Slim miniature circuit breakers Ex9B40J are devices suitable for domestic as well as commercial applications. The 3/4 module width - 13.5mm width per pole instead of 18mm of regular devices, makes this series the best option for space demanding installations. It has been preserved the internal structure of the regular Ex9B product family in the slim miniature circuit breakers, making the Ex9B40J full compatible with the accessories of the regular circuit breakers: shunt trip releases, undervoltage and overvoltage releases, auxiliary contacts and alarm contacts. It can be used up to three units of auxiliary or alarm contacts plus up to two release units.