DSH 568 Varistors (VDR’s) across the mains

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广东安规检测
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DSH 568 ' U" [$ ]  v6 a6 [ * R, _: A3 F  w! B

Varistors (VDR’s) across the mains

19.11

60335-1(ed.4)

Question:
8 [  z  }' Q0 iReports from different Testing Laboratories and clients expose essential differences in interpretation and testing practice between laboratories and/or Certification Bodies.
/ D) n$ Z' A0 W+ w) l* |" RActually, the practice of one Certification Body is now being a market factor.
Based on above concerns we ask for clarification:
1: Shall Cl. 19.11 be strictly followed or can solutions given under 2. be accepted.
4 c! u  i& \, e+ P' n1 T- f2: Can any of the decisions (made by OSM/EE) be accepted?
1 W0 B2 ?% }* g3 P: G- 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.
- U* h9 ~. s- |- 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 \0 [) q% p3 O. ]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).
) r7 O6 M7 |+ g2. VDR’s are short-circuited regardless of compliance with IEC61051-1, when tested according to Subclause 19.11.2 of IEC60335-1(2001).