This Thermostat was specifically used for Ramco Spa Controls, found on older spas back in the 1980's-1990's. It is a Low Voltage Thermostat and only found on Ramco.
Used in the following Discontinued Ramco Spa Controls: 3-00-004, 3-00-0007,3-00-0008, 3-00-0009, 3-00-0011, 3-00-0012