Thermal circuit breakers have the characteristics of small size, reliable structure, strong environmental adaptability, and strong anti-interference ability. Mainly used for overcurrent and short-circuit protection of airborne equipment such as primary and secondary power distribution systems in aviation AC/DC power distribution systems, and aircraft power supplies. At the same time, this product has the characteristics of long lifespan and high reliability. Extended products with different current and voltage specifications are gradually being widely used in electronic equipment fields such as vehicle mounted, shipborne, and land-based.