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以下是这个问题的专业解释.% F9 |* q3 T8 N- P' K: h
7 U$ w2 C2 G# ]( t# {. r x8 y* B5.3.8-1 Bursting fuses
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DESCRIPTION OF ISSUE:
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8 P0 _% j. b# a0 Y7 {Type of Issue: Technical4 {+ s$ ^+ q& ~+ t2 k1 ^6 T# q
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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?- O4 k9 j; O2 p. o$ E3 J$ Z
! w9 W4 k4 x1 `APPLICATION GUIDELINE:
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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 UL" o" R; y7 {( n% ~ r+ b
248-14.4 O2 w9 g! @1 J# X, V
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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发表于 2011-8-18 20:13
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