Disc Thermostats

3/4 inch Disc Thermostat Photo

90°F Close On-Rise 3/4” Disc Thermostat
(Normally Open)

Price: $24.50 plus $4.95 USPS Priority Mail shipping (USA ONLY)

Stock Available: 10+

Manufacturer: Selco

90°F Close On-Rise (normally open) 3/4” Disc Thermostat

The circuit will CLOSE when the temperature reaches 90 °F (± 9 °F), typically turning something on, and the circuit will OPEN when the temperature falls to 70°F (± 9 °F), typically turning something off.

These direct sensing thermostats are larger than standard thermostats, giving them an even more powerful bimetallic disc and a higher electrical rating (25A). They are ideal for use with heating and air conditioning systems as well as with industrial equipment.

Designed for maximum airflow around the thermostat to give quick and accurate response.

Featuring a bimetallic, temperature-sensitive disc for snap-action in opening and closing the switch contacts. The bimetallic disc is thermally and electrically insulated from the electrical circuit, eliminating self-heating effects. Only the temperature of the controlled equipment causes the switch to actuate.

Switch operation is rapid and positive due to the characteristics of the bimetallic disc and the wiping action of the current-carrying contacts. Contact chattering is virtually eliminated, as is false cycling and sparking.


H.V.A.C. (Including Thermoelectric-based)
Major Appliances
Medical & Lab Equipment
Commercial Food Equipment


Temperature Range: Close at 90 °F ± 9 °F and Open at 70 °F ± 9 °F

Electrical ratings: 120VAC, 240VAC, 25 Amps, Resistive, 60Hz 120VAC, 10FLA, 60LRA, 60Hz, Inductive 240VAC, 5FLA, 30LRA, 60Hz, Inductive 100,000 Cycles

Temperature range: 33 ºF to 302 ºF (1 ºC to 150 ºC)

Differential: 14 ºF to 100 ºF (8 ºC to 56 ºC) for SPST Models and 27ºF to 100 ºF (15 ºC to 56 ºC) for SPDT Models

Dielectric strength: 1,500VAC/1 minute

CUL Logo

Approvals: UL File No. E145478(S), XAPX2
C-UL File No. E145478, XAPX8

Disc Thermostat Drawing