Supply Filter; 24 VDC The WAGO I/O System 750 can also be used in marine applications and onshore/offshore installations (e.g., platforms, loading facilities). This is possible via certification under the standards of leading agencies such as Germanischer Lloyd and Lloyd's Register. This filter module ensures proper (certified) system operation. The module filters the 24 V system power supply and is equipped with surge suppression. High-insulation versions are streamlined for use in systems with insulation monitoring.