Europa 1 pole rcbos 10ka 30ma b curve din rail mount europa components euc7r321b this 32a 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 10ka 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 euc7r321b single pole rcbo 10ka 30ma b