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Thermal Fuses

Thermal fuses or thermal cutoffs are safety devices designed to protect electrical appliances and equipment by detecting heat or temperature. These fuses are temperature-sensitive radial or axial switches, breaking or cutting off the circuit and electric flow. A thermal fuse only reacts to excessive temperatures compared to circuit breakers–responding to excessive currents or voltages. Cutoff fuses come with different temperature ratings ranging from 70°C (158°F) to 240°C (464°F) or higher. These ratings determine the temperature at which the fuse will open the circuit. Additionally, these one-time-use devices find applications in various household heat-generating appliances, industrial equipment, and electronics where temperature control and safety are paramount.

Why Buy a Thermal Fuse? Key Advantages to Users

Thermal fuses are an essential safety feature, preventing fires and other electrical accidents from overheating appliances. They protect valuable equipment, property, and individuals by preventing the appliances from continuing to operate when it gets too hot, which otherwise could lead to a fire or other safety issues. Other benefits of thermal fuses include:

  • They are easy to install and cost-effective.
  • Simple, compact, reliable, and versatile.
  • Fail-safe operation for extended periods.
  • Fast response time with high energy efficiency.

Operating Principle of Thermal Fuses

Thermal fuses comprise a heat-sensitive element called a pellet that melts or deforms beyond a specific temperature threshold. These safety devices work based on the principle of thermal expansion. When the temperature in the device or equipment exceeds this preset limit, the pellet reacts by melting or deforming (called burning out or blowing out), interrupting the electrical circuit to break, and cutting off power to the device.

Resettable vs. Non-resettable or Single-Use Thermal Fuses

Thermal fuses come in either resettable or non-resettable forms. A resettable thermal fuse, often called a thermal protector, can return to its normal operating state once it cools down. On the other hand, non-resettable or single-use thermal fuses require replacement because they are no longer functional. 

Typical Applications of Thermal Fuses

Thermal fuses are typically installed in equipment or appliances requiring robust protection against heat or temperatures. These devices are critical in heat-producing appliances, including:

  • Coffee Makers
  • Microwave Ovens
  • Toasters
  • Hair or Machine Dryers
  • Space Heaters
  • Electronics
  • Automotive
  • Fire Alarms
  • Battery Packs
  • Refrigerators
  • Surge Protectors.

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EYP2BN109, Panasonic
Pre Order
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£ 0.28
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£ 0.17
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Q82 A 125 05 100, Limitor
23 In Stock
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£ 4.80
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£ 4.71
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EYP1BF134, Panasonic
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£ 0.26
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AC85ABD, Bourns
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P-TCO-N350/12-2, Bourns
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P-TCO-U450/12-2, Bourns
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£ 0.33
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NIS6350MT2TXG, onsemi
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Limitor
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SF 167 R, Limitor
248 In Stock
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Limitor
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SF 139 R, Limitor
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A4-5AF, Limitor
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SM 126 A0, Limitor
328 In Stock
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P82 45 05100, Limitor
79 In Stock
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SC77AAA, Bourns
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NIS6150MT2TXG, onsemi
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SF 119 R, Limitor
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328 In Stock
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SWTC-464-3535, Selco
1838 In Stock
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£ 1.48
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SWTC-228-3535, Selco
18 In Stock
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New Items
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EYP4MU092XU, Panasonic

EYP4MU092XU, Panasonic

Panasonic Thermal Cutoffs EYP MU Series Panasonic Thermal Cutoffs (TCO) are compact and insulated, featuring quick temperature response, and mountable in a small space without insulation or protection. Panasonic TCO open reliably when the equipment becomes abnormal, and are not resettable. PCB Wire Ended Thermal fuses protect equipment against fire or thermal damage due to overload or overcharge. Suitable for use with standard single phase supplies up to 250V (230V typical). Temperature gradient: 1°C per minute.
New items
AC85ABD, Bourns

AC85ABD, Bourns

The Bourns miniature thermal cut-off (TCO) device provides over temperature and overcurrent protection for lithium polymer and prismatic cells. It controls abnormal, excessive current virtually instantaneously, up to rated limits. High current capacity, low impedance
New items
P-TCO-N350/12-2, Bourns

P-TCO-N350/12-2, Bourns

The Bourns P-TCO-N series polymeric thermal cut-off device has ultra-low resistance. The small size enables fast response time to thermal runaway events. Compact, space-saving 1206 footprint Low profile and symmetrical design
New items
P-TCO-U450/12-2, Bourns

P-TCO-U450/12-2, Bourns

The Bourns P-TCO-U series polymeric thermal cut-off device has ultra-low resistance. The small size enables fast response time to thermal runaway events. Compact, space-saving 1206 footprint Low profile and symmetrical design
New items
NIS6350MT2TXG, onsemi

NIS6350MT2TXG, onsemi

The NIS6350 is a cost effective, resettable fuse which can greatly enhance the reliability of a USB application from both catastrophic and shutdown failures. It is designed to buffer the load device from excessive input voltage which can damage sensitive circuits and to protect the input side circuitry from reverse currents. It includes an overvoltage clamp circuit that limits the output voltage during transients but does not shut the unit down, thereby allowing the load circuit to continue its operation. 88 mΩ Max RDS(on) Increased efficiency Integrated Reverse Current Protection Adjustable Output Current Limit Protection with Thermal Shutdown Fast Response Overvoltage Clamp Circuit with Selectable Level Internal Undervoltage Lockout Circuit Digital Enable with Separate FLAG for Fault Identification Integrated Current Monitoring Both Latching and Auto−Retry Options Available NIV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements, PPAP Capable These Devices are Pb−Free, Halogen Free/BFR Free Applications Automotive Infotainment USB 2.0/3.0/3.1 VBUS USB Type−C PD Charging Solid State Drives Mother Boards
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SF 167 R, Limitor

SF 167 R, Limitor

SF Series Thermal Fuse From Limitor, the SF Series of thermal cutoff limiters have a metallic body and feature a high Tm rating and quick responsiveness. These PCB non-resettable thermal fuses are suitable for use with standard single phase power supplies 250V (230V typical). Note Single Use/ Non Self Restarting Approvals VDE, SEV, UL PCB Wire Ended Thermal fuses protect equipment against fire or thermal damage due to overload or overcharge. Suitable for use with standard single phase supplies up to 250V (230V typical). Temperature gradient: 1°C per minute.
New items
SF 139 R, Limitor

SF 139 R, Limitor

SF Series Thermal Fuse From Limitor, the SF Series of thermal cutoff limiters have a metallic body and feature a high Tm rating and quick responsiveness. These PCB non-resettable thermal fuses are suitable for use with standard single phase power supplies 250V (230V typical). Note Single Use/ Non Self Restarting Approvals VDE, SEV, UL PCB Wire Ended Thermal fuses protect equipment against fire or thermal damage due to overload or overcharge. Suitable for use with standard single phase supplies up to 250V (230V typical). Temperature gradient: 1°C per minute.
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EYP2BN109, Panasonic

EYP2BN109, Panasonic

Thermal Fuse, EYP Series Compact, insulated type with excellent thermal responsiveness.Can be mounted without insulation or protection even in cramped spaces. Undergoes minimal change over time; functions when an abnormality occurs, and does not reset. Formed by a proprietary flanging process, the lead has good mechanical strength and enables easy mounting.(axial lead type only) Product Specification Nominal operating temperature (Tf) Electrical Appliance and Material Safety Law: ±7°C UL, CSA, VDE, BEAB, CCC: –10°C Maximum holding temperature (Th) Temperature at which temperature fuse will not open even if supplied with rated current continuously for 168 hours Maximum temperature limit (Tm) Temperature at which temperature fuse, having opened, can withstand for 10 minutes without suffering damage or reconducting, while no force is applied to it Manufacturer's model number Nominal operating temperature Tf (°C) Maximum holding temperature Th (°C) Maximum temperature limit Tm (°C) Electrical rating EYP05BE138 139 115 / 250 V ac 110 /125 V ac 80 to 50 V dc 200 0.5 A / 250 V ac 1.5 A / 125 V ac 4 A / 50 V dc EYP05BE145 145 125 / 250 V ac 125 /125 V ac 95 to 50 V dc 200 0.5 A / 250 V ac 1.5 A / 125 V ac 5 A / 50 V dc EYP1BF115 115 90 / 250 V ac 90 /125 V ac 80 to 50 V dc 200 1 A / 250 V ac 2 A / 125 V ac 4 A / 50 V dc EYP1BF145 145 125 / 250 V ac 125 /125 V ac 95 to 50 V dc 200 1 A / 250 V ac 2 A / 125 V ac 5 A / 50 V dc EYP2BN109 114 90 / 250 V ac 86 /125 V ac 74 to 50 V dc 200 2 A / 250 V ac 3 A / 125 V ac 5 A / 50 V dc EYP2BN110 115 90 / 250 V ac 86 /125 V ac 74 to 50 V dc 200 2 A / 250 V ac 3 A / 125 V ac 5 A / 50 V dc EYP2BN134 139 110 / 250 V ac 100 /125 V ac 70 to 50 V dc 200 2 A / 250 V ac 3 A / 125 V ac 6 A / 50 V dc PCB Wire Ended Thermal fuses protect equipment against fire or thermal damage due to overload or overcharge. Suitable for use with standard single phase supplies up to 250V (230V typi...
New items
A4-5AF, Limitor

A4-5AF, Limitor

Limitor AUPO Radial Thermal Fuses The AUPO thermal cut-off is an unresettable thermal protect instrument. Used in household appliances and industry these instruments are perfect for thermal protection. The AUPO thermal fuse comes in an all sealed structure that ensures stability and reliability. Extremely sensitive to ambient temperature Precise and stable functioning temperature Compact and reliable Epoxy sealed structure Approved by various international standards Features and Benefits PCB Wire Ended Thermal fuses protect equipment against fire or thermal damage due to overload or overcharge. Suitable for use with standard single phase supplies up to 250V (230V typical). Temperature gradient: 1°C per minute.
New items
SM 126 A0, Limitor

SM 126 A0, Limitor

SM Series Miniature ceramic body Note Single Use/ Non Self Restarting Approvals VDE, SEV, BEAB, UL, CSA PCB Wire Ended Thermal fuses protect equipment against fire or thermal damage due to overload or overcharge. Suitable for use with standard single phase supplies up to 250V (230V typical). Temperature gradient: 1°C per minute.
New items
P82 45 05100, Limitor

P82 45 05100, Limitor

P82 Series High thermal sensitivity - unnecessary to mount directly in windings Resets when temperature falls below operating point Body material impregnation proof and resistant to pressure, heat and most chemicals - suitable for encapsulation De-rate breaking capacity to 1·6A for reactive loads Note Multi-Use / Self Resetting Approvals VDE, SEV, BEAB, UL, CSA Approvals VDE, SEV, UL Pending PCB Wire Ended Thermal fuses protect equipment against fire or thermal damage due to overload or overcharge. Suitable for use with standard single phase supplies up to 250V (230V typical). Temperature gradient: 1°C per minute. Sorry Your request could not be completed at this time
New items
EYP2BN099, Panasonic

EYP2BN099, Panasonic

Panasonic Thermal Cutoffs EYP N Series Panasonic Thermal Cutoffs (TCO) are compact and insulated, featuring quick temperature response, and mountable in a small space without insulation or protection. Panasonic TCO open reliably when the equipment becomes abnormal, and are not resettable. PCB Wire Ended Thermal fuses protect equipment against fire or thermal damage due to overload or overcharge. Suitable for use with standard single phase supplies up to 250V (230V typical). Temperature gradient: 1°C per minute.
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