H2A Cinematic PinchFusionReactor

A Covenant Pinch Fusion Reactor.

Pinch fusion reactors are a form of power generator that can be found aboard Covenant warships.[1] They are probably widely used in other Covenant structures but there is currently no evidence of this. They use tritium as fuel and appear more advanced than UNSC fusion reactors. If their cooling systems are disabled or their maximum heat loads are exceeded, they will fail explosively providing a detonation on a similar scale of UNSC warship reactors.

The fusion reactor can also be scaled down and used as a weapon as shown in Halo: Reach Type-38 Anti-Aircraft Cannon.