The ST04-36F1-5103 with Zener Diodes 36V 400W is an electronic part manufactured by Shindengen. It is a four terminal module, made of high-temperature ceramic material, that features an integrated Zener Diode connected in parallel, designed with a maximum operating voltage of 36V and a total power rating of 400W. It is used to safely divert electricity in applications that require a fixed voltage, such as power supplies, electrostatic discharge protection circuits, and devices that need to protect against over-voltage events. It is typically used in the medical, industrial, telecommunications, and automotive sectors.