Erica Fusion modules have insignificant (max 15mA) power consumption from eurorack power supply unit(PSU), but they require separate, easy to install 6VAC PSU for tube heaters. Erica Fusion 6VAC PSU is designed to power up to 7 Erica Fusion modules. When ordering, please make sure, you select a Fusion PSU that is configured for the voltage in your country.