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引用第7楼追云于2011-08-11 11:51发表的 :
% ~+ z) h1 C5 v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 \/ ]9 V F6 g/ o* m; Q$ Y7 `' T2009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.
4 |/ E7 h0 s2 S# s( [% a' S2009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* @1 V3 f$ x( W" k! }( U
5.3.8-1 Bursting fuses
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9 x/ _! B, N+ h m2 u( u5 i5 J+ nType of Issue: Technical+ ?( e) r* \) J$ r+ O
During fault testing in the Primary circuits of switch mode power supplies (SMPS) and other ITE,
; H6 r& t0 t$ b' Zsometimes a fuse that provides supplementary (non-branch circuit) overcurrent protection and$ N! K9 U, B/ n9 u- _6 o
that complies with either IEC 60127 or UL 248-14 will burst while clearing the circuit
% Y# v4 m5 B, RIs this an acceptable result and termination of the test?
2 E$ X7 W5 e2 I, gAPPLICATION GUIDELINE:) I4 T4 U. |0 v' g \
A fuse that bursts is not an acceptable result and termination of a test. |
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