Block primary switch mode din rail psu single phase psr series block psr 23024 5 block psr 23024 5 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 5 primary switch mode din rail psu 1 phase 22 288 vdc 5a