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

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DSH 593

New glow wire test requirments (650 C) for parts close to contacts + m( N3 `  r: F. j7 W  D* p' @

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) / r9 `" o2 |3 S: ?6 N, ?

Standard(s)- (year and edition):
% y  K% s# C9 K+ F3 U4 rIEC 60947-1:2004 IEC 61058-1:2000
Sub clause(s):
& N3 q0 W9 w, o% B0 j0 t" tClause 7.1.1.1 of IEC 60947-1 Clause 21.1.5 of IEC 61058-1
Sheet n°:
DSH 593
4 Q0 k* ]! [, Y# r7 HSubject:
New glow wire test requirements (650 °C) for parts close to contacts
: \4 l7 T$ R# i! S( W) UKey words:
( V9 d* x6 b- g0 `9 o9 K- glow wire
Decision approved by the 44th CTL meeting 2007
8 y* |& ^2 G+ J4 a6 y7 y# ?! ?6 XQuestion:
8 s' z( j+ V6 ZDue 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:
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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