DSH 568 Varistors (VDR’s) across the mains

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广东安规检测
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DSH 568 7 N) Q' Q* @; _+ X" ~& h

Varistors (VDR’s) across the mains $ z+ L* Q  `% }' I! ^" J

19.11

60335-1(ed.4) - A* \, G7 z- A2 I% @( |

Question:
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.
# o- x: x+ {" z  ?  Q4 I: c7 jBased on above concerns we ask for clarification:
1: Shall Cl. 19.11 be strictly followed or can solutions given under 2. be accepted.
! Z0 f1 g5 q9 y2: Can any of the decisions (made by OSM/EE) be accepted?
- A: VDR’s across the mains are accepted if the VDR is separately certified according to IEC 61051-1 or according to CECC 42200.
$ p# p; \: b1 j4 J- B: VDR across the mains with a protective device to guard against short-circuit is acceptable.
" {7 I2 C' I) p$ Y( ?$ {- 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).