Dynagen auto start controller (ES52A). The physical difference between the ES52FS and the ES52A, the ES52FS doesn't have the red and blue thumb switches on the epoxied side of the controller. Please refer to the pictures before purchasing the Auto Start Controller.

The ES52A is designed to provide auto-start control and protection for all types of diesel and gas engine-driven equipment. The module is epoxy sealed in an ultra-compact package with mounting compatibility to an industry-standard footprint and is easily configured using onboard DIP switches and potentiometer adjustments.