DSH 568 Varistors (VDR’s) across the mains

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IEC60335试验指甲

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Varistors (VDR’s) across the mains ' K/ G1 b% j, o+ C1 u3 A5 a

19.11

60335-1(ed.4) 8 U+ Y) K8 v$ C8 L5 a. ?2 S! P$ m

) n, g7 d' w$ C3 ^" OQuestion:
4 X8 [' R  p- {9 G& C  ^Reports from different Testing Laboratories and clients expose essential differences in interpretation and testing practice between laboratories and/or Certification Bodies.
Actually, the practice of one Certification Body is now being a market factor.
* a0 B. j: a8 e" u7 d4 ?Based on above concerns we ask for clarification:
8 O0 J. a1 U/ a' a7 K9 k& O3 [8 }+ v1: 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?
+ S" X8 |) z9 Q1 {. ]3 b! 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.
, h; T) r. |! R" P  A- B: VDR across the mains with a protective device to guard against short-circuit is acceptable.
- 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.
1 T3 Y* `' o8 H0 {+ f$ ~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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