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 Data Sheet Technology Description Design Files Engineering Buy Now
AA AA AA Series Breaker Model AA72AB0, AA77AB0, AA82AB0 and AA85AB0
Very High Current Series
Downloads Buy
AC AC AC Series Breaker Model AC72ABD, AC77ABD, AC82ABD, AC85ABD and AC90ABD
Very High Current, Low Impedance Series
Downloads Buy
HC HC HC Series Breaker Model HC72AY-1, HC77AY-1, HC82AY-1, HC85AY-1 and HC90AY-1
Standard Package / High Current


LC LC LC Series Breaker Model LC72AY-1, LC77AY-1, LC82AY-1 and LC85AY-1
Standard Package / Low Current

NR NR NR Series Breaker Model NR72AB0, NR77AB0, NR82AB0, NR85AB0, NR72CB0, NR77CB0, NR82CB0 and NR85CB0
Miniature Package / High & Low Current
Downloads Buy

SA SA SA Series Surface Mount Breaker Model SA72SB0, SA77SB0, SA82SB0 and SA85SB0
Surface Mount / High Current
SCxxAAA SCxxAAA SC Series Surface Mount Breaker Model SC72AAA, SC77AAA, SC82AAA, and SC85AAA
Next Generation Surface Mount w/1.07 ± 0.05 mm Body Thickness
Downloads Buy
SCxxAAB SCxxAAB SC Series Surface Mount Breaker Model SC72AAB, SC77AAB, SC82AAB, and SC85AAB
Next Generation Surface Mount w/0.94 ± 0.05 mm Body Thickness
Downloads 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 (KCA Series) CMRT
  • Mini-breakers (SA Series) CMRT
  • Mini-breakers (SC Series) CMRT
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