Available in the following current ratings 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A and 63A with a maximum working voltage of 450V All MCB's are D curves, as this is the characteristic that we recommend for transformers These MCB'S can be fitted to any of our enclosed transformer, free of fitting charge.Available in the following current ratings