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以下是这个问题的专业解释.( d* Q' E( c* `
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5.3.8-1 Bursting fuses2 y8 T7 \7 x0 r( C. L* n5 ?
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DESCRIPTION OF ISSUE:
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2 i7 X( G/ _- j# B4 n8 EType of Issue: Technical/ F6 t" y" ?4 T! }' i& p0 e
3 ?- @& ~' M6 u$ Y. ODuring 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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APPLICATION GUIDELINE:' M8 k! |$ ]: I5 E0 Q# g0 O! A k
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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 UL6 w) `8 h2 J: C- c6 V9 t
248-14.
5 H- [' f' b+ q) H1 KPlacement 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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