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Old 05-31-2018, 08:41 AM   #1
johnboy1313
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Default EGO 56V electric lawnmower, blown 40A 250V fuse

Good morning. I'm working on an EGO brand 56V electric lawnmower like this one.
https://www.homedepot.com/p/EGO-21-i...02SP/206515944

I found the 40A 250V ceramic fuse to be blown. I temporarily jumped it with a 35A blade fuse and it powered on and worked.

The fuse in question is a Schurter SUT series slow-blow fuse with pigtails for through hole mounting. When I look up the SUT series of fuses, they only show a range of 12A-30A. Iím having trouble finding an appropriate fuse. I donít have the knowledge to find a suitable replacement on my own.

Here is the data sheet for the SUT series of fuses.
https://www.schurter.com/en/datashee...SUT_6.3x32.pdf

I don't really care if the fuse has the same package as long as it works the same. I don't have the mower in front of me at the moment, but the PCB that the fuse was mounted to has pads for a smaller surface mount fuse if I could find one of the appropriate size. I'll measure the distance from pad to pad when I get back to the mower.

In the time being, I would really appreciate it if any of you with a better understanding could help me out.

Thanks guys.

Last edited by johnboy1313; 05-31-2018 at 08:49 AM..
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Old 06-01-2018, 07:17 PM   #2
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

The only thing that Digikey has that is similar is this: https://www.digikey.ca/product-detai...785-ND/2518690
However, this is a fast blow, not a slow blow...

Or this:
https://www.digikey.ca/product-detai...792-ND/2515916
https://www.digikey.ca/product-detai...0801-ND/701068
These are a slow blow.

I'd probably change the fuse holder to accept blade fuses and take a bunch of those fuses of the last link.
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Old 06-01-2018, 08:55 PM   #3
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

Can we see the circuit board that the fuse is soldered on to?
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Old 06-02-2018, 04:11 AM   #4
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

if you can mount it, how about using a domestic circuit breaker??
or use the fuses sold for car audio.

Last edited by stj; 06-02-2018 at 04:12 AM..
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Old 06-02-2018, 09:30 AM   #5
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

Quote:
Originally Posted by stj View Post
if you can mount it, how about using a domestic circuit breaker??
or use the fuses sold for car audio.
I don't know if either of those would be a good idea.

Looking at the product from the link in post #1, this appears to be battery operated (Li-ion) @ 56V. This means car fuses may not be a good idea, as the DC voltage is quite a bit higher and may arc-over badly in case of a quick-blow / disconnect event.
Likewise, a house breaker is rated for AC current, so again, I'm not sure if disconnecting high-current DC voltage would do it any good.

It's best to go with same rating and type of fuse. Of course, if you cannot find the same package / size of fuse but can otherwise match the current, voltage, and type of fuse, then going with a different package is okay - even if you run the fuse with thick wires / leads to get it connected properly.
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Old 06-02-2018, 12:03 PM   #6
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

I found a Bussman 3AG glass fuse that should work. MDL-40. The data sheet only goes up to 30A. I'll have to mount the fuse a little differently as the replacements don't have any leads.

https://www.mouser.com/datasheet/2/8...ies-335847.pdf

I've attached a pic of the board.
Attached Images
File Type: jpg IMG_5053.jpg (425.7 KB, 16 views)
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Old 06-02-2018, 01:43 PM   #7
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

the car audio fuses i'm talking about are big glass ones - they sometimes show up in other places like my old UPS.

not regular blade fuses.
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Old 06-02-2018, 03:09 PM   #8
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

Quote:
Originally Posted by CapLeaker View Post
Thank for posting this I need something like this for a cooling fan for a machine at work

I looked at what Little Fuse has in that type of fuses the lowest amperage fuse is 30 I need a 15 amps ones

Quote:
Originally Posted by johnboy1313 View Post
This is in response to what you posted above
If it were me
I would use this one and do away with the pcb board and fuse holder
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Old 06-03-2018, 07:20 AM   #9
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

Quote:
Originally Posted by sam_sam_sam View Post
Thank for posting this I need something like this for a cooling fan for a machine at work

I looked at what Little Fuse has in that type of fuses the lowest amperage fuse is 30 I need a 15 amps ones



If it were me
I would use this one and do away with the pcb board and fuse holder
you're welcome!
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Old 06-03-2018, 02:07 PM   #10
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

Thanks for the help guys I'll report back once it's working again
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Old 06-03-2018, 05:50 PM   #11
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

You have room on the PCB you can use this one:
https://www.homedepot.com/p/Cooper-B...R-40/100170316
Just wrap and solder solid wire to each eand.
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Old 06-07-2018, 09:31 PM   #12
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

This maybe useful for me as well, I have the same mower, but it haven't fail yet.
Why this fuse may have failed in the first place?
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Old 06-08-2018, 05:26 AM   #13
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

a good question.
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Old 06-08-2018, 05:37 AM   #14
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

He said he was mowing wet, tall grass when it quit working.
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Old 06-08-2018, 12:18 PM   #15
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

well if the extra load took out the fuse, it didnt have much headspace!!
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Old 06-08-2018, 12:36 PM   #16
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

Quote:
Originally Posted by stj View Post
well if the extra load took out the fuse, it didnt have much headspace!!
It would seem that way.
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Old 06-27-2018, 02:12 PM   #17
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

Quote:
Originally Posted by CapLeaker View Post
https://www.digikey.ca/product-detai...792-ND/2515916
https://www.digikey.ca/product-detai...0801-ND/701068
These are a slow blow.

I'd probably change the fuse holder to accept blade fuses and take a bunch of those fuses of the last link.
Thanks CapLeaker. I went with the first link after the "40A 250V" fuses I ordered on eBay turned out to be 40A 32V fuses. It's working again.
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Old 06-29-2018, 08:42 PM   #18
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Default Re: EGO 56V electric lawnmower, blown 40A 250V fuse

A1! I like seeing things work again!
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