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引用第7楼追云于2011-08-11 11:51发表的 :7 X4 ]9 r0 i/ l) H0 x
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.
1 A- o% `0 G- o, h2009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.- h; ^4 O. Y9 R/ H# _+ c
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
. Z# o2 Y9 ~# E6 t- _$ m$ \4 _ M5.3.8-1 Bursting fuses
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Type of Issue: Technical
" e2 j. f: T, B% F2 [3 rDuring fault testing in the Primary circuits of switch mode power supplies (SMPS) and other ITE,
- Y: w( E8 _) o1 |$ S. z ksometimes a fuse that provides supplementary (non-branch circuit) overcurrent protection and) p* D& E3 Y' A/ ]
that complies with either IEC 60127 or UL 248-14 will burst while clearing the circuit- y, r+ b' m$ s% [$ }" J; T
Is this an acceptable result and termination of the test?
) ~- ^$ ~3 t- D5 M+ M5 K* r CAPPLICATION GUIDELINE:
- x9 d6 M% \. a* [4 p' VA fuse that bursts is not an acceptable result and termination of a test. |
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