Tower and rack UPS VFI-SS-111 system for 230 V networks With 2U rack mounting bracket LCD control panel Optional parallel/redundant operation (max. 3 systems) USB and RS-232 serial interfaces Connection for EPO switch (emergency power off) Incl. internal, automatic bypass Input: Hardwired (single-phase) Output: Hardwired (single-phase) . (runtime see battery pack) . Important: the UPS must be connected by a professional electrician. Recommended wire gauge: 10 mm