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|  DSH 423 U: H- i9 { y* `$ d0 N
; i: r! n& r p% r | Use of a PTC as a protective device' c% V% C: w. {5 i! e+ ] T7 z
| 57.9 b)
$ q# P$ F8 U: m' s | 60601-1(ed.2);am1;am23 S5 W7 Z% `- u6 T" ~: B: _
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Standard(s)- (year and edition):
& x2 ]/ ]; D# e. {IEC 60601-1:1988 Ed.2 Am1+Am2
; c$ I D4 r7 F1 dSub clause(s): 57.9 b)
% U; t+ J+ f) i- u/ zSheet n°: DSH-423
" C6 T& t; k$ P" c" X' aSubject: Use of a PTC as a protective device
; q7 s4 L7 h& e* {- n; e2 z) bKey words: PTC, protective device, Mains supply transformers, overload# ~1 y) p0 D% \7 M! O8 _
Confirmed by CTL at its 39th meeting, in Cologne; L$ E' ^, d3 _ [
Question:- x! R# `& `* P k6 |
Is it permitted to use a PTC as protective device and what should be the overload test?9 N* ~5 t" {/ ]2 D8 J
Decision:
* @* A2 N! |% J3 E- U1 CWhere a PTC is used as a protective device for a mains supply transformer, the requirements for
/ A: ^. f/ ^: }' @+ i7 [2 TTHERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
8 F4 @5 Y' J4 V# I" }/ WThey shall be in accordance with International or National standards which address the reliability
" J( ~+ }5 d' a; f' Q& @. Yof 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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