Product Specifications

2-Disc Combination Control and Limit

The 75TF line of temperature controls combines automatic reset and single operation in one unique switch design. Two independent switch mechanisms, electrically in series, provide primary and secondary temperature sensing at electrical loads up to 25 amps @ 240 VAC. The 5/8 (16mm) cycling disc is available in calibrations from 80F (27C) to 300F (149C) and differentials from 15F (8C) to 50F (28C), while the 3/4 (19mm) fuse disc is available in calibrations from 150F (66C) to 350F (177C). A variety of terminal and mounting options are available for design flexibility. The 75TF is a viable alternative in applications where space prohibits two separate sensing devices.

Additional Feature and Benefits:

• Primary and secondary temperature sensing in the same location.

• Automatic reset SPST in series with the single operation SPST.

• Snap action bimetal disc for high speed contact separation.

• A wide variety of terminal and mounting options for design flexibility.

• Welded construction for integrity of current carrying components.

• Available with an exposed or enclosed bimetal disc for either increased thermal response or protection from airborne contaminants.

Switch Action and Typical Applications:

The 75TF combines two single pole, single throw (SPST) circuits in series to provide cycling and single temperature operation. The cycling switch can be built to either open or close its electrical contacts on temperature rise. Once the temperature returns to the specified reset calibration, the contacts automatically return to their original state. Utilizing a unique bridging contact system, the single operation switch opens the circuit at the specified back-up calibration in the event the cycling switch fails to operate.

Typical applications include electric heat furnaces and electric dryers where approval agencies require the use of limit and back-up limit protection.