DSH 423 Use of a PTC as a protective device

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DSH 423 4 O" D9 f8 d3 x& o( X

Use of a PTC as a protective device

57.9 b) ) {0 S/ p  r& ]% r; q

60601-1(ed.2);am1;am2 0 p: e" h+ y& Q: n+ F

2 u6 [: X/ C% L6 sStandard(s)- (year and edition):
6 {3 K, r7 B2 A& {. IIEC 60601-1:1988 Ed.2 Am1+Am2
& \4 ]3 c* f  nSub clause(s): 57.9 b)
  a2 L9 B! o0 WSheet n°: DSH-423
Subject: Use of a PTC as a protective device
Key words: PTC, protective device, Mains supply transformers, overload
Confirmed by CTL at its 39th meeting, in Cologne
. {9 w% X* z. `- ^9 W2 \Question:
$ v% f- v7 {. H. |( m  KIs it permitted to use a PTC as protective device and what should be the overload test?
9 T7 N9 Y) C8 [4 lDecision:
Where a PTC is used as a protective device for a mains supply transformer, the requirements for
THERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
& P( g0 p+ n+ D# }$ UThey 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).

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