The MMCCC250A from Mesa Microwave is a RF & Microwave Circulator with Frequency 0.6 to 3.1 GHz, Bandwidth 30 to 2500 MHz, Average Power Forward 200 W, Average Power Reverse 200 W, Insertion Loss 0.3 to 0.6 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC250A can be seen below.