New electromagnetic contactor

Abstract This paper deals with the design concept and test results of the experimental development phase of a new electromagnetic contactor. The contactor is used for making, switching and breaking of apparatuses and devices at voltage levels up to 1 kV. The use of this contactor will be illustrated in the example of a star-delta starter for induction motors. Currently, starters consist of three contactors, together with its power-, control- and signal connections. An experimental prototype of the new contactor has already been made. Among the tests performed on this prototype are tests for temperature rise limits, dielectric properties and partial tests of mechanical properties. The tests of the rated making and breaking capacities have also been executed. After some constructional modifications, the electromagnetic contactor has successfully passed all the above mentioned tests.