator.
4 E- W: Q0 c' b& F6 z* A/ aRefer to IEC 60947-1, Clause 7.1.6.1

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