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引用第7楼追云于2011-08-11 11:51发表的 :
* S3 x- S1 M( M# J8 ?一个作用是防止炸裂有东西飞出,另一个是绝缘作用,保险丝金属部分与周围元件之间能够满足绝缘距离要求 對於第一個作用的說法現在不成立了.2 e1 O6 j. k! g: T5 z
2009年以前 各安規機構的對於fuse 炸裂作法是現場目視工程判定,在加套管, 對於炸裂後不會產生安規危險的情況於接受.
! |+ Y r5 g: p" j% |2009年以後 因UL PAG 對Fuse 炸裂情況從新定義: 凡是fuse 炸裂情況 都判定為fail .
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RELATED APPLICATION GUIDELINE(S): 2.5-2, 3.5-1, 3.5.2-1
$ K9 @; r& \* W3 t5.3.8-1 Bursting fuses$ ~: O( C. @! B1 P( E8 |* i% L
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Type of Issue: Technical' L& z- e8 [1 |' s0 x8 {/ \- t2 `
During fault testing in the Primary circuits of switch mode power supplies (SMPS) and other ITE,9 g |3 X: z- U& X
sometimes a fuse that provides supplementary (non-branch circuit) overcurrent protection and
2 H7 ^3 Q9 e( v% l1 `: G- v) ?that complies with either IEC 60127 or UL 248-14 will burst while clearing the circuit
" M/ b, |7 {6 B1 Y5 M% N- h' tIs this an acceptable result and termination of the test?; m: j6 @3 Q* ^! ^, }
APPLICATION GUIDELINE:
+ X# S3 k' g& ]$ L4 b8 d5 EA fuse that bursts is not an acceptable result and termination of a test. |
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