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以下是这个问题的专业解释.$ v( e, K7 A3 v: B
7 H; g, p: \! k) c; e5 o# E- T5.3.8-1 Bursting fuses
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DESCRIPTION OF ISSUE:5 d1 ?8 ~" x! i, q' N% ~
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Type of Issue: Technical8 \" X- T+ d0 `3 \
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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?) m& C* ]8 ^) E. r
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APPLICATION GUIDELINE:2 f( Q. E* X* |( z( |8 _
1 f7 E/ Z% v+ Z4 k2 n" DA 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& v; Q+ ~' L+ T6 q, \7 q
248-14.- K( e4 f* m$ N3 Z, e$ d2 }2 Y, g
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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