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标题: DSH 423 Use of a PTC as a protective device [打印本页]
作者: 小米    时间: 2012-11-5 10:57
标题: DSH 423 Use of a PTC as a protective device
DSH 423+ u* c- Z' `  |; o6 ?" @7 {

% l" s, S5 C9 |$ ]		Use of a PTC as a protective device4 J# M# I% R) [2 |/ i! S9 c0 r
57.9 b)+ A8 v' R, c) d* n
60601-1(ed.2);am1;am29 X+ Y* Y4 B& s
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Standard(s)- (year and edition):! ]$ Y' d5 D5 Q' ]: T+ D) ]9 Y
IEC 60601-1:1988 Ed.2 Am1+Am2
, q" K/ i9 x: k, }  ?+ \: q% hSub clause(s): 57.9 b)
) T+ T$ l9 g; ^* |+ ?Sheet n°: DSH-423
$ u4 C' n$ H: m1 b7 m3 t& DSubject: Use of a PTC as a protective device4 I+ M9 V6 y1 N  x1 H5 P. h; Y( ]
Key words: PTC, protective device, Mains supply transformers, overload- i2 b- _1 U/ n% b1 L4 d
Confirmed by CTL at its 39th meeting, in Cologne
# n+ f8 Y  j+ B7 f5 }! ]6 C2 G& pQuestion:) x3 o9 |) r7 v% Y' M' q/ L- A
Is it permitted to use a PTC as protective device and what should be the overload test?" ]! I$ r2 ]( T$ I$ X& e0 Q7 }
Decision:* I6 N; k1 P' B! K% ~9 r
Where a PTC is used as a protective device for a mains supply transformer, the requirements for( l: V8 A+ T% A
THERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
: v+ i0 G* I$ h7 pThey shall be in accordance with International or National standards which address the reliability4 Z! q: v, o7 [! d" C  a8 b
of these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).
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