DSH 593 New glow wire test requirments (650 C) for parts close to contacts

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DSH 593 , \/ t9 y6 J9 i5 h& _# V1 H* G

New glow wire test requirments (650 C) for parts close to contacts ) G: x# k" M7 Q) `

Clause 7.1.1.1 of IEC 60947-1 Clause 21.1.5 of IEC 61058-1

61058-1(ed.3) & 60947-1(ed.4) ) E4 y6 }1 C2 w9 Q

) ?; l8 V9 I5 h" h$ I' ?. qStandard(s)- (year and edition):
, R5 c3 O( s/ J( {IEC 60947-1:2004 IEC 61058-1:2000
Sub clause(s):
Clause 7.1.1.1 of IEC 60947-1 Clause 21.1.5 of IEC 61058-1
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' C+ s! \' r' ]  ]: w) R$ L# c. |DSH 593
Subject:
$ m1 K# l9 Z# n: ~6 k" l3 h2 E0 {New glow wire test requirements (650 °C) for parts close to contacts
Key words:
- glow wire
Decision approved by the 44th CTL meeting 2007
Question:
Due to the new requirements of 60947-1:2004, parts close to contacts are subject to glow wire test performed at temperature of 650 °C. Is a glow wire test necessary for the green part (figure 1) or isn’t a glow wire test required for this part?
2 @3 n" M. W2 E/ N8 lDecision:
Although the green part (figure 1) of this switch is mechanically separated from the contact element, the glow wire test should be done with 650 °C. During normal operation, the switching element and the contact element are mounted together. Due to this fact and the relatively large amount of material, a test should be done.
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