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|  DSH 423
& b) o; s7 j/ m& z5 }4 j- X4 v& }. I5 a+ \5 v& X: C5 i, {
| Use of a PTC as a protective device& ]7 g/ Y9 |3 u* e8 x7 j: N
| 57.9 b)/ a: ?* L' ]5 m4 v) |
| 60601-1(ed.2);am1;am2
5 C B. Y8 @. I) _" r! s |
) k% H+ d9 [6 j' {0 f+ s, X/ M! RStandard(s)- (year and edition):5 M9 G: s' ~% {. C9 l' z
IEC 60601-1:1988 Ed.2 Am1+Am2, B5 q9 w% W4 b! R& L# N. J6 l# R
Sub clause(s): 57.9 b) 3 N7 e1 f) o( \7 g* M( A4 Y( s9 L! J6 T
Sheet n°: DSH-423. z9 f1 f; c ?; L( L% [4 ~1 {5 X/ ?
Subject: Use of a PTC as a protective device1 z5 n2 i5 D5 a' e
Key words: PTC, protective device, Mains supply transformers, overload
- w* K" \4 _: O8 f) H' uConfirmed by CTL at its 39th meeting, in Cologne7 S4 E4 Y7 J3 m7 L6 k
Question:
4 e$ [0 j* a$ n( z3 [8 F& b) ~Is it permitted to use a PTC as protective device and what should be the overload test?) f0 {+ i3 M/ @
Decision:' A1 N! e! q h3 O% ]
Where a PTC is used as a protective device for a mains supply transformer, the requirements for4 B$ t4 p( \& w) V
THERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
; y$ U9 Y+ ~8 V8 @& kThey shall be in accordance with International or National standards which address the reliability- U" _: s4 h4 r5 l( w" K
of these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).: S9 M' J& W+ P y- M& H8 [5 j
$ l1 M5 B9 Q6 o& W1 L |
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