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|  DSH 4239 [, P. B9 K2 |% ~" C0 z8 }
/ z9 H8 s, X/ \* r H; b0 D; q | Use of a PTC as a protective device
( J) Y# m; H% t3 g5 R2 i | 57.9 b)5 w' i# B8 V/ d8 P& q' L; L7 l# [
| 60601-1(ed.2);am1;am2- m+ c H8 o" N4 b" W
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: M. c4 [1 R i w" A nStandard(s)- (year and edition):+ A# o; P& G7 w
IEC 60601-1:1988 Ed.2 Am1+Am2% S$ _* @2 P4 x
Sub clause(s): 57.9 b)
' Z2 u4 U4 w# D# \Sheet n°: DSH-423
( l8 a# I; b0 E8 R" j+ _( MSubject: Use of a PTC as a protective device5 F) i* o2 ^+ _0 c) k( C1 ^
Key words: PTC, protective device, Mains supply transformers, overload3 K. z. _" \: l7 m! P; H" T( X
Confirmed by CTL at its 39th meeting, in Cologne7 {3 ]1 r8 s$ ^; Z" k
Question:' I" v1 N% b- g9 q% Z/ @ h/ D# ^
Is it permitted to use a PTC as protective device and what should be the overload test?
% B+ ]8 [# \$ e% I) FDecision:9 f* Q2 }! \$ y0 J8 W
Where a PTC is used as a protective device for a mains supply transformer, the requirements for. L w$ ]; h: i S. y
THERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
* Y) y% v; |& {They shall be in accordance with International or National standards which address the reliability: V8 O, T( [ o u% f
of these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).
# u* I; p. ^% |& x/ u3 _
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