Siemens selectivity module 4 channel sitop pse200u siemens 6ep1961 2ba31 the siemens 6ep1961 2ba31 is a sitop electronic selectivity module from the pse200u range the built in module is for mounting on standard rail din en 60715 35x7515 the 6ep1961 2ba31 has been designed to be connected to stabilised 24v dc power supplies with an output current up to 3athe sitop allows the 24v dc output voltage generated by a stabilised power supply to be split between four load circuits the rated c