STEMCO Capillary Switch

About Us

In 2012 the STEMCO Capillary Thermostat product line was acquired by Senasys, Inc. All manufacturing was moved to our main facility in Altoona, Wisconsin.

At Senasys, we take pride in our customer service as we are an engineering based community. We manufacturer over a million switches a year of 10 different varieties, including temperature switches, pneumatic controls, industrial panel mount controls and more! We provide low to medium volume manufacturing to customers all over the world. If you are looking for a precise switch to meet your requirements, we’re your team.

Since acquiring the STEMCO product line we have made a number of improvements to the product and we have developed close long term relationships with our customers which have come to value and rely on our products and services.

We are always striving to seek better ways to meet our customer’s needs with a strong commitment to innovation, quality and service. These are the cornerstones of our philosophy.

Our capillary switches hold approvals including UL and CUL.

Senasys specializes in designing and producing switches for food service and industrial marketplaces.

Our design capabilities include:

  • Rapid Prototyping
  • Printed Circuit Board Design
  • Electro-Mechanical Products
  • Manufacturing Facilities

All Senasys products made in the United States. Browse our complete catalog at

Senasys confirms that to the best of our knowledge the Presair products we currently supply to meets the RoHS2 and REACH directives. Please find documentation below. If you require any other information, please e-mail

We look forward to working with you!

More information about capillary thermostat switches Contact Senasys about capillary thermostat switches



CMRT 4.20 Company Wide 2017