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

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DSH 597 + D- K8 b6 v& S$ B' j! N/ ]

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 2 d! Q% t$ z  Z

Standard(s): IEC60947-1, IEC60947-
2 L- J8 B, e* V+ G* W2 @: f) X; k2
9 a- f$ H4 `( ?, A: k% }, m9 h: }2 P* uSub clause(s):
/ B0 Y  Z8 x& Y5 B- ?8.2.5.3 of IEC60947-1 and
& @5 [6 b9 `5 j8.3.3.9 of IEC60947-2
DSH
597
Subject:
Verification of main contact
position, position of the actuator
Key words:
- suitable for isolation
( h  ~! i' s9 V# z8 Z- indication of contact
position
Decision approved by
the 44th CTL Plenary
& M! C1 a- \( M  R# E1 Lmeeting 2007
Question:
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
0 L! Y7 O. V! _4 \neither consistent with the tripped nor with the open position markings as indicated on the product). Is this a
4 X: I. g$ W( e$ b2 J9 v" _pass when tested according 8.2.5.3 of IEC60947-1?
8 F* K8 M3 C# sQ2: If the answer of Q1 is yes, is this in conflict with the general constructional requirements of 7.1.5? How
% g5 y8 P1 F% h5 dshould section 7.1.6.1 (additional (constructional) requirements) be interpreted?
Proposal:
There are two possibilities, depending on the features of the breaker:
. s: n% p# g7 ^& ]+ F( A3 y1) The indicator is the actuator, and it is the only position indicator, or
2) 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
7 _4 ^) P& a8 z& {$ m0 m# Uindicator unambiguously shows the closed position, irrespective of the rest position of the
actuator.
Refer to IEC 60947-1, Clause 7.1.6.1

. Z3 |+ j7 Q' _; s$ |+ X3 V  ?" C
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