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以下是这个问题的专业解释.
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5.3.8-1 Bursting fuses
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7 A& U5 r( g3 g2 BDESCRIPTION OF ISSUE:
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9 r1 d* S n. ^7 U, r: QType of Issue: Technical" e% `5 R5 K% l
: O: w& L; E! B. i$ m' \6 D9 BDuring 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?5 ]5 d U/ k2 c) {
4 q6 m/ [- |* T6 Y9 D% \APPLICATION GUIDELINE:
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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 UL
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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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