The Diotec 1.5KE39A is a popular component used for surge protection within electronic circuits. It is a trusty 600W 400V bidirectional transil device used to protect sensitive equipment from low and high voltage transients, with an unidirectional peak power of 1200W and peak pulse energy of 8.3 Joules. It works by diverting the energy from voltage surge to the ground. This component has very fast response times and is capable of withstanding ultra-high surge voltages. It also features a very low forward voltage loss, making it highly efficient and effective.