The Sentri class medium fighter was fast but lightly armed aerospace fighter deployed by Centauri Republic fleet. House Tavari Armaments located at Hevaria Orbital Shipyards over Tolonius VII is responsible for manufacturing this class of vessel.
Since Sentri fighters have a greater manoeuvrability and acceleration than the Earthforce Starfury Centauri pilots can perform drastic and stressful manoeuvres that will cause them to pass out passing control over to the autopilot which will complete the manoeuvre bringing the fighter around to a superior tactical position. 
The fighter was specifically designed for speed, maneuverability, easy mass-production and meant to complement the large, slow Primus class battle cruisers. Unlike most other fighters, the Sentri was not expected to engage in deepspace combat independently. Instead, Sentri squadrons were used to defend the Primus formations against flank and rear attacks.
The fighter's speed and maneuverability allowed Centauri pilots to maneuver in and around the Primus formations, quickly moving to answer flanking threats with some support from the Primus' side-firing guns. Combining Sentri's fast interception speed with the Primus' heavy firepower, making Centauri formations very difficult for opposing forces to ambush.
They have also proven adept at supporting Vorchan class medium warships though the Vorchans themselves don't feature fighter support facilities, limiting the effective range of such formations to within a few jumps of a base or mothership.
Capable of both atmospheric and non-atmospheric flight, it was one of the largest and most powerful fighters in either environment.
The Sentri's relatively light armaments can work to its disadvantage when faced with superior numbers.
Behind the Scenes
The ship was designed by Mark Kochinski of Foundation Imaging. The early design of the ship featured blocky cockpit which was later redesigned to become more rounded.  An updated version of the fighter designed by CG Artist Jose Perez appeared in The Lost Tales - Voices in the Dark. 
- Sentri's entry at archived website of unreleased computer game Babylon 5: Into the Fire, which canon status is not verified, states the dimensions of fighter are as following: Length: 20m, Beam: 33m, Draught: 9m. 
|Centauri Republic Ship Classes|
|Primus-class Battle Cruiser Vorchan-class Medium Warship|
|Sentri-class Medium Fighter|
|Primus-class Liner Variant Liner Transport Atmospheric shuttle Crew Shuttle|
|Space station Shipyard Blockade mine Perimeter mine|