1. Molded case circuit breakers can connect thicker wires, such as those over 35 square meters. Small circuit breakers are only suitable for connecting wires of less than 10 square meters&# 160; 2. The end of the molded case circuit breaker is connected with a nut, which is easy to press and has good contact. Small circuit breakers use smaller compression terminals and can only be tightened with a screwdriver. The torque is insufficient, making it difficult to compress and resulting in poor contact. 3. The molded case circuit breaker adopts two sets of devices for overcurrent and short-circuit protection, and the overcurrent protection action value can be manually adjusted. Mini circuit breakers share a set of devices for overcurrent and short circuit, and the current cannot be adjusted&# 160; 4. Plastic shell circuit breakers have a large distance between phases and are equipped with arc extinguishing covers, which have strong arc extinguishing capabilities and can withstand larger short-circuit currents without easily causing phase to phase short circuits. The lifespan is also long&# 160; 5. The sensitivity of miniature circuit breakers is higher than that of molded case circuit breakers.