DSH 568 Varistors (VDR’s) across the mains

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广东安规检测
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DSH 568

Varistors (VDR’s) across the mains

19.11

60335-1(ed.4) 1 S! a! x. ^  s- R

9 }8 J# A, B4 T5 p% w7 \Question:
' C% T6 h. q3 I' U. a3 \5 g. xReports from different Testing Laboratories and clients expose essential differences in interpretation and testing practice between laboratories and/or Certification Bodies.
4 O( y4 N) T- R# mActually, the practice of one Certification Body is now being a market factor.
Based on above concerns we ask for clarification:
1 r5 n+ e1 |3 ~+ m1: Shall Cl. 19.11 be strictly followed or can solutions given under 2. be accepted.
2: Can any of the decisions (made by OSM/EE) be accepted?
: U3 Q1 J2 M$ A, ~& _- A: VDR’s across the mains are accepted if the VDR is separately certified according to IEC 61051-1 or according to CECC 42200.
- B: VDR across the mains with a protective device to guard against short-circuit is acceptable.
3 k% f7 R7 W: J. x& B0 G- C: If A and B are acceptable, should, because of the fact that VDR’s may burn or burst during life-time due to an increasing temperature stress caused by increase of leakage current with a number of switching cycles in the VDR, a thermal interrupting device on the VDR connected in series with the VDR be required.
Decision:
1. VDR’s are not short-circuited if they are used within their manufacturer’s declared specification, when tested according to Sub-clause 19.11.2 of IEC60335-1(1991).
2. VDR’s are short-circuited regardless of compliance with IEC61051-1, when tested according to Subclause 19.11.2 of IEC60335-1(2001).
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