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PULSE
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Pulse produces thermal cycling and mechanic fatigue which could affect the life of fuse. In design the selected fuse should have a I2T value much greater than the I2T value of pulse. Refer to TABLE A showing the relationship between the life of fuse (the endurable times of pulse shock.) and U ( ratio between pulse I2T value and fuse I2T value ).The I2T value of a fuse presented in this catalog may be for your reference. The I2T value of a pulse can be approximated from the following formulas for a typical wave shape, refer to TABLE B.
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Endurable times of pulse shock |
U( ratio) |
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100,000 times |
20% |
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10,000 times |
30% |
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1,000 times |
40% |
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Note: Adequate interval (5s-10s) must exist between pulse events to allow the heat from the previous event to dissipate
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TESTING |
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The selected sample should be tested in the actual circuit to verify the selection .The testing should be include the tests under normal and fault conditions to ensure that the fuse will operate properly in the circuit.
In all kinds of electrical protection doubts, contacting our engineers are welcome Possibly we will work with you making some special recommendations to help you solve these problems.
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