QA din rail Hydraulic Magnetic Mini Circuit Breaker is mainly for suitable for overload and short circuit protection. It adopt hydraulic magnetic trip instead bi-metal .So it has a high sensitivity and it is also not effected by the ambient temperature . It is especially used for illumination and distribution in industry and commerce. They are mainly used for overload and short-circuit protection within the circuit of AC 50Hz/60Hz, rated voltage of single pole or double up to 240V, three poles up to 415V. They can also be used for an infrequent switch-over of the circuit and illumination under normal conditions. They are comply with IEC 157-1973, BC4752-1977 and BS 3871 part 1