Tower UPS VFI-SS-111 system for 230 V networks (Optional 6 U rack mounting kit) LCD control panel USB and serial interfaces Connection for EPO/RPO (network and relay card optional) Internal, automatic bypass Input: Hardwired (single-phase) Output: Hardwired (single-phase) Important: the UPS must be connected by a professional electrician. Recommended fuses and wire gauge: 1-phase input: 50 A, 10 mm²