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以下是这个问题的专业解释.$ P4 z% U5 ~+ C. ]( ^# W
3 Y1 ^# B9 _0 S0 I p5.3.8-1 Bursting fuses
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. } F7 g. o# ^. F( G% S* \; J2 P# eDESCRIPTION OF ISSUE:1 H6 p+ \2 p$ H: }5 {
2 @6 E5 T/ c. F# ^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$ ]" s8 @ z
. u! l. L1 |. k' ?APPLICATION GUIDELINE:) a ~- U! V, G n% b: p' ]; N9 |
% S7 u5 l5 |+ k' c+ MA 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
6 n) J) Q5 e7 P248-14.
% F( S; N9 ~2 `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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