Block primary switch mode din rail psu single phase psr series block psr 23024 1 3 block psr 23024 13 is a single phase primary switched mode power supply from the psr 230 range the power supply is a voltage regulated unit and ideal for use for applications in information technology it automation process and control technology block psr 23024 13 primary switch mode din rail psu 1 phase 22 288 vdc 13a