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引用第7楼追云于2011-08-11 11:51发表的 :$ t0 q; ]) I7 F, e& p1 ^% W+ B2 t
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.
7 G1 R% ~2 `9 V1 ~) u0 q( H) ]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.
6 _$ K3 Q4 }3 k# p5 d2009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 .* `4 h; w: [# v' n Z& q
$ h) t/ ]- z9 f+ W* ~RELATED APPLICATION GUIDELINE(S): 2.5-2, 3.5-1, 3.5.2-1& f. R. @0 l$ F( s1 [8 t
5.3.8-1 Bursting fuses% C# }9 y8 Y2 O* U+ M6 f1 m3 N
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( d$ W4 ?* i' a, ~9 Y3 t8 n$ E8 YType of Issue: Technical8 c+ \; V7 ^/ e
During fault testing in the Primary circuits of switch mode power supplies (SMPS) and other ITE,
7 J4 |/ X2 n+ S+ Z& b0 l4 S3 Ysometimes a fuse that provides supplementary (non-branch circuit) overcurrent protection and
) E) q. @; `4 rthat complies with either IEC 60127 or UL 248-14 will burst while clearing the circuit
4 ^5 m6 a. F5 U/ V, G3 bIs this an acceptable result and termination of the test?8 |7 b' ]7 c/ m2 R: a3 m9 t
APPLICATION GUIDELINE: O6 o% c% k7 d$ ^" y: n' G
A fuse that bursts is not an acceptable result and termination of a test. |
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