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引用第7楼追云于2011-08-11 11:51发表的 :
" \% U: J6 l7 Y& `1 D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.
9 q' a. Z w+ a9 f# V. |. B2009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.0 X! m+ p6 m+ }1 H+ l. F' i, q9 w
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 y5 S; \; B& |# \
5.3.8-1 Bursting fuses
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Type of Issue: Technical
2 B2 T- g, N( H8 cDuring fault testing in the Primary circuits of switch mode power supplies (SMPS) and other ITE,
6 Q' l' [' J; i. ysometimes a fuse that provides supplementary (non-branch circuit) overcurrent protection and9 u& y g& W- d7 G8 s
that complies with either IEC 60127 or UL 248-14 will burst while clearing the circuit
. V0 ~+ x9 T: q9 H/ pIs this an acceptable result and termination of the test?% O4 p7 G$ Y( |. b
APPLICATION GUIDELINE:* ]5 ?6 u. e) S% ]
A fuse that bursts is not an acceptable result and termination of a test. |
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