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

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DSH 593 * ~" Y: I* t! Z! P

New glow wire test requirments (650 C) for parts close to contacts - K. P7 l. E# v( F9 u* a/ K" {

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)

! t5 S! S; \2 q+ e" sStandard(s)- (year and edition):
IEC 60947-1:2004 IEC 61058-1:2000
* H' a1 l; g, l& mSub clause(s):
Clause 7.1.1.1 of IEC 60947-1 Clause 21.1.5 of IEC 61058-1
Sheet n°:
DSH 593
Subject:
New glow wire test requirements (650 °C) for parts close to contacts
( G' E& f1 ]/ R- G0 g! H& g0 JKey words:
- glow wire
Decision approved by the 44th CTL meeting 2007
- f3 v4 T0 I0 R5 ~) T  RQuestion:
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?
Decision:
  y' ^6 h6 X# h! u, f( [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.