1. EPS emergency power supply: from charger, inverter, battery, isolation transformer, switch It is an emergency power source that inverts DC power into AC power. It is suitable for loads that allow interruption of power supply for more than 0.25s.
　　2.UPS Uninterruptible power supply: It is mainly composed of power converter energy storage device (battery) and switches (electronic and mechanical) to ensure the continuity of power supply static AC uninterruptible power supply device. It is suitable for loads whose allowable interruption time is milliseconds.
　　 3. Self-provided emergency diesel generator set: It is a power generation equipment composed of a diesel engine that drives a power frequency AC synchronous generator. The quick and self-starting generator set is suitable for buildings where the power supply interruption time is more than 15s. The working time of the emergency power supply should be considered in accordance with the power outage time allowed in the production technology. When used in conjunction with an automatically-started generator set, it should not be less than 10 minutes.
　　4. A dedicated feeder circuit with automatic input device independent of normal power supply. The operation time suitable for the automatic switching device can meet the emergency power supply whose allowable interruption time is 1.5s or more than 0.6s. For particularly important loads with a power failure time of milliseconds and a small capacity, if it is possible to use a DC power supply, the battery pack should be used as an emergency power supply.
　　 5. Self-provided emergency gas turbine generator set; it is a power generation equipment composed of a gas turbine driven by a power frequency AC synchronous generator.