Block powervision din rail power supply single and 3 phase block pvsb 40024 20 the block pvsb 40024 20 is a din rail 3 phase primary switched mode power supply from blocks economy powervision pvsb 400 series with high power reserves for all automation requirements and a variety of parameter setting and display functions including output current and output voltage monitoring block pvsb 40024 20 powervision din rail power supply 24vdc 20a 480w 3 phase