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以下是这个问题的专业解释.1 p% _2 i v' _
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5.3.8-1 Bursting fuses* D9 G; ^+ q* f8 |& T4 B5 `
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DESCRIPTION OF ISSUE:+ L) y# U7 M- e r! A- [
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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?( B' W/ a8 A; f/ b4 L& h
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APPLICATION GUIDELINE:$ L$ [0 x( R& i4 }) X! P1 P
* q# @# _3 ?/ x: i" Y4 R. b" JA 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. `' g, j3 B& i* X$ K# v+ Y
248-14.
, [1 N+ C P2 H" GPlacement 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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