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|  DSH 423
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* F! I& |" k/ B' W4 x# V | Use of a PTC as a protective device6 v7 A( E8 |7 I3 }2 h
| 57.9 b)
6 p' @ O( r0 r* |: j | 60601-1(ed.2);am1;am2: W! @' Z) D* z7 E4 e; B- c) G7 c
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Standard(s)- (year and edition):/ b3 a9 b; v; H5 M' u' R& A
IEC 60601-1:1988 Ed.2 Am1+Am2
: \+ ~; ]- V: ^; c9 G G- X" Q1 U3 a9 YSub clause(s): 57.9 b)
; ]' @) U+ ~% u+ K6 ~1 w2 |Sheet n°: DSH-423, r5 }8 ]' {" U( ^% _
Subject: Use of a PTC as a protective device, j! Q0 L( b! y9 @2 W0 K" Y
Key words: PTC, protective device, Mains supply transformers, overload
" @) h! y0 g3 W& o: _ T& NConfirmed by CTL at its 39th meeting, in Cologne' ]. `( o: Y' }) O
Question:8 H. |* V6 {9 i. h7 |
Is it permitted to use a PTC as protective device and what should be the overload test?
! o4 \$ E0 c# n% O9 LDecision:% U, e( y( e5 ]% j& t+ @! _
Where a PTC is used as a protective device for a mains supply transformer, the requirements for+ W+ ] i# e3 b# K: V
THERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.% ^1 z/ W8 H- l& n# S
They shall be in accordance with International or National standards which address the reliability
2 k' K8 h# Q7 U1 Aof these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).+ w! `( W- v5 ^+ D( w' n/ T
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