Current signal conditioner

I am looking for a signal conditioner that I can run a motor lead through to turn on a relay output (somewhere around 9A) to take into a PLC input. It needs to be quick switching (less than 100mS) and have an adjustable setpoint.

Anyone ever used such a thing or know of a manufacturer?

I've had good luck with these. Note they also make current switches.

http://www.nktechnologies.com/

Here are a couple of things for you to look at. The only problem I see is if you want something quick and at a specific setpoint, without some kind of built in time delay, it will activate every time the motor starts due to inrush current.

http://www.crmagnetics.com/

http://xtronics.com/current.htm