Electromechanical Thermostats TF1 – Bimetal Thermostat SPST Faston Earth Return TF2 – Bimetal Thermostat SPST Faston TF3 – Bimetal Thermostat Wired SPST TF4 – Bimetal Thermostat SPST DIN Connector TF5 – Bimetal Thermostat SPST Integrated Connector