The P6KE300A with Diode, manufactured by Diotec, is a unidirectional, ±5%, 600W, 300V transil diode in a DO15 package. It is designed to protect the connected equipment against transients such as lightning, inductive load switching, or other voltage transients. The diode is designed to clamp the transient voltage and dissipate the energy it stores as heat. It is commonly used in power supplies, telecom systems, and industrial equipment.