Block din rail primary switched mode power supply block pm 0124 040 1 the block pm 0124 040 1 is a din rail mountable primary switched mode power supply in a slim plastic housing this single phase psu is powerful and flexible light and compact the power supply is suitable for a highly diverse range of applications in solar measurement and control technology as well as industrial and building automation the power supply also complies with the en 60335 1 standard for domestic appliances t