Mini-Breakers (Miniature Thermal Cu​toff Devices)

Mini-Breakers (Miniature Thermal Cut Off Devices)

Thermal Cutoff (TCO) devices, such as Bourns® Mini-Breakers, are utilized as safety measures to help prevent heat and fires produced by excess current, most notably in lithium-ion batteries. These products are used to safeguard batteries in electronic devices such as notebooks, PCs, tablets, digital cameras, and smartphones.

The trip temperature of the mini-breaker is a critical parameter for battery packs, and it is designed with the ability to target certain trip temperature values.

The component has UL and TÜV safety standard certifications and also uses environmental protection measures all around the globe. Bourns® Mini-Breakers are self-preserving devices that are intended to remain tripped (operated) at abnormal temperatures and then recover when power is turned off and the temperature returns to a safe level. When compared to polymer PTCs and temperature fuses used for the same applications, this enables protection at lower temperatures.

Obsolete Products marked with this symbol are currently available, although not recommended for new designs.

Quick link to the Sample Request: Request Sample
Series AA
Data Sheet AA
Technology AA Series Breaker
Description Model AA72AB0, AA77AB0, AA82AB0 and AA85AB0
Very High Current Series
Design Files Downloads
Buy Now Buy


Please visit the Thermal Cutoff Devices (TCOs) technical library for current publications.

We also offer online product training for Mini-breakers.

You may order one of our Mini-breaker design kits.

Have a look at the Mini-breaker design files (SPICE, 3D, etc.) we have to offer. Choose "Circuit Protection, Mini-Breakers (Miniature Thermal Cutoff Devices)" from the drop down menu.

Conflict Mineral Source Reporting for Mini-breakers:

  • Mini-breakers (HC Series) CMRT
  • Mini-breakers (LC Series) CMRT
  • Mini-breakers (NR Series) CMRT
  • Mini-breakers (AA Series) CMRT
  • Mini-breakers (AC Series) CMRT
  • Mini-breakers (SA Series) CMRT
  • Mini-breakers (SC Series) CMRT
Please take a quick survey
Quick survey  
Opt out

Bourns Web Survey

Please answer as many questions as you can with 1 being unfavorable and 5 most favorable.
How easy was it to find what you were looking for on our website?
How satisfied are you with the content?
Did it take you more or less time than you expected to find what you were looking for?
How likely is it that you will recommend our website to a friend or colleague?
(Please include your email address if you have any questions.)