Block pel 230 series single phase primary switched mode power supply block pel 23024 2 5 the block pel 23024 25 is a primary switch mode din rail power supply that concentrates on the core task of voltage and current supply this single phase psu has a flat step profile optimised for installation in control panels in the building automation block pel 23024 25 din rail power supply 24vdc 25a 60w 1 phase