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以下是这个问题的专业解释.8 `- v3 ]& y; V
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5.3.8-1 Bursting fuses+ B0 G4 p3 @+ h- Q9 c
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DESCRIPTION OF ISSUE:* f B" Q4 l3 v" @" L
4 v* V: r2 [" T, WType of Issue: Technical$ b" L) c% n# r4 I" o, n9 \
& A/ [/ @: {. h4 ^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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: j m( I6 s: |; @ ?# P9 HAPPLICATION GUIDELINE:
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, D" _! t( ^; K% T% ?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 UL1 l( V9 `5 S( \- y8 M
248-14.
8 F" U3 X b) G8 c, n+ n* h" z5 V+ wPlacement 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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