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

8.3.3.9 ( M& ~% C# N8 w! w

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 ) x3 g7 l2 F) ~% R' c: f

4 V0 I  H- f% p; i3 f. yStandard(s): IEC60947-1, IEC60947-
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Sub clause(s):
8.2.5.3 of IEC60947-1 and
8.3.3.9 of IEC60947-2
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597
Subject:
Verification of main contact
+ A( l8 R$ Y" z% K9 B7 |$ |3 f. Pposition, position of the actuator
Key words:
: @( {, F$ g7 z' ~) Z) V) O- suitable for isolation
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position
Decision approved by
the 44th CTL Plenary
$ z; j( a' B0 G$ R8 h& s+ `- Fmeeting 2007
/ r0 }2 S* f5 a' MQuestion:
2 B  Y+ O! A) w/ B5 g6 dVerification of the main contact position is conducted only on products suitable for isolation. This is an
9 N! L+ L, g/ R# S+ [. _, n- Iadditional requirement to be verified.
4 K+ K! b- a- f7 O# H4 }" k: ~# MQ1: 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
$ v. U9 K6 V( Wpass when tested according 8.2.5.3 of IEC60947-1?
5 I$ [$ v. n3 y! k, U0 QQ2: If the answer of Q1 is yes, is this in conflict with the general constructional requirements of 7.1.5? How
# U8 c6 ~( \: t' j- P0 R0 xshould section 7.1.6.1 (additional (constructional) requirements) be interpreted?
+ X! n! \4 J- v4 w: C+ _" TProposal:
7 P! a# K/ f5 s$ \: @+ MThere are two possibilities, depending on the features of the breaker:
1 E8 c+ E3 P0 {' G: L' ~% P1) The indicator is the actuator, and it is the only position indicator, or
: K1 w7 o1 e! _! M2) There is an actuator that may show the operating position, but in addition there is a
$ O, x- L% D' s: z: oseparate 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
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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