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|  DSH 423/ t) k ?; F2 G9 ]
% K6 Z( l+ i- o4 X2 L5 Y5 N | Use of a PTC as a protective device
F# I) ^( A, J, z( \" @ | 57.9 b)
' z, E* A Z* N4 O1 } T8 W+ M | 60601-1(ed.2);am1;am24 F' T( |+ P% ^
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Standard(s)- (year and edition):6 w- @2 p# |* _- m5 x
IEC 60601-1:1988 Ed.2 Am1+Am2
0 ], ?8 h" F6 _$ [$ A# VSub clause(s): 57.9 b) * c& v: g0 v9 K
Sheet n°: DSH-423
9 f. F) }% `1 y/ T' sSubject: Use of a PTC as a protective device$ W7 @1 D, U- Z9 I! V2 ]) Z
Key words: PTC, protective device, Mains supply transformers, overload4 L/ L9 K# P; X9 ?* ^3 T6 I B
Confirmed by CTL at its 39th meeting, in Cologne; u- C4 R8 l4 `0 M T! \
Question:
+ }' ~4 s5 N/ S1 O3 p$ N3 M5 I) xIs it permitted to use a PTC as protective device and what should be the overload test?8 d! {/ N' B5 L0 x; ~: b
Decision:
6 I1 s+ w" A6 cWhere a PTC is used as a protective device for a mains supply transformer, the requirements for
8 {* q: x8 f- v. ^" x, V* u, s- O qTHERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.6 s Y9 Y2 {3 q
They shall be in accordance with International or National standards which address the reliability
" a g3 i y0 R& mof these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).
8 [* F5 o' R% c, n% Q3 S$ A0 `9 p* e8 ?' E
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