The MMCCC250B from Mesa Microwave is a RF & Microwave Circulator with Frequency 3 to 6 GHz, Bandwidth 3000 MHz, Average Power Forward 100 W, Average Power Reverse 100 W, Insertion Loss 0.5 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC250B can be seen below.