DSH 423 Use of a PTC as a protective device

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DSH 423

Use of a PTC as a protective device

57.9 b) 9 e: U+ {' e" x" J

60601-1(ed.2);am1;am2 0 s( C/ ^4 p& v& Y

( d8 b: d8 j" {3 x1 m+ T& JStandard(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:
( H& ]; O, w+ \% `; r+ B; fIs it permitted to use a PTC as protective device and what should be the overload test?
9 d: c4 E5 o- O- m8 bDecision:
Where a PTC is used as a protective device for a mains supply transformer, the requirements for
. l, H! g0 v% _THERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
& d8 d1 Y$ B1 e+ Z- B+ F7 A( bThey shall be in accordance with International or National standards which address the reliability
2 [; R+ x4 O; }2 L) _& g6 D8 jof these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).