In alt.home.repair, on Sun, 16 Aug 2020 16:47:58 -0400,
wrote:

On Sat, 15 Aug 2020 19:47:38 -0400, micky
wrote:

In alt.home.repair, on Sat, 15 Aug 2020 17:07:08 -0500, dpb
wrote:

On 8/15/2020 4:12 PM, micky wrote:
In alt.home.repair, on Sat, 15 Aug 2020 07:53:01 -0700 (PDT),
wrote:

It still might be a good idea to ask the service people to come out and look the interface over. And be sure to ask if their fuses are late-model current limiting fuses or not.

What are current limiting fuses. I looked at a couple webpages and it
didn't say. I thought all fuses were current limiting.

https://www.eaton.com/Eaton/ProductsServices/Electrical/ProductsandServices/Bussmann/MediumVoltageFuses/CurrentLimiting/index.htm

"A current limiting fuse is a fuse that, when its current responsive
element is melted by a current within the fuse’s specified current
limiting range, abruptly introduces a high resistance to reduce current
magnitude and duration, resulting in subsequent current interruption."

I had read that and didn't understand it.

For ordinary distribution panel there's no point. The fuse will open
and protect what it's there to protect.

They're useful for motor starters, etc., ...

So there will still be some current to the motor starter. What's a
motor starter? ;-)

Typically a relay but it can be anything that gets a motor going and
may have some protection built in. A lot depends on what kind of motor
you are talking about and the application.

So why would you want some current to be still going through it if there
had been enough to blow the fuse? There must be a short circuit so even
the small amount of current will be going through the short circuit and
it won't be enough to close the relay.

Some 3p starters are pretty
sophisticated electronic circuits that bring them up slowly.

The same question for a starter like this.