High-quality molded case circuit breakers adopt high-quality purple copper contacts, flame-retardant engineering plastics and precise arc extinguishing systems. Their rated current and breaking capacity are stably up to standard. They offer precise overload and short-circuit protection, consistent tripping characteristics, low temperature rise, arc resistance, strong insulation performance, high long-term operation reliability, and are suitable for critical scenarios such as industry and power distribution. They have a long warranty period and have passed strict certifications.
The performance of mid-range products basically meets the requirements of civilian power distribution. The materials and processes are of medium quality. The protection accuracy is acceptable. The breaking capacity and durability are average. Long-term high load is prone to heat generation and aging, and the failure rate is slightly higher.
Inferior products often use low-quality copper materials or copper-plated parts, with simple arc-extinguishing structures, falsely marked protection parameters, high risks of tripping failure, failure to operate or false operation, poor flame retardancy, and are prone to cause burning, short circuits or even fires, presenting prominent safety hazards. They are mostly used in temporary or non-critical circuits.