Bourns Introduces its first AEC-Q200 Tested Overtemperature Protection Mini-Breaker Devices that Broaden their Application Usage

Offering breakthrough protection for heater circuits, Bourns® Model AD and SD Series mini-breakers deliver industry-first resettable options in the industry's widest trip temperature range*

RIVERSIDE, Calif., March 13, 2023 - Bourns, Inc., a leading manufacturer and supplier of electronic components, today introduced its AD and SD Series miniature thermal cutoff (TCO) mini-breaker devices. Delivering an advanced level of resettable, accurate and repeatable overtemperature protection that has not been available before in a miniature device, the AD and SD series mini-breakers offer multiple industry-first capabilities. These are the first mini-breakers that can be either surface mountable (SD Series) or axial leaded/weldable (AD Series). They are the first to offer non-automatically resettable (self-hold) or automatically resettable (non self-hold) function options. These are also the first mini-breakers with such a wide trip temperature range (55 °C up to 150 °C). In addition, these mini-breaker series have been tested by Bourns to AEC-Q200 equivalent test standards.

Additional valuable features of the new Bourns® Model AD and SD Series mini-breakers include high trip accuracy of just plus or minus 5 °C, and very low resistance values of 4 milliohms max. These highly-repeatable devices offer ratings up to 10,000 cycles and can be used as resettable overtemperature protectors or sensors in a battery system.

"As a leading developer of miniaturized overtemperature protection solutions for more than 30 years, our goal in designing the Model AD and SD Series was to significantly push the boundaries of mini-breaker device capabilities to expand their use in a new range of markets and applications," said Brian Ahearne, Thermal & Precision Division Product Line Director at Bourns. "The series' wide trip temperature range makes them ideal for a variety of heater circuits that previously did not have overtemperature protection, or had to use bulky solutions or limited use single-blow fuses. Resettable overtemperature protection available in such miniature packages is a unique and beneficial solution to these applications and now many others."

Bourns® Model AD and SD Series mini-breakers are available now and are RoHS compliant** and halogen free***. For more detailed product information, please see:

*Any comparative claims made herein are made as of the date of publication and are made to the best of Bourns' knowledge after reasonable investigation. For more information, please contact Bourns Customer Service.

**RoHS Directive 2015/863, Mar 31, 2015 and Annex.

***Bourns considers a product to be "halogen free" if (a) the Bromine (Br) content is 900 ppm or less; (b) the Chlorine (Cl) content is 900 ppm or less; and (c) the total Bromine (Br) and Chlorine (Cl) content is 1500 ppm or less.

About Bourns

Bourns, Inc., is a leading manufacturer and supplier of position and speed sensors, circuit protection solutions, magnetic components, microelectronic modules, panel controls and resistive products. Headquartered in Riverside, California, USA, Bourns serves a broad range of markets, including automotive, industrial, consumer, communications, non-critical life support medical (low/medium risk), audio and various other market segments. Additional company and product information is available at

Bourns® and the Bourns logo are registered trademarks of Bourns, Inc. and may be used only with the permission of Bourns and proper acknowledgement. Other listed names and brands are trademarks or registered trademarks of their respective owners.

Bourns® products have not been designed for and are not intended for use in "lifesaving," "life-critical" or "life-sustaining" applications nor any other applications where failure or malfunction of the Bourns® product may result in personal injury or death. See Legal Disclaimer Notice

Agency Contact:
Annette Keller
Keller Communication
Company Contact:
David Scofield
Bourns, Inc.
(951) 781-5054