Mini-Breakers (Miniature Thermal Cu​toff Devices)

Mini-Breakers (Miniature Thermal Cut Off Devices)

Bourns® Mini-Breakers are Thermal Cutoff (TCO) devices which are used as safety devices to help prevent heat and fires caused by excess current, mainly in lithium-ion batteries. Used in batteries for such devices as notebook PCs, tablets, digital cameras, and smartphones.

We have also obtained UL and TÜV safety standard certifications, and employ environmental protection measures all over the world. Our Mini-Breakers are self-preserving devices designed to stay tripped (operated) during abnormal temperatures, and then recover when power is cut and the temperature returns to a safe level. This allows for protection at lower temperatures compared with polymer PTCs and temperature fuses used for the same applications.

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 Photo Technology Description Design Files Engineering Buy Now
AA AA AA_part AA Series Breaker Model AA72AB0, AA77AB0, AA82AB0 and AA85AB0
Very High Current Series
Downloads Buy
AC AC AC_part AC Series Breaker Model AC72ABD, AC77ABD, AC82ABD, AC85ABD and AC90ABD
Very High Current, Low Impedance Series
Downloads Buy
CB CB CB_part CB Series Breaker Model CB72ABB, CB72A1B, CB77ABB, CB77A1B, CB82ABB, CB82A1B, CB85ABB, CB85A1B
Smallest Body Size
Downloads Buy
HC HC Komatsulite™ HC Series Breakers HC Series Breaker Model HC72AY-1, HC77AY-1, HC82AY-1, HC85AY-1 and HC90AY-1
Standard Package / High Current
Downloads Buy


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

NR NR Komatsulite™ NR Series A-Type and C-Type Breaker NR Series Breaker Model NR72AB0, NR77AB0, NR82AB0, NR85AB0, NR72CB0, NR77CB0, NR82CB0 and NR85CB0
Miniature Package / High & Low Current
Downloads Buy

SA SA SA-S_part SA Series Surface Mount Breaker Model SA72SB0, SA77SB0, SA82SB0 and SA85SB0
Surface Mount / High Current
Downloads Buy
SC SC sc_part SC Series Surface Mount Breaker Model SC72AAA, SC77AAA, SC82AAA, SC85AAA, SC72AAB, SC77AAB, SC82AAB and SC85AAB
Next Generation Surface Mount
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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