DSH 568 Varistors (VDR’s) across the mains

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DSH 568 3 [5 q3 w' W2 c/ v

Varistors (VDR’s) across the mains

19.11 # w3 G  }+ s8 J& m; `( w5 G7 R

60335-1(ed.4)   [( D0 M4 v. |6 p6 u& n7 l1 U

Question:
) a4 X" s/ g+ G- K/ v9 l2 IReports 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.
3 a/ m) y: R" N( ]8 |, OBased on above concerns we ask for clarification:
1: Shall Cl. 19.11 be strictly followed or can solutions given under 2. be accepted.
8 K3 G3 }. F7 M+ {8 b& `2: Can any of the decisions (made by OSM/EE) be accepted?
" V; M0 @6 X5 q- 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.
' B; ~( Y' T, V! ^. p- 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.
. k4 _4 z8 T- J( A2 G7 ^& IDecision:
3 W4 _' H+ v0 B  d' K1. 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 D. O3 D, I1 j  O2 ~, c  x( I  w2. 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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