DSH 423 Use of a PTC as a protective device
http://decisions.iecee.org/icons/ecblank.gif DSH 423
Use of a PTC as a protective device
57.9 b)
60601-1(ed.2);am1;am2
Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
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
Question:
Is it permitted to use a PTC as protective device and what should be the overload test?
Decision:
Where a PTC is used as a protective device for a mains supply transformer, the requirements for
THERMAL 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
of these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).
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