The CR4210/11 series will be able to measure this current and output the voltage, please note that over current on the CR4210/11 will cause over voltage at the output as it is a self powered unit with no regulated power supply.
Additionally you also might find that the response time of the transducers is inadequate for interrupting the conveyor operation. Typically large motors will generate damaging torque long before the response time of 250 mS for the transducer plus whatever time it takes for the PLC card to read and activate a limit.
Typically, emergency current overload switches of this nature are stand alone and are applied directly to the power of the motor, and the PLC and computer systems simply monitor status. The delay time is the reason for this typical setup.
We have a product, a CR4395 current sensing relay which can be used in this fashion. It has a set point, which when exceeded, will trip a relay that can be used to interrupt the power within the motor. It is available in various time delays to guarantee inrush does not trip it, but fast enough to guarantee safe shutdown. I have attached the catalog page for the CR4395 AC Current Sensing Relay.
Please let us know if you have any other questions.