The MMCCC400A from Mesa Microwave is a RF & Microwave Circulator with Frequency 1.7 to 3.5 GHz, Bandwidth 1800 MHz, Average Power Forward 200 W, Average Power Reverse 200 W, Insertion Loss 0.7 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC400A can be seen below.