The Safezone Radiator is a type of electricity-powered barricade in Unturned. It resembles a Generator with green plating and additional parts.
The Safezone Radiator, like most powered barricades, requires a nearby Generator that is turned on in order for it to work. When turned on, nearby item and zombie spawn points are rendered non-functional. This means that items and zombies cannot (re)spawn in the area as long as its generator is still powered. However, zombies from outside the Safezone Radiator's influence can still enter the area.
While it's functional, it emits a rumbling sound that is identical to the one that the generator produces.
Unturned's prototype, Deadzone, has a similar feature called the Safezone which is an area where all players spawn with no danger from zombies.