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

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DSH 597 * Y8 N: L/ c1 J

Verificaton of main contact position, position of the actuator 9 r# {7 r& a0 `

8.3.3.9 7 _' D0 f  h2 z4 i5 Y4 i

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 ; A/ s6 ?/ Q2 F; A

' f4 Z; \! a. Q' ~- A7 v; SStandard(s): IEC60947-1, IEC60947-
2
) w# R( ]& y: r/ n% ]! Q2 F! bSub clause(s):
4 D, ]9 s4 T; K" j; Y1 x8.2.5.3 of IEC60947-1 and
+ s8 J7 W1 l/ S3 e; W8.3.3.9 of IEC60947-2
DSH
597
- x' O: A  s/ i+ q" d1 FSubject:
Verification of main contact
4 J7 @+ T( ?2 a9 k! qposition, position of the actuator
Key words:
& H1 {; R* ~1 o- suitable for isolation
- indication of contact
# W, ]( ~8 a4 U7 pposition
: I' K- V; ?: v1 g7 VDecision approved by
" z) \; D2 q8 P* vthe 44th CTL Plenary
meeting 2007
Question:
Verification of the main contact position is conducted only on products suitable for isolation. This is an
8 e# s+ [4 C1 Q5 Q) s2 @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 T5 j4 @% H5 e2 X9 npass when tested according 8.2.5.3 of IEC60947-1?
6 r( J; L' H% J8 T& _% jQ2: 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?
8 z; n1 I, Z& B  PProposal:
" }& M. H" S7 d3 a7 F0 t7 wThere are two possibilities, depending on the features of the breaker:
1) The indicator is the actuator, and it is the only position indicator, or
2 Y. B  ^: r# h  l2) There is an actuator that may show the operating position, but in addition there is a
separate position indicator.
& N. D# S% C# I' u7 I3 l6 ^4 \For construction per item 1, this result is not acceptable
9 P4 ~; }9 W: W' @" M" G6 Y2 wFor 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
2 j$ e/ ~2 o' k( n; Mactuator.
Refer to IEC 60947-1, Clause 7.1.6.1
9 _6 b* w+ S' o) t

: Q$ U; w5 g) }' {8 Q3 }) d; @6 t
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