DSH 423 Use of a PTC as a protective device

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DSH 423 4 s( g& q; L. J9 N. E6 I8 V

Use of a PTC as a protective device : E, q  t2 l9 e6 v5 z& v3 s

57.9 b) ) [1 X& r$ d& Y* q7 W$ \6 x, s

60601-1(ed.2);am1;am2 / C: C2 Q0 h$ }( K7 [

Standard(s)- (year and edition):
& M. G, |- ?. o& `IEC 60601-1:1988 Ed.2 Am1+Am2
$ |! u+ m9 V& F# A2 c3 ?2 X/ S9 A3 cSub clause(s): 57.9 b)
. w4 i& p  G* V! c! ISheet n°: DSH-423
Subject: Use of a PTC as a protective device
3 N/ k  b3 b8 ]) N- E' t1 @Key words: PTC, protective device, Mains supply transformers, overload
* D. r: b* v) w& LConfirmed by CTL at its 39th meeting, in Cologne
* U+ u- f- _4 I  ?; Y& S. aQuestion:
4 l$ [; L3 B$ I3 uIs it permitted to use a PTC as protective device and what should be the overload test?
3 B) v3 s- B( o3 }7 Z: HDecision:
2 V/ M0 [9 ]. t+ E- R. z/ fWhere a PTC is used as a protective device for a mains supply transformer, the requirements for
8 |) Z1 T7 f! B3 x" g1 T' dTHERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
) Z6 n9 ^8 l$ g8 t) U: FThey shall be in accordance with International or National standards which address the reliability
of these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).