DSH 756 Verification of the main contact position on multipole circuit-breakers

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 756 2 W0 i8 ?. _% ?

Verification of the main contact position on multipole circuit-breakers ; Z7 W( {1 v1 v

7.1.7.1 and 8.2.5 (60947-1) 8.3.3.9 (60947-2)

60947-1(ed.5) & 60947-2(ed.4)

Standard(s):
IEC 60947-1 (2007-06, 5th Ed.)
IEC 60947-2 (2006-04, 4th Ed.)
) @! s+ o; p/ d) p* ODSH
" m/ x" O/ G  `4 y" ^4 {. N0756
2010
$ d& y: Q7 l4 d  QCategory: POW
Subclause(s):
, s; b  Q- J) r2 \4 [' }: L7.1.7.1 and 8.2.5 (60947-1)
8.3.3.9 (60947-2)
Developed by: CTL-ETF7
Subject:
Verification of the main contact position on multipole circuit-breakers
% A/ d& Q7 R/ D' ?5 q# wKey words:
- multipole
3 U% F9 K4 L: ~- E- circuit-breakers
1 `/ r+ d" w$ S- neutral pole
Approved at the 47th CTL Plenary Meeting in 2010
Question:
Can the Neutral pole be excluded from the verification of main contact position?
) R! V! x+ b9 T  H/ K9 [What is considered “resting in the closed position” for actuators consisting of a number of mechanically interlinked partial actuators of single-pole-units mounted together?
Rationale:
The IEC 60947 standard makes no difference between the main contacts of the phase poles and of the N pole.
$ Y( y9 m& {3 y) q& Y: Z, ?According to clause 7.1.7.1 of the IEC 60947-1, the indication of the position of the main contacts shall be verified.
4 W2 H) s. b- W; ?) M* c- J0 kIEC 60947-1, Clause 8.2.5: reads: “With the equipment in the closed position, the fixed and moving contacts of the pole for which the test is deemed to be the most severe shall be fixed together, for example, by welding”.
Decision:
In case of a multi-pole circuit breaker, the term “main breaker contacts” addresses the phase contacts and the N pole contact. The verification test of 8.3.3.9 shall be conducted on the pole for which the test is deemed to be most severe. Depending on the construction of the breaker this can be the Neutral pole.
If the position of the actuator is the only indication of the contact position and this actuator consists of a number of mechanically interlinked partial actuators of single-pole-units, the whole actuator shall clearly rest in the closed position.

. T& c' a+ |2 K  t