The RFCR5857 from RF-CI is a RF & Microwave Circulator with Frequency 2.7 to 2.9 GHz, Average Power Forward 80 W, Average Power Reverse 100 W, Peak Power 500 W, Insertion Loss 0.25 to 0.3 dB. Tags: Surface Mount Circulator. More details for RFCR5857 can be seen below.