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以下是这个问题的专业解释.: A7 J1 C* A7 ^) T1 B5 f
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5.3.8-1 Bursting fuses4 ?; i5 b4 F# d. h2 G
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DESCRIPTION OF ISSUE:
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Type of Issue: Technical0 @5 p9 _! U7 g' R& p/ _% J# u
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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?
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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 UL7 m4 R* F% z; B8 y3 }
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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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