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Key points of fuse selection

Key points of fuse selection

  • Categories:Company News
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  • Time of issue:2020-07-15
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(Summary description)Key points of fuse selection

 

I believe we all have a headache in choosing fuses because there is no good guidance,

The following is a list of the factors involved in fuse selection,

You can choose the most suitable fuse according to these ideas.

 

1. Normal working current: the reliable working current of fuse is usually 75% of rated current at 25C to avoid failure. For example: in 25C environment, it is not recommended to use fuse with rated current of 10a to work above 7.5A.

2. Application voltage (AC or DC): the rated voltage of the fuse must be equal to or greater than the voltage of the applied circuit.

3. Ambient temperature: the higher the ambient temperature, the hotter the fuse works and the shorter the service life. On the contrary, working at a lower temperature will prolong the service life of the fuse. The fuse is also hotter when the normal operating current approaches or exceeds its rated value.

4. Overload current: it defines the current that the circuit needs to be protected in case of a fault. The fault condition can be current or current and the maximum fault time that can be sustained before damage occurs. In the matching of fuses and circuits, the time current curve should be considered, but remember that the curve is based on average data.

5. Maximum fault current: the fuse rating must meet or exceed the maximum fault current of the circuit.

6. Pulse (current mutation, surge current, start-up current and circuit transients): electrical pulse conditions may vary greatly in different applications. Different fuse configurations may not respond the same to a given pulse condition. Thermal cycling and possible mechanical fatigue caused by electrical pulses can affect the service life of fuses. The initial pulse or starting pulse is normal for some applications where the fuse is to be selected with a thermal delay design to maintain the normal start pulse and still provide protection in the event of prolonged overload. We should refer to and compare the time current curve and i2t rating of the fuse for the selection of the fuse which should respond to the starting pulse.

7. Physical size limits: refer to the manufacturer's data book for fuse length, diameter and height information.

8. Agency approval required: refer to the manufacturer's data book for information on Agency approval for a specific device, such as UL, CSA, VDE, METI, or MITI. Military requirements need special consideration.

9. Fuse characteristics: refer to the manufacturer's data book for installation type / overall dimensions, ease of disassembly, axial leads, visual indications, etc.

10. Fuse holder characteristics and reassessment: refer to the manufacturer's data book for information on clips, mounting blocks, panel mounting, PCB mounting, RFI shielding, etc.

11. Pre production application testing and validation: verify the selection by requesting samples to be tested in the actual circuit. Before evaluating the sample, make sure that the fuse has a good electrical connection and that the cable connection used is appropriate. The test shall include a life test under normal conditions and an overload test under fault conditions to ensure that the fuse works properly in the circuit. The above are the key points of fuse selection,

Key points of fuse selection

(Summary description)Key points of fuse selection

 

I believe we all have a headache in choosing fuses because there is no good guidance,

The following is a list of the factors involved in fuse selection,

You can choose the most suitable fuse according to these ideas.

 

1. Normal working current: the reliable working current of fuse is usually 75% of rated current at 25C to avoid failure. For example: in 25C environment, it is not recommended to use fuse with rated current of 10a to work above 7.5A.

2. Application voltage (AC or DC): the rated voltage of the fuse must be equal to or greater than the voltage of the applied circuit.

3. Ambient temperature: the higher the ambient temperature, the hotter the fuse works and the shorter the service life. On the contrary, working at a lower temperature will prolong the service life of the fuse. The fuse is also hotter when the normal operating current approaches or exceeds its rated value.

4. Overload current: it defines the current that the circuit needs to be protected in case of a fault. The fault condition can be current or current and the maximum fault time that can be sustained before damage occurs. In the matching of fuses and circuits, the time current curve should be considered, but remember that the curve is based on average data.

5. Maximum fault current: the fuse rating must meet or exceed the maximum fault current of the circuit.

6. Pulse (current mutation, surge current, start-up current and circuit transients): electrical pulse conditions may vary greatly in different applications. Different fuse configurations may not respond the same to a given pulse condition. Thermal cycling and possible mechanical fatigue caused by electrical pulses can affect the service life of fuses. The initial pulse or starting pulse is normal for some applications where the fuse is to be selected with a thermal delay design to maintain the normal start pulse and still provide protection in the event of prolonged overload. We should refer to and compare the time current curve and i2t rating of the fuse for the selection of the fuse which should respond to the starting pulse.

7. Physical size limits: refer to the manufacturer's data book for fuse length, diameter and height information.

8. Agency approval required: refer to the manufacturer's data book for information on Agency approval for a specific device, such as UL, CSA, VDE, METI, or MITI. Military requirements need special consideration.

9. Fuse characteristics: refer to the manufacturer's data book for installation type / overall dimensions, ease of disassembly, axial leads, visual indications, etc.

10. Fuse holder characteristics and reassessment: refer to the manufacturer's data book for information on clips, mounting blocks, panel mounting, PCB mounting, RFI shielding, etc.

11. Pre production application testing and validation: verify the selection by requesting samples to be tested in the actual circuit. Before evaluating the sample, make sure that the fuse has a good electrical connection and that the cable connection used is appropriate. The test shall include a life test under normal conditions and an overload test under fault conditions to ensure that the fuse works properly in the circuit. The above are the key points of fuse selection,

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2020-07-15
  • Views:0
Information

Key points of fuse selection

 

I believe we all have a headache in choosing fuses because there is no good guidance,

The following is a list of the factors involved in fuse selection,

You can choose the most suitable fuse according to these ideas.

 

1. Normal working current: the reliable working current of fuse is usually 75% of rated current at 25C to avoid failure. For example: in 25C environment, it is not recommended to use fuse with rated current of 10a to work above 7.5A.

2. Application voltage (AC or DC): the rated voltage of the fuse must be equal to or greater than the voltage of the applied circuit.

3. Ambient temperature: the higher the ambient temperature, the hotter the fuse works and the shorter the service life. On the contrary, working at a lower temperature will prolong the service life of the fuse. The fuse is also hotter when the normal operating current approaches or exceeds its rated value.

4. Overload current: it defines the current that the circuit needs to be protected in case of a fault. The fault condition can be current or current and the maximum fault time that can be sustained before damage occurs. In the matching of fuses and circuits, the time current curve should be considered, but remember that the curve is based on average data.

5. Maximum fault current: the fuse rating must meet or exceed the maximum fault current of the circuit.

6. Pulse (current mutation, surge current, start-up current and circuit transients): electrical pulse conditions may vary greatly in different applications. Different fuse configurations may not respond the same to a given pulse condition. Thermal cycling and possible mechanical fatigue caused by electrical pulses can affect the service life of fuses. The initial pulse or starting pulse is normal for some applications where the fuse is to be selected with a thermal delay design to maintain the normal start pulse and still provide protection in the event of prolonged overload. We should refer to and compare the time current curve and i2t rating of the fuse for the selection of the fuse which should respond to the starting pulse.

7. Physical size limits: refer to the manufacturer's data book for fuse length, diameter and height information.

8. Agency approval required: refer to the manufacturer's data book for information on Agency approval for a specific device, such as UL, CSA, VDE, METI, or MITI. Military requirements need special consideration.

9. Fuse characteristics: refer to the manufacturer's data book for installation type / overall dimensions, ease of disassembly, axial leads, visual indications, etc.

10. Fuse holder characteristics and reassessment: refer to the manufacturer's data book for information on clips, mounting blocks, panel mounting, PCB mounting, RFI shielding, etc.

11. Pre production application testing and validation: verify the selection by requesting samples to be tested in the actual circuit. Before evaluating the sample, make sure that the fuse has a good electrical connection and that the cable connection used is appropriate. The test shall include a life test under normal conditions and an overload test under fault conditions to ensure that the fuse works properly in the circuit. The above are the key points of fuse selection,

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