JVA5 Series has high sensitive short circuit and overload protection functions, and is suitable for power distribution systems in factories, businesses and residential buildings, and protects matching power equipment. The utility model has the advantages of strong breaking ability, large capacity, high sensitivity, good reliability, long service life, convenient replacement, etc. Mainly suitable for AC 50/60Hz, single-phase 230V, in three-phase or four-wire 440V circuit in overload and short-circuit protection. At the same time, they are also used for switching switches under normal conditions. The product is designed and manufactured according to IEC 60898 and IEC 60947 standards.