DSH 423 Use of a PTC as a protective device

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 423 9 s  s  |5 D" w9 \  q1 K

Use of a PTC as a protective device

57.9 b) 1 Y  H# V, n# ]2 X9 j/ z& I

60601-1(ed.2);am1;am2 . C1 G2 U" g/ t3 V5 K) v$ u/ p

! @( k! U  u) k- S+ _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
) A" [* {3 d3 P' r$ RKey words: PTC, protective device, Mains supply transformers, overload
) |: S- z7 f9 fConfirmed 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?
4 ^2 p2 S2 K/ i( }4 O  YDecision:
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).

  h% }& i" `, {% T7 G