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 " F2 m* `6 I2 D! r2 X

Use of a PTC as a protective device / W& d. e7 ~9 V; p* X7 v

57.9 b)

60601-1(ed.2);am1;am2

. ~) w) x* p  ]) v4 NStandard(s)- (year and edition):
  \) _. V: g: ]% o; A# v/ l  e) }IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 57.9 b)
Sheet n°: DSH-423
8 r% `( {/ w0 k/ [' X- I* OSubject: Use of a PTC as a protective device
# e& \. Y) h4 ]1 x9 W9 _Key words: PTC, protective device, Mains supply transformers, overload
4 R, e( z9 S# i: `- O& [Confirmed by CTL at its 39th meeting, in Cologne
8 G# g' D+ M3 HQuestion:
. c( Z: M$ ~2 j% NIs it permitted to use a PTC as protective device and what should be the overload test?
' h; E; `+ l+ {! v% Z* g0 ~! d1 ^+ D, ADecision:
Where a PTC is used as a protective device for a mains supply transformer, the requirements for
6 |3 j! a0 @8 @: i1 }0 }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).
6 x& M5 \/ |, ?1 s
0 s8 g: h1 s5 J9 U