Instantaneous Trip Circuit Breaker and VFD

[nc_mac]

Can an instantaneous trip circuit breaker be used as the branch circuit protector for a variable frequency (speed) drive? What is considered a "listed combination motor controller" as used in 430.52(C)(3)?

 

[Buck Parrish]

Whwen it has a listed need. And or the motor has overload protection.
Look here http://ecatalog.squared.com/pubs/Circuit Protection/0600DB0801.pdf

 

[weressl]

Can an instantaneous trip circuit breaker be used as the branch circuit protector for a variable frequency (speed) drive? What is considered a "listed combination motor controller" as used in 430.52(C)(3)?

No..........