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Automation Components, Inc. (ACI) began in 1991 with a few employees in a rented space in Middleton, Wisconsin. Since its inception, ACI remains family-owned and has grown to over 240 employees operating in five buildings. ACI continues to design, manufacture, and distribute quality sensors for the HVAC and other industries. ACI is a three-time recipient of the “Wisconsin Manufacturer of the Year” award (1995 & 1999–small company category, 2017–medium company category) and is ISO 9001:2015 certified.

ACI employee in blue shirt with other employees behind him


  • Customer satisfaction–The goal is to build long-term relationships with customers, and everything at ACI is in pursuit of this goal.
  • Quality–ACI is committed to manufacturing the highest quality sensors and supporting them with the best service before and after the sale.
  • Workforce–Employee development is a priority at ACI. Numerous employees have been with ACI for over 20 years. The average tenure is over 10 years. Flexible schedules, family-friendly policies, and remote work options allow for work/life balance.
  • Sustainability–ACI always has an eye on the next generation in operations and in relationships with customers, employees, and vendors.


ACI’s product lines include temperature, humidity, pressure, current, gas, wireless, BACnet, and Modbus sensors, as well as interface devices, power meters, and numerous accessories. With over 20,000 part numbers/variations currently available and the ability to produce thousands of sensors daily, ACI can meet the needs of the largest OEMs while maintaining the personal touch and value expected from a family business.

ACI products
ACI employee


The Engineering, Technical Support, and Sales teams have decades of experience, and the tools to support every application from bid to commissioning, ensuring customers get the products they need on time and on budget. From design support to system layout, ACI’s experts can help maximize system efficiency and minimize cost. Visit our Knowledge Library here.



ACI has established itself as an industry leader. We are proud of both our industry accolades and the impact we have made on our local community. ACI has earned numerous awards for philanthropic work. Organizations supported include: UW Carbone Cancer Center, American Family Children’s Hospital, Second Harvest Food Bank of Southern Wisconsin, Habitat for Humanity, Adopt-a-Highway, and Reach Dane.

MADE in the USA


ACI is committed to American manufacturing. We invest in our facilities, and in our workforce; and we source as many components as possible from local vendors.

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