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|  DSH 4234 E0 G, g1 q" U- E, A4 H- l
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| Use of a PTC as a protective device
! ^" g- d7 I4 i | 57.9 b)
: D; B. z. D/ U | 60601-1(ed.2);am1;am2
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Standard(s)- (year and edition):
! i2 r) K5 P; i) mIEC 60601-1:1988 Ed.2 Am1+Am2
2 t, m' s4 u5 H; H7 e" U+ RSub clause(s): 57.9 b)
/ s9 i1 @' R: B" l* I7 n. N, ?" }Sheet n°: DSH-4236 l3 _$ r; g. G* H/ W
Subject: Use of a PTC as a protective device
, D. C) [" x M% F8 h2 pKey words: PTC, protective device, Mains supply transformers, overload) M: x0 u; p& e! Q# L) K9 I
Confirmed by CTL at its 39th meeting, in Cologne( u O6 K1 I# E
Question:
( s6 T1 m) }( A0 \% r* GIs it permitted to use a PTC as protective device and what should be the overload test?
3 p/ T2 \- a8 PDecision:
9 O7 v( |( b h& sWhere a PTC is used as a protective device for a mains supply transformer, the requirements for
. u* _9 p @5 p* ]THERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
$ m" `: [& F& q( nThey shall be in accordance with International or National standards which address the reliability
( @+ S5 ^, L# Z8 s oof these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).
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