DSH 423 Use of a PTC as a protective device

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DSH 423 9 r  i( Z* N, H+ ]

Use of a PTC as a protective device   z" F- i  F: U+ a9 f' Y

57.9 b) ! W5 x4 K! X* ^, H( V: X0 e

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

0 N  V9 z2 z' X- \6 bStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
0 z2 t' ]7 H3 [; ]3 FSub clause(s): 57.9 b)
Sheet n°: DSH-423
9 M; A0 Z7 N" ESubject: Use of a PTC as a protective device
Key words: PTC, protective device, Mains supply transformers, overload
* U1 Q: n7 j- P" c# E; o1 `- _Confirmed by CTL at its 39th meeting, in Cologne
8 R  s$ F4 A6 wQuestion:
Is it permitted to use a PTC as protective device and what should be the overload test?
0 L( k% h" w, n  h6 g: x( e" rDecision:
& s' a" T4 A3 v6 d- w+ c+ vWhere a PTC is used as a protective device for a mains supply transformer, the requirements for
6 G/ }  a: i4 a8 z9 o* z  @0 nTHERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
They 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).
/ {# A6 ?/ R$ s) ~! e" S# u1 a! o