New industry Technology regarding to Bussmann fuse, ABB breakers, Amphenol connectors, HPS transformers, etc.
KLDR fuse cross reference
Content Guideline:
1, Customer complaint on KLDR fuse
2, KLDR Fuse cross reference to Bussmann FNQ
3, Why fuse resistance is important to fuse and device?
4, Fuse cross reference guide?
Customer complaint on KLDR fuse
We receive a customer complaint on the KLDR fuse when they have an incoming inspection. The PN: KLDR004 fuse cold resistance cannot meet the nominal data: 0.118 Ohm. The actual resistance is bigger than 0.9 Ohm.
Following is Bussmann FNQ and Littelfuse KLDR fuse manufacturer standard:
FNQ-R-1-1/2 = .5700 - .7490 Ohms
FNQ-R-5-6/10 = .0530 - .0590 Ohms
FNQ-R-1/2 = 5.220 – 7.400 Ohms.
KLDR.500 = 4-10 Ohms
KLDR 1-1/2= 0.898 - 1.2 Ohms
KLDR 008= 0.026 - 0.9 Ohms
Base on the testing result, the Customer change the KLDR fuse to FNQ.
Fuse cross reference chart KLDR to FNQ
| Bussmann catalog PN | Littelfuse cross reference PN | Fuse description |
| FNQ-R-1 | KLDR001 | CLASS CC TIME DELAY 1A |
| FNQ-R-1-1-2 | KLDR01.5 | 600VAC, 1.5A, CLASS CC TIME DELAY fuse |
| FNQ-R-1-1-4 | KLDR1.25 | 1.25AMP fuse, CLASS CC TIME DELAY, 600VAC |
| FNQ-R-1-1-8 | KLDR1.12 | TIME DELAY fuse, CLASS CC , 600VAC, 1.12A |
| FNQ-R-1-2 | KLDR.500 | CLASS CC fuse, 0.5A, TIME DELAY |
| FNQ-R-1-3-10 | KLDR01.3 | 1.3A, current limiting fuse, CLASS CC, TIME DELAY |
| FNQ-R-1-4 | KLDR.250 | 0.25A, 600VAC, UL approval, CLASS CC, TIME DELAY fuse |
| FNQ-R-1-4-10 | KLDR01.4 | TIME DELAY, CLASS CC, UL248-4 fuse, 1.4A |
| FNQ-R-1-6-10 | KLDR01.6 | 600VAC, 1.6A, CLASS CC fuse, TIME DELAY |
| FNQ-R-1-8-10 | KLDR01.8 | TIME DELAY, CLASS CC fuse, 1.8A |
| FNQ-R-10 | KLDR010 | 10A, Transformer protection fuse, CLASS CC, TIME DELAY |
| FNQ-R-12 | KLDR012 | REJECTION FUSE,CLASS CC, TIME DELAY, 12A |
| FNQ-R-15 | KLDR015 | 15A, 600VAC, CLASS CC TIME DELAY REJECTION FUSE |
| FNQ-R-17-1-2 | KLDR017.5 | 17.5A, UL, CSA, CE fuse, CLASS CC TIME DELAY |
| FNQ-R-2 | KLDR002 | Current limiting fuse, 2A, TIME DELAY, CLASS CC |
| FNQ-R-2-1-2 | KLDR02.5 | 300VDC, 600VAC, 2.5A, CLASS CC fuse |
| FNQ-R-2-1-4 | KLDR2.25 | TIME DELAY,CLASS CC fuse, 2.25A, 300VDC |
| FNQ-R-2-8-10 | KLDR02.8 | 2.8A, 300VDC, current limiting fuse,TIME DELAY |
| FNQ-R-20 | KLDR020 | REJECTION FUSE, 20A, 300VDC, CLASS CC, TIME DELAY |
| FNQ-R-25 | KLDR025 | CLASS CC, 20A, 600VAC, TIME DELAY, REJECTION FUSE |
| FNQ-R-3 | KLDR003 | FUSE 3 A 600VAC, current limiting |
| FNQ-R-3-1-2 | KLDR03.5 | 3.5A, UL248 fuse, 300VDC, CLASS CC TIME DELAY |
| FNQ-R-3-10 | KLDR.300 | 0.3A fuse, transformer protection, CLASS CC, TIME DELAY |
| FNQ-R-3-2-10 | KLDR03.2 | TIME DELAY,3.2A, 600VAC, CLASS CC fuse |
| FNQ-R-3-4 | KLDR.750 | Fuse ratings: 0.75A, 300VDC, 600VAC, CLASS CC fuse |
| FNQ-R-30 | KLDR030 | 10x38mm limitron fuse, 30A, CLASS CC TIME DELAY REJECTION FUSE |
| FNQ-R-4 | KLDR004 | 4A, 600VAC, limitron fuse, TIME DELAY,CLASS CC |
| FNQ-R-4-1-2 | KLDR4.25 | 300VDC, 4.25A, TIME DELAY,CLASS CC fuse |
| FNQ-R-4-10 | KLDR.400 | CLASS CC, 0.4A, 600VAC, TIME DELAY fuse |
| FNQ-R-5 | KLDR005 | 5A, industrial fuse, NEC , CLASS CC fuse |
| FNQ-R-5-6-10 | KLDR05.6 | CLASS CC, 5.6A, commercial fuse |
| FNQ-R-6 | KLDR006 | TIME DELAY, 6A, 300VDC, industrial transformer protection fuse |
| FNQ-R-6-1-4 | KLDR6.25 | CLASS CC, 6.25A, 600VAC, NEC/UL/CSA/IEC fuse |
| FNQ-R-6-10 | KLDR.600 | 0.6A, 300VDC, TIME DELAY fuse |
| FNQ-R-7 | KLDR07 | 600VAC, 7A, CLASS CC, TIME DELAY fuse |
| FNQ-R-7-1-2 | KLDR07.5 | 7.5A, TIME DELAY fuse |
| FNQ-R-8 | KLDR008 | CLASS CC,10 X 38mm, 8A 600V AC fuse |
| FNQ-R-8-10 | KLDR.800 | 300VDC/600VAC, 0.8A, CLASS CC fuse |
| FNQ-R-9 | KLDR009 | CLASS CC, TIME DELAY, commercial fuse, 9A, 600VAC |
Why fuse resistance is important to fuse and device?
From the fuse size, we cannot recgonize the fuse quality. For fuse, the most improtant factor is resistance.
As we know, fuse element is made from silver belt. the silver belt purity is the heart for a fuse, especially high speed fuse; If fuse resistance is higher, it means that the fuse element silver purity is lower, Then the connecting performance will be impacted. The tempeture rise will be higher when operation. The fuse may will melt ahead or not melt timely instead.
If the fuse cannot melt in the right time, it cannot protect the circuit and devices accrodingly.
That's why the resistance is so important.
Fuse cross reference guide
How to find right fuse cross reference?
You can find fuse cross reference on Eaton, Littelfuse, Mersen. Engineers have professionally compare the performance.
Fuse cross reference are according to these factors:
Fuse application
No matter you are using time delay fuse or high speed fuse in current device, you will need to double check the fuse speed base on your application. Because you cannot test fuse speed in incoming inspection, fuse speed is a distructive experiment which only can be measured in fuse manufacturers side.
Fuse voltage
Fuse current
Fuse size
Fuse performance
Maximum available fault current, Pulses, Surge Currents, Inrush Currents, Start-up Currents, and Circuit Transients
Fuse Agency Approvals
Such as UL, CSA, VDE, METI, MITI or Military
Testing and verification prior to production
If you plan to use the alternate part in long term, suggest to test the fuse interchange part samples in your device; The fuse size, performance can be measured during single testing and system testing. Especially the tempeture rise, resistance etc electric performance.
New industry Technology regarding to Bussmann fuse, ABB breakers, Amphenol connectors, HPS transformers, etc.
TAG: fuse cross reference Bussmann fuse Littelfuse fuse element KLDr FNQ