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|  DSH 423
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| Use of a PTC as a protective device* x$ _$ d7 J& Y$ C3 O; J0 a
| 57.9 b)# A) V Y. k$ G: ~& g# W1 J0 o: g
| 60601-1(ed.2);am1;am2
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Standard(s)- (year and edition):
+ K: q' T& U: r- A$ XIEC 60601-1:1988 Ed.2 Am1+Am2
, \) z- {; u0 KSub clause(s): 57.9 b) * A% Y7 d; g# O
Sheet n°: DSH-423
9 y. X0 D$ T! W4 TSubject: Use of a PTC as a protective device& S4 |' L! k5 Y# P2 h
Key words: PTC, protective device, Mains supply transformers, overload
; j0 y1 ` g6 t+ o: q/ qConfirmed by CTL at its 39th meeting, in Cologne. P# D2 E4 K- M; [7 j7 R' N- c. O
Question:# S" ~+ R4 v G5 F9 `- Z8 H
Is it permitted to use a PTC as protective device and what should be the overload test?5 S7 K$ S/ X9 a6 G5 u% K
Decision:
" Q( D+ }6 Y% m: B& l$ T) b4 _Where a PTC is used as a protective device for a mains supply transformer, the requirements for
4 z# l, k, q4 o0 l# J: g: \! ^9 E' \THERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.( i$ ?* g+ T+ X% x" Z) P
They shall be in accordance with International or National standards which address the reliability$ ~' q' B* g5 a6 m U0 s5 {. `
of these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).9 i4 H& f" d$ a+ v
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