Eaton offers a variety of power electronics equipment, including simple discrete semiconductor components like TVS diodes. One such offering is 15KP40A, a standard product produced in various forms by many different suppliers. Sometimes we get customers seeking the 15KPE40A version and asking why they’re redirected to 15KP40A, instead. What does this extra ‘E’ signify?
In this case, the ‘E’ is simply a signifier digit marking this as an Eaton part number. It has no electrical significance and is considered optional; it can be safely ignored.