The Uninterruptible Power Supply (UPS) shall be powered by 24 VDC (nominal) input and provide 24 VDC (nominal) output at 100 W (max.) for a duration of 1 min, typ. Ultracapacitors shall be employed for energy storage instead of rechargeable batteries, for maintenance-free operation. Remote device management shall be provided via Ethernet interface and multiple source, platform independent software with SNMP v1/v2c/v3 capability. The UPS shall have the ability to monitor load current and predict Hold Time in single or dual power supply applications. The UPS shall monitor and report temperature to predict changes in capacity over its lifetime. The UPS shall offer DIN rail mounting and UL 508 approval for integration into NEMA control panels or equipment cabinets.