On 1/26/2014 11:00 PM, Phil Allison wrote:
"bud--"
Phil Allison wrote:
"bud--"

May or may not, depending on the fuse characteristics. The fuse has to
be
slow-blow enough to not open when the motor starts (starting current is
about 6x running current). But it has to open within the i-squared-t
rating of the motor (as in Jim's post).

** Think you will have poor luck with a HRC fuse taking 6 time rated
every
time the motor starts or stalls and not nuisance blowing.

Fuses are not usually used for motor overload protection in the US. There
aren't enough fuse ratings to match to the motor running current except
for relatively small motors.


A "motor start" circuit breaker is what is normally used.

Slow, thermal characteristic at up to 6 times and then a very fast
magnetic
action at about 10 times.


Time delay breakers can be up to 175% of the motor running current in the
US.

** Blah, blah, blah...

They often are used for short circuit protection of a motor circuit, but
not for overload protection.

** Horse manure !!!!!!!!!!

Overload protection is EXACTLY what circuit breakers are there for.

You cab size them to protect a stalled or overloaded motor or just the
supply cables.


The step between circuit breaker ratings is far too large to provide
overload protection for motors. What I described is exactly what is in
the US NEC and what practice is in the US.

Must be another alwayswrong sock puppet.