In summary, the Bourns mini-breaker is a combination of two common circuit protection technologies: a PTC and a bi-metal switch, providing several advantages over either technology on its own. The skills developed by Bourns over 75 years in precision metal stamping, plastic injection molding, and high-end assembly turn these ubiquitous technologies into a market-leading circuit protection solution. The two terminals (arm terminal and base terminal) are connected in a normally-closed position to allow current to flow through the device. Naturally, the contact point between both terminals provides a critical function, and a testament to the high precision of the mini-breaker is that the contact resistance is as low as 1 mΩ (max.) in some model families.