|
|
以下是这个问题的专业解释.( Z, o$ M5 f* @( `- \# D
3 R+ t. w3 i8 Y
5.3.8-1 Bursting fuses( N' x* v: x& K
$ Q7 [, s) u+ `; g( p2 iDESCRIPTION OF ISSUE:3 x. m0 @- a, F, O; o+ B
# l9 u- G3 J6 PType of Issue: Technical
' p+ r$ S4 H) {6 n6 {* O0 |) [; e1 ^" T* A
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?( R5 R0 f( z7 N G6 J. ?
% z1 X' x& @/ m. c Y: L
APPLICATION GUIDELINE:8 z* J, d: U4 l( }7 W% ]
( F: z! U+ C1 g$ B# XA 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$ e$ ? N$ x) E: \0 |, l) `/ H
248-14.
' ?3 m1 L$ y& K6 l: p& d. O; RPlacement 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. |
|