DSH 423 Use of a PTC as a protective device

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DSH 423 & ?- @8 R  a  G: s* M4 ]

Use of a PTC as a protective device

57.9 b) ( S2 _8 c. }, A$ Z

60601-1(ed.2);am1;am2

3 m. @) s: s$ _' N7 Y5 I4 e0 S) SStandard(s)- (year and edition):
: d5 X! R9 v+ D6 c& Q* q0 S! j, N1 UIEC 60601-1:1988 Ed.2 Am1+Am2
% H8 Q8 i! Z7 e: lSub clause(s): 57.9 b)
. n1 s  v. v8 |' w3 SSheet n°: DSH-423
Subject: Use of a PTC as a protective device
) e0 d! m' M- S$ r" EKey words: PTC, protective device, Mains supply transformers, overload
8 x0 I: I* t- T' E. L4 AConfirmed by CTL at its 39th meeting, in Cologne
Question:
Is it permitted to use a PTC as protective device and what should be the overload test?
. ~( I* c9 f! o4 v: p$ jDecision:
  y, Y4 E0 h/ D) R* Q0 N- yWhere a PTC is used as a protective device for a mains supply transformer, the requirements for
& C1 K/ h" @: L0 f/ [+ m7 G; sTHERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
9 v9 ^+ E. ~/ u, F: YThey shall be in accordance with International or National standards which address the reliability
5 Z/ F/ X$ a, y& T3 L* yof these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).