Molded case circuit breakers (MCCB) are widely used protective devices in low-voltage distribution systems. They are mainly used to provide overload, short-circuit and under-voltage protection for lines and equipment, and also have the function of isolating power sources. Its price is greatly influenced by factors such as brand, rated current, breaking capacity and functional configuration. Generally speaking, the price of domestic ordinary molded case circuit breakers ranges from 50 to 1,000 yuan, among which products with a capacity of less than 100A are usually priced between 50 and 300 yuan. The price for large current specifications (250A to 800A) is approximately 300 to 3,000 yuan. The products of international brands such as Schneider Electric, ABB and Siemens are relatively expensive. The price of some intelligent products can reach several thousand yuan.

Molded case circuit breakers are mainly applied in industrial plants, commercial buildings, residential power distribution systems, power distribution cabinets, photovoltaic power generation systems and infrastructure construction, etc. In the industrial field, it can be used for the protection of electric motors, production equipment and distribution lines. In the construction field, it is often used as the main switch or branch switch of the distribution cabinet to ensure the safe and stable operation of the power supply system.