QA 1 pole three phase low voltage ac circuit breaker
QA 1 pole three phase low voltage ac circuit breaker is mainly for suitable for overload and short circuit protection. It adopt hydraulic magnetic trip instead bimetal .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 unfrequent switch-over of the circuit and illumination under normal conditions. They are comply with IEC 157-1973, BC4752-1977 and BS 3871 part 1
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