We have developed a new series - BSE - of single-phase control transformers with two standard input voltages as 230 V and 400 V taps. Here the user has the option of using the transformer with either 230 V or 400 V input voltage, which saves storage space and costs. Thanks to the combined top-hat rail mounting up to a power rating of 250 VA, installation is also quick and easy. The output voltage can be selected between 24 V and 230 V. The power ratings range from 50 VA to 800 VA.