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 * j, S! k" T# W) ]7 o) b1 ^- _

Clause 7.1.1.1 of IEC 60947-1 Clause 21.1.5 of IEC 61058-1 5 U* ?$ D9 U7 o; A+ a7 z

61058-1(ed.3) & 60947-1(ed.4) 6 {! ~( J/ {  ~' a) J6 K* b& G

& H: I" k! L0 Y+ vQuestion:
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:
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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