Compare Quick view KB ELECTRONICS SI-5 - Pre-owned Part, See Description RM290.39 SIGNAL ISOLATOR BOARD KBE 9443 115/230VAC 50/60HZU - This is a pre-owned part - All ÔUÕ suffix designated items are repackaged and may have been previously used in the field or used as demo units. ... RM290.39 Compare Quick view