The 90S is a core alignment fusion splicer setting a new standard in the market for fusion splicing. The 90S is packed with a whole host of new and enhanced features specifically developed with the objective of enabling the user to work faster with higher precision. Overall splice process time has been significantly reduced. This has been achieved with a combination of improvements to the reaction time of the automated wind protectors and automated heater, new fibre retention clamps, improved universal sheath clamps and a redesigned internal structure that matches the protection sleeve to the fusion splice point which enables splicing to be achieved without the need of the user to touch the 90S once the process has started.