New industry Technology regarding to Bussmann fuse, ABB breakers, Amphenol connectors, HPS transformers, etc.
Time delay fuse cross reference: KLDR004, FNQ-R-4, ATQR4
When we select the time delay fuse to a EV charger customer.
Proposal PN1： Littelfuse， KLDR004
Proposal PN2： Bussmann，FNQ-R-4
Proposal PN3： Mersen，ATQR4
Applications: • Branch circuits • Line protection • Small control transformers • Industrial control
What are the factors we need to consider when choose fuse and fuse cross reference?
1, System current
Suppose the system current is around 2.5~3A, Normally we will consider at least 1.6 times of system current in standard circuit( No big starting current)
So to choose 4A, these 3 time delay fuse models are all OK .
2, Check the 2.5In Time current curve
Littelfuse， KLDR004 | Bussmann，FNQ-R-4 | Mersen，ATQR4 |
|
|
|
Melt at 20S when input current is 10A | Melt at 11S when input current is 10A | Melt at 16S when input current is 10A |
3, Peak Let thorugh Curve
Littelfuse， KLDR004 | Bussmann，FNQ-R-4 | Mersen，ATQR4 |
|
|
|
4, Temperature Derating Curve (Temperature of Air Immediately Surrounding Fuse)
Fuse normal working tempeture: -20C ~40C. If your system tempeture is not in this range, you will need to consider to increase or decrease fuse current to meet the surrounding.
5, Check the 10In Time current curve ( Optional)
Littelfuse， KLDR004 | Bussmann，FNQ-R-4 | Mersen，ATQR4 |
|
|
|
Melt at 0.07S when input current is 40A | Melt at 0.3S when input current is 40A | Melt at 1.7S when input current is 40A |
Summary:
Select time delay fuse is depends on system current, Peak let-through current, 2.5In , Teampeture etc factors, Also the mechanical design( Space, Bus-bar design)， together with fuse price, leadtime, multiple factors you need to consider when design a proper fuse.
New industry Technology regarding to Bussmann fuse, ABB breakers, Amphenol connectors, HPS transformers, etc.
TAG: time delay fuse cross reference Littelfuse cross Bussmann cross Mersen cross FNQ-R Fuse FNQ-R-4 Eaton Bussmann