Help read diagram

Let'sgoflying! said:
On most of the dimensions, there are two numbers.
They are significantly different so I can’t believe they are manufacturing variations.
Reading this on phone right now, so I may have missed their explanation.

Click to expand...
Guessing - It reads like a spec issued for a particular use, based on a design spec. That those are min and max numbers, so you know you're going to get a breaker that fits within those tolerances, but they might be made differently. Partly basing that on the differences seeming to be less than 1/16", pretty much exactly.
 
I guess I’m used to seeing
1.15 +/- 0.01” instead of this ‘range’ of possible sizes.

And also much smaller tolerances, ie 5-10 thousands for a part of this size.

Thanks Tom.
 
They're limit dimensions, quite common. Instead of a +/- figure, they give the min and max limits. For example, that 1.317/1.287 means the same as 1.312±.015 (1-5/16 ± 1/64)
 
Let'sgoflying! said:
I guess I’m used to seeing 1.15 +/- 0.01” instead of this ‘range’ of possible sizes.
Click to expand...
It can depend on the standard used to make the drawings how the dimensions are referenced.

And to add to the above, I believe the dimension ranges have to do with it being an "envelope" drawing of the breaker. I might be wrong but I seem to recall the term used prior discussions I've had. Looking at my other spec books on Klixon breakers, they show a singular dimension for installation and planning purposes.
 
Let'sgoflying! said:
I guess I’m used to seeing
1.15 +/- 0.01” instead of this ‘range’ of possible sizes.

And also much smaller tolerances, ie 5-10 thousands for a part of this size.
Click to expand...
It's an assembly of plastic and stamped and machined metal parts, it's not gonna be held to ±.001, it's not necessary and would cost a lot more.
 
Amazed at the voltage drop table. Is this is after a trip with the rated breaking current? These things won't last forever for sure.
 
Dana said:
It's an assembly of plastic and stamped and machined metal parts, it's not gonna be held to ±.001, it's not necessary and would cost a lot more.
Click to expand...
I said, "0.010" ten thousandths; gotta mind that decimal.

Not an unreasonable range for such parts. No one would expect plastic/phenolics to be to one one-thousandths.
 
nrpetersen said:
Amazed at the voltage drop table. Is this is after a trip with the rated breaking current? These things won't last forever for sure.
Click to expand...
voltage drop is because these are thermal circuit breakers. AFAIK, all the little DC breakers work that way. They're pretty reliable.
 
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