Selling and Administrative Expenses, also called Selling, General and Administrative Expenses, are the net operating expenses of the business that are not part of the cost of goods sold. Examples of selling and administrative expenses include advertising and the salaries of people not directly related to manufacturing a product, as well as recurring expenses as insurance and rent.
For those of you wondering, what is a protection relay? Littelfuse has the answer. A protection relay is a smart device that receives inputs, compares them to set points, and provides outputs. Inputs can be current, voltage, resistance, or temperature.
A mercury relay is a relay that uses mercury as the switching element. They are used where contact erosion would be a problem for conventional relay contacts. Owing to environmental considerations about significant amount of mercury used and modern alternatives, they are now comparatively uncommon.