Breakers in series 1

[Mbrooke]

How does one go about controlling two breakers in series? Do I just wire the 52A contacts in series and the trip / close contacts in parallel and program the relaying as with a single breaker or am I overly simplifying it?

 

[cranky108]

Years ago, on sub-transmission, and distribution, there was a thing that was called a reclosing fuse. And not that I would recommend one.

They were used on long out of the city feeders, and would handle lighting strikes, by replacing the blown fuse with a fresh one. But after several strikes it would run out of fresh fuses.

But I doubt that was what David intended in his fuse reclosing comment.

 

[Mbrooke]

You mean these critters?

https://www.sandc.com/en/products--services/products/three-shot-type-xs-fuse-cutout/

I have to admit I've never seen one of these in the wild- but I could see them being economical over a typical single phase recloser.

 

[davidbeach]

That's just throwing multiple single shot fuses at it. How often would you patrol to see if any of them need to be replaced? I understand that 115kV transformer fuses run several thousands of dollars a piece. Very few operations and the breaker is less expensive.