Capacitors used in applications where damage to the capacitor may involve danger of electrical shock. These X and Y Classifications are further divided into subcategories as shown in the tables. These tests are subject to changes due to improvements in test equipment and procedures and are published for reference only. Both single and double wound construction of the metallized polyester and polypropylene films insure long term reliability.
Many series are oil impregnated to prevent annoying buzz and hum.
The electrical connection to the metallized film is made via a special multi-element solder which provides excellent surge current withstand capability and a decrease in Dissipation Factor. Lead wires are soldered or welded to provide a strong bond to the metallized element. This is particularly important during wave soldering and the ability to withstand current surges while protecting equipment. In many cases 1.5 to 4 times higher than competitive devices. The insertion loss of a capacitor is measured in a 50 Ohm system.