This chapter is concerned with the manufacture of vacuum switchgear, the emphasis being on vacuum. It concerns what is unique to vacuum; the fabrication of cubicles, the forming and assembly of busbars are not discussed, nor are provisions for CTs, PTs, relays, etc., all of which are common to every other switchgear technology. In practice, of course these items cannot be ignored, they are vital parts of the assembly line; but they are not addressed in this chapter. As with most manufactured items, the process starts with the making of individual parts or components, which are then brought together into subassemblies; these in turn are assembled in a final product. Quality checks are made along the way and tests are performed on the final product. Steady flow is the objective, and most especially, steady flow with the minimum of inventory. In this regard a good figure of merit is the ratio of throughput to inventory. The recent trend, already referred to in the chapters on design, of reducing the number of parts and standardising on parts as far as possible, clearly helps in this regard. In the manufacture of the interrupter there are some special considerations and constraints. For example, it is sound policy to get internal parts, once prepared, into their final vacuum environment as quickly as possible to avoid their contamination and degradation. Several processes brazing, degassing take a prescribed time because of the heating/cooling cycle. It is clearly desirable to accomplish these comfortably within a working shift. Throughput is then determined by batch size. In the category of what is unique to vacuum, the interrupter is surely pre eminent. Accordingly, this chapter begins with this component.