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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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3 h8 P I$ o! {% s3 @1 V% H: O) NDESCRIPTION OF ISSUE:. F6 F! G7 u/ [
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Type of Issue: Technical m/ A3 l/ a+ K, D8 w8 }0 H
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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?- s) h1 }/ q5 [/ c/ u2 J" Q
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APPLICATION GUIDELINE:7 {: j6 U6 l( d+ [
4 Q9 Q% Y- x! VA 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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: z& y* b" k" C% [ W6 n; I7 W. _6 W8 MPlacement 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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