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以下是这个问题的专业解释.
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Q. z- w7 u# v5.3.8-1 Bursting fuses8 h& P% e( R; U' {* ?
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DESCRIPTION OF ISSUE:
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Type of Issue: Technical
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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?0 b' Y6 D0 r+ Q \. Y4 J$ @0 o
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APPLICATION GUIDELINE:
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, U; n, _( ]% q: P2 S6 kA 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 UL3 y4 \& ^ a% ~
248-14.
- f v, G& I! M2 t% u. P" _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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