DSH 423 Use of a PTC as a protective device

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DSH 423 + q$ S) j8 R* n+ h7 }

Use of a PTC as a protective device

57.9 b)

60601-1(ed.2);am1;am2

- G: F* R. ^' t9 j* E2 SStandard(s)- (year and edition):
* [3 v4 J- U% K6 d$ e4 e) KIEC 60601-1:1988 Ed.2 Am1+Am2
4 G5 |, N) h: k1 g! ?Sub clause(s): 57.9 b)
Sheet n°: DSH-423
Subject: Use of a PTC as a protective device
Key words: PTC, protective device, Mains supply transformers, overload
Confirmed by CTL at its 39th meeting, in Cologne
6 \4 i$ V7 K8 K0 f6 ^, a; nQuestion:
" k9 w: a+ X, {! AIs it permitted to use a PTC as protective device and what should be the overload test?
Decision:
7 N' R) I; n3 \, K3 AWhere a PTC is used as a protective device for a mains supply transformer, the requirements for
; A$ e$ m" C' e2 ~4 |, mTHERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
They shall be in accordance with International or National standards which address the reliability
3 K' ?4 y+ }$ Y" g; {/ vof these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).
6 K) {. ]+ T+ j