An Emergency Power Generator (NSA) is a system that generates energy using fuel. This type of power generator is deployed in places where power failure is unacceptable, such as operating rooms, data centers, and traffic tunnels, and where a long autonomy time needs to be guaranteed. During a power outage, the emergency power installation takes over the power supply, ensuring that critical processes continue. However, an NSA requires a startup time, which is why a UPS is always needed to avoid "going through the dark."

The operating duration of an NSA depends on the amount of fuel available for the generator. Depending on the size of the fuel tank and the possible refilling during operation, the generator of an NSA can run as long as there is fuel provided. An NSA starts up after it receives a startup command. This command comes from a control system, which detects when the power has gone out. An NSA always needs a few seconds to fully rev up and provide the entire load with power, which is why it's also referred to as a "short-break" solution.

A UPS and a generator are both emergency power solutions. Unlike a UPS, an NSA can't provide uninterrupted power because the generator doesn't run continuously and always needs a short time to start up. During a power outage, the UPS system switches on immediately to prevent you from losing power. The NSA also starts up automatically. After a certain time, the transition from the UPS to the NSA is done seamlessly. Together, both systems provide a complete emergency power supply.