The schematic diagrams shown below typify the internal connections of the various 61F models. The designations Ta, Tb, and Tc (sometimes referred
to collectively as “U”) may occur more than once in a product, however, the “a” terminal is always an NO contact, a “b” terminal is an NC
contact, and the “c” terminal is the common terminal.
e: The 61F11H relay deenergizes when there is water present across the Electrodes, whereas the 61F relay energizes when there is water
present across the Electrodes.
Also, the terminal connections of those Controllers provided with LED indicators differ from those which have no indicators.