The MMCCC530A from Mesa Microwave is a RF & Microwave Circulator with Frequency 300 to 1000 MHz, Bandwidth 20 to 100 MHz, Average Power Forward 500 W, Average Power Reverse 500 W, Insertion Loss 0.4 dB. Tags: Module with Connectors, Coaxial Circulator. More details for MMCCC530A can be seen below.