Industrial RS-485 separator with 4500V isolation and Alnico housing. Optoisolator (4500V), RS-485 interface separator (repeater) with Alnico housing compatible with IEC61000-4-5 and ITU-TK20&K21 standards for top quality surge protectors. FL485 have high respond speed, low output rudimental voltage, ascendance transfer performance. All have #10 ground screws which must be connected to a solid ground.Features:Three stages of protection on ever..