DSH 423 Use of a PTC as a protective device

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DSH 423 4 e1 y% L: R5 R; L

Use of a PTC as a protective device * n, }: q4 t. _, J

57.9 b) , a* {+ r7 E$ J: t2 e  v2 z

60601-1(ed.2);am1;am2 * X+ |) u! G# A5 v( ~

, v0 T  G5 V1 z1 hStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 57.9 b)
5 L- m+ R0 k3 s' E- ISheet n°: DSH-423
5 h, P# S! l" d4 E- o/ h" _% qSubject: Use of a PTC as a protective device
& X. I7 ?: a5 J, L' r0 e5 QKey words: PTC, protective device, Mains supply transformers, overload
8 c+ j7 t% ^# g0 \4 N# GConfirmed by CTL at its 39th meeting, in Cologne
Question:
8 u) ?/ x8 }  vIs it permitted to use a PTC as protective device and what should be the overload test?
Decision:
# Q; H; H! f+ @: N. y* @6 H. h: F) hWhere a PTC is used as a protective device for a mains supply transformer, the requirements for
0 a/ d/ ?3 E( t! @5 j; ~! S! F4 J( kTHERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
& L) D5 K$ w% ~/ q( x# xThey shall be in accordance with International or National standards which address the reliability
: |, x) Y7 f1 R, \1 \7 zof these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).