Europa 1 pole rcbos 6ka 30ma b curve din rail mount europa components eub1r401b this 40a 1 pole rcbo is a combination of mcb rcd the unit has a rated residual operating current of 30ma a rated short circuit capacity of 6ka and a b characteristic curve designed for din rail mounting in consumer units and three phase distribution boards and will also retrofit in a consumer unit when the extra protection of an rccb is required europa components eub1r401b single pole rcbo 6ka 30ma b cu