DC - DC step down mode designed to limit input voltage.
This module is of very good quality. It can limit voltages between 3 V and 35 V, having a maximum output current of 3 A. The module is a switching source so it does not dissipate too much heat.
This output voltage can be adjusted from the potentiometer.
If you have a constant source of 30 V - 35 V, this module is ideal to build your own adjustable source.