Microtemp Thermal Cutoffs (TCO's, G4A, G5A, G7F Series), Snap Action Bimetal Switches (36T, 60T Series), NTC Thermistors, and Thermistor Probes.

Therm-O-Disc represents innovation in sensor and control development for the appliance, electronic and automotive industries. As the world's leading supplier of controls to the appliance industry, Therm-O-Disc offers a wide array of general and special-purpose products, including NTC Thermistors, Thermistor Probes, Snap Action Thermostats, and Micro Temp Thermal Cutoffs.  We do not supply repair or replacement parts to the public, please contact the OEM (original equipment manufacturer) for replacement parts.

NTC Thermistors Bi-Metal Thermostats Thermal Cutoffs


NTC Thermistors


Axial Leaded
+/- 10%
Precision Axial Leaded +/- 2% Packaged
+/- 5%
Plastic Probes
+/- 1%, 2%
Metal Probes
+/- 1%, 2%
            1H103T- 10K ohms P1H302T - 3K ohms ASN1H103J - 10K ohm  AP03201 - 10K ohm 11J1H0228 - 10K ohm
         P1H103T - 10K ohms   12J1H0183 - 10K ohm 10J1H0036 - 10K ohm
         P1H104T - 100K ohms   12J1H0184 - 10K ohm  

Snap Action Bi-Metal Thermostat    

See our Video Introduction to 36T BiMetal Switches.  See our 36T Bimetal Disc Application Notes.

36T Automatic Reset - Rated at 15 Amps @ 120 VAC, 10 Amps @ 250 VAC

36T21 - Normally Closed - Open On Rise Thermostats

36T22 - Normally Open - Close On Rise Thermostats

60T Manual Reset - Rated for loads up to 25 Amps @ 250 VAC

The snap action of the bimetal disc provides high-speed contact separation resulting in excellent life cycle characteristics at electrical loads up to 25 amps at 240 VAC.  The 60T carries global recognition and is used in many major appliance and HVAC applications.

60T15 Normally Closed Open on Rise - Manual Reset

Microtemp Thermal Cutoffs

Microtemp Thermal Cutoffs from Therm-O-Disc offer an accurate, reliable solution to the need for upper limit temperature protection. Know as a thermal fuse, thermal link, or TCO, the MICROTEMP thermal cutoff provides protection against overheating by interrupting an electrical circuit when operating temperatures exceed the rated temperature of the cutoff.

The operating principle of the thermal cutoff is a electrically nonconductive pellet that under normal operating temperatures will hold the spring loaded contacts closed. When a predetermined temperature is reached, the pellet melts, allowing the compression spring to relax. The trip then slides the contact away from the lead and the circuit is opened. After the thermal cutoff opens the circuit it must be replaced. These devices are often referred to as "one shot" thermal fuses. All temperatures are in Celsius.

Microtemp® thermal fuses from Therm-O-Disc® are available in a variety of standard and custom configurations, providing reliable one-shot over-temperature protection for a wide variety of applications.

G4A MicroTemp Thermal Cutoffs - Temperature Range 72C to 257C

Ratings: 10A @ 250 VAC, 15A  @ 120 VAC

Part Number Temperature Degrees Celsius Temperature Degrees Farenheit
G4A01072C 72 162
G4A01077C 77 171
G4A01084C 84 183
G4A01104C 104 219
G4A01110C 110 230
G4A01117C 117 243
G4A01121C 121 250
G4A01128C 128 262
G4A01134C 134 273
G4A01141C 141 286
G4A01144C 144 291
G4A01152C 152 306
G4A01158C 158 316
G4A01167C 167 333
G4A01172C 172 341
G4A01184C 184 363
G4A01190C 190 374
G4A01192C 192 378
G4A01205C 205 401
G4A01216C 216 421
G4A01229C 229 444
G4A01240C 240 464
G4A01257C 257 495
See All G4A's    

G4A01257C - Highest Holding and Open Temperature on the Market !

G5A MicroTemp Thermal Cutoffs
 - Temperature Range 72C - 257C

Ratings: 20A @ 250 VAC, 25A  @ 120 VAC

Part Number Temperature Degrees Celsius Temperature Degrees Farenheit
G5A01072C 72 162
G5A01077C 77 171
G5A01084C 84 183
G5A01093C 93 199
G4A01098C 98 208
G5A01104C 104 219
G5A01110C 110 230
G5A01117C 117 243
G5A01121C 121 250
G5A01134C 134 273
G5A01141C 141 286
G5A01144C 144 291
G5A01152C 152 306
G5A01167C 167 333
G5A01184C 184 363
G5A01192C 192 378
G5A01216C 216 421
G5A01229C 229 444
G5A01240C 240 464
G5A01257C 257 495
See All G5A's    

G7F MicroTemp Thermal Cutoffs - Temperature Range 77C to 184C

Ratings: 5A @ 250 VAC, 30% smaller than the G4A & G5A Series

Part Number Temperature Degrees Celsius Temperature Degrees Farenheit
G7F01077C 77 171
G7F01084C 84 183
G7F01093C 93 199
G7F01098C 98 208
G7F01110C 110 230
G7F01117C 117 243
G7F01121C 121 250
G7F01128C 128 262
G7F01144C 144 291
G7F01152C 152 306
G7F01167C 167 333
G7F01184C 184 363
See All G7F's    

TESTCO does not provide service parts to the general public. Consequently, to receive an exact replacement part you must contact the Original Equipment Manufacturer (OEM).

Therm-O-Disc is a large manufacturer of bimetal thermostats, thermal fuses, and other devices. The majority of their products are custom made and proprietary for Original Equipment Manufacturers (OEM's).  We offer some standard configurations, however, the user must determine the suitability of the control for their application, including the level of reliability required, and are solely responsible for the function of the end-use product.  These controls contain exposed electrical components and are not intended to withstand exposure to water or other environmental contaminants which can compromise insulating components. Such exposure may result in insulation breakdown and accompanying localized electrical heating. A control may remain permanently closed or open as a result of exposure to excessive mechanical, electrical, thermal, or environmental conditions or at normal end-of-life. If failure of the control to operate could result in personal injury or property damage, the user should incorporate supplemental system control features to achieve the desired level of reliability and safety.

There are no express warranties that extend beyond the description contained herein. Please review our Terms & Conditions before ordering.

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