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以下是这个问题的专业解释.5 O; ^% Z7 M* |& {0 j) J* {
- g1 e1 @! e$ b, b, d! u5.3.8-1 Bursting fuses; [( S4 _( i9 B& C% T" Y! K7 Q
" }$ \3 r X$ M2 f6 X: yDESCRIPTION OF ISSUE:1 \% K1 v& v9 ]5 I2 }/ o) z4 G- ~0 s
; @6 {5 s, e8 b5 R: b' @# Q4 |6 {1 oType of Issue: Technical! z" F" B6 [; _' K$ p8 z- i
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During fault testing in the Primary circuits of switch mode power supplies (SMPS) and other ITE, sometimes a fuse that provides supplementary (non-branch circuit) overcurrent protection and that complies with either IEC 60127 or UL 248-14 will burst while clearing the circuit Is this an acceptable result and termination of the test?
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APPLICATION GUIDELINE:4 b( r, Y, T2 z1 V3 E% Z. Z
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A fuse that bursts is not an acceptable result and termination of a test. If a fuse bursts during fault testing per sub-clause 5.3, it does not have adequate breaking (rupturing) capacity. Therefore, such a fuse should be replaced by the manufacturer with another fuse having high breaking capacity. This consideration applies to fuses complying with both IEC 60127 and UL7 u; |& {$ Y. C* L# @
248-14.8 i5 a3 R6 z. \9 k+ x- W
Placement of heat shrink or similar tubing over the fuse assembly is not a suitable solution to wholly mitigate potential hazards associated with a bursting fuse. |
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发表于 2011-8-18 20:13
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