Rotork IQ series Breaker/Fuse sizing

[SparkinTexas2001]

Since the IQ series comes with overload protection what is the consensus on breaker and fuse sizing? FLA vs LRA

 

[JoeStillman]

From Rotork;

Fuse / Protection Selection
Due to the unique nature of the actuator duty and taking
into account the comprehensive control protection of the IQ,
sizing of fuses or trip devices should be based on protecting
the supply cable under fault conditions.
If required, protection may be enhanced by sizing trip devices
to disconnect somewhere between 5 and 10 seconds at
starting/stall current. This will reduce the risk of severe motor
and supply cable heating under extended stall conditions
while preventing spurious trips under normal operation.
It should be noted that sizing trip devices in this manner
may not be possible while meeting other criteria and is
purely designed to protect against extreme fault conditions
such as a jammed contactor when the standard control
protection cannot de-energise the motor. All other operating
conditions are fully protected by the standard built-in IQ
control protection.

 

[Jraef]

From Rotork;

Man, that's a lot of words for a simple concept...

I think the first line is the salient point: protect the wiring.
If it's a 3 phase unit, you need to get Rotork PUB002-18.

And word to the wise based on a bad experience: do not try to use a VFD as a way to use a 3 phase Rotork when you only have a single phase supply... It says that in this manual, but nobody reads the manual BEFORE designing the system!