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|  DSH 4238 E% P# D: _" ?
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| Use of a PTC as a protective device
# f7 S, q! U& }7 T: H/ x' {" ~" J: [ | 57.9 b)* C& |4 i1 U( x- M" J
| 60601-1(ed.2);am1;am2
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/ Y) v N. |- ~% h; RStandard(s)- (year and edition):* p: ^5 m# Q% W" J9 W
IEC 60601-1:1988 Ed.2 Am1+Am2; U; v! \' n# _ A( Y/ Z" a
Sub clause(s): 57.9 b)
# ?+ l# ^0 g3 G! } g- D! s) R$ eSheet n°: DSH-423
; b; c: x) n* Z; j$ @; @% ]Subject: Use of a PTC as a protective device
A+ T' P, B3 |Key words: PTC, protective device, Mains supply transformers, overload
% j: n$ ~! z- a2 R) t, EConfirmed by CTL at its 39th meeting, in Cologne
3 H4 U; H$ H* c* f1 m7 b6 EQuestion:
4 t; g' [/ ~: h& z# [9 \$ vIs it permitted to use a PTC as protective device and what should be the overload test?
1 ~7 |# z0 j1 E0 d! i9 g4 k" g8 wDecision:
9 ?" J, `0 t: p1 ?Where a PTC is used as a protective device for a mains supply transformer, the requirements for/ v. B! Y. N8 Z$ @5 x2 C8 d
THERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied. ~& m5 |8 j+ ^- D7 Q
They shall be in accordance with International or National standards which address the reliability( L* a: Y/ l# A- x! o+ ?0 y0 I
of these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).
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发表于 2012-11-5 10:57
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