10 digital input/output expansion module - 24Vac power supply The SR3XT101B expansion module manufactured by Schneider Electric allows you to increase the number of digital and relay inputs and outputs of your Zelio logic controller. Please note, this input/output module is only compatible with modular Zelio Logic controllers. Compact models cannot accommodate extensions. Power supply voltage: 24Vac Total additional inputs and outputs: 10 Additional digital inputs: 6 Additional relay outputs: 4