Fuses or Breakers

[Dennis Alwon]

This unit say suitable for circuit breakers or fuses but then says max fuse.

I assume fuses must be used/ What is your opinion

 

[LarryFine]

What is your opinion

Either.

 

[ptonsparky]

My opinion. 15 Amp breaker or fuse.

 

[Dennis Alwon]

Either.

Then why does it say Max Fuse. We went thru this the other day and everyone said fuse.

 

[LarryFine]

Then why does it say Max Fuse. We went thru this the other day and everyone said fuse.

Because the label says an HACR breaker is acceptable.

 

[Dennis Alwon]

I just called our state inspector and he agrees with you guys-- either one. Thanks but I wish they wouldn't say max fuse.

 

[petersonra]

Either.

Agreed

 

[hbiss]

Then why does it say Max Fuse

Because the words "Maximum Overcurrent Protection" wouldn't fit on the label.

-Hal

 

[Eddie702]

They should have stated "Max OCPD" Not max fuse.

I agree either one.

They left the door open for that.

 

[Seven-Delta-FortyOne]

I think it’s an old holdover from when most OCPD were fuses. A lot of folks still call any OCPD a “fuse”.

 

[LarryFine]

And often use fuse as a verb.

 

[Dennis Alwon]

The units used to say fuse or hacr breaker.

 

[Little Bill]

Probably a translation problem from foreign to English. Fuse just means OCP. That's my guess!

 

[Dennis Alwon]

What about the sccr at 5 KA. Is that an issue with residential stuff being at 10 KA?

 

[infinity]

Then why does it say Max Fuse. We went thru this the other day and everyone said fuse.

It's because manufacturers are terrible at actually making a correct nameplate.

 

[electrofelon]

It's because manufacturers are terrible at actually making a correct nameplate.

Which I dont quite understand. Seems like the listing agency would look at the label and get rid of any nonsense no? One day im gunna go to a listing agency and im pretty sure its just going to be tumble weeds blowing across an empty parking lot. Anybody home???

 

[TwoBlocked]

I read at that if you use a fuse, it can't be more than 15 amps, But there is no limit for a breakers as long as it protects the conductor, fan motor and inverter. But then I take things literally.

 

[infinity]

I don't think that it's uncommon for someone to use the word fuse when they actually mean overcurrent protection device. You would think that manufacturers would be better at this then everyday people but often they're not. People mix up proper terminology all of the time. How many times have you seen on this forum where someone talks about 15 amp plugs instead of the word receptacles?

Typcially the labeling on this equipment gets lost in translation from a manufacturer in a different country. As electrofelon asked where is the listing agency in all of this? After all they're paid to evaluate this equipment and that should include all labeling.

 

[garbo]

Old school and like to use the lowest ampere time delay quality fuse that will handle the load. For low torque applications such as fans a fuse 125% larger then motor FLA amps always held. On refrigerant & air compressors usually went with 150% of motor FLA. Years ago we had a couple of large centrifuges that you had to hold in a start button for at least halve a minute for them to reach full speed. There were on what looked like a reversing starter. Start starter bypassed the overloads. Had to go 175 to 200 % of motor FLA for fuses. We had over 35 VFD'S that drove 480 volt fan motors with 124 FLA. All had at least a 20 second ramp up time and ones without bypass had 150 amp time delay fuses and ones with bypass 175 amp fuses.

 

[Dennis Alwon]

I read at that if you use a fuse, it can't be more than 15 amps, But there is no limit for a breakers as long as it protects the conductor, fan motor and inverter. But then I take things literally.

That is an interesting take on it. I would not use more than a 15 amp overcurrent protective device but I hear ya. At our local association zoom meeting one of the members took it that way but I pooh-poohed it.