Reactor, Small
Icon Block Small Reactor

Category:Energy Source

Provides electrical power for other components.

Fits small ship
Mass:130 kg
Capacity:125 L
Power:500 kW

Fits large ship and station
Mass:4,793 kg
Capacity:1,000 L
Power:15 MW

Data Controls: [edit] [purge] (?)
The Icon Block Small Reactor Small Reactor is an essential block in Space Engineers. It produces electrical power which is needed to operate most blocks.

Solar Panels and Wind Turbines are other possible sources of energy.

It is important to note that this article discusses two reactor variants: Small Reactors for Large Ships (2.5m x 2.5m x 2.5m) and Small Reactors for Small Ships (0.5m x 0.5m x 0.5m). They are not to be confused with the Large Reactor variants.

Power output and Usage

The Small Reactor is 1/27th the size of a large reactor (1x1x1 instead of 3x3x3). The Small Reactor creates 500 kW on a small ship and 15MW on a large ship or station. In Creative mode no ingots are required to generate power; however, in Survival Mode, the Small Reactor requires Uranium Ingots. The large reactor is about 1.3 times more efficient (MW/kg) on large ships. On a small ship, a large reactor produces about 1.6 times more power per mass than a small one.

The fact that the conveyor system requires power to start functioning means that a completely "dead" ship will require manual access to a reactor to start the basic systems and feed the other reactors with uranium.


With Realistic settings, the Small Reactor has an inventory with a capacity of 125 L for small ships and 1,000 L for large ships. The inventory only accepts the Uranium Ingots which fuel the reactor. If any of its inventory panels are attached to a conveyor system, the reactor will automatically pull ingots from valid inventories when it runs low.


Icon Block Small Reactor Small Reactor
ComponentLarge Ship/Station
Large Ship/Station
Small Ship
Small Ship
Icon Item Computer Computer2510
Icon Item Motor Motor61
Icon Item Reactor Components Reactor Components1001
Icon Item Large Steel Tube Large Steel Tube81
Icon Item Metal Grid Metal Grid41
Icon Item Construction Component Construction Component401
Icon Item Steel Plate Steel Plate50302

Removed Blocks
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