Mechanical Products (MP) is America's leading manufacturer of thermally-activated circuit control & protection devices. We manufacture the highest quality components available for sensing and preventing dangers associated with damaging electrical current overloads, for a wide variety of products and equipment. Engineers specify MP circuit breakers to safeguard both people and equipment in aerospace, defense, factory automation, major appliances, computers, transportation, and medical equipment. For over 60 years, MP has been in the forefront of the circuit protection business, with advanced product innovation, unsurpassed product quality and unparalleled service. MP was first established during WWII and began manufacturing circuit protectors in 1943.