Would you like to know if you can replace your existing SDN 4-24-100P with SDN 4-24-100LP ??
The SolaHD SDN-P DIN Rail power supply SDN 4-24-100P (24VDC at 4Amps/100Watts) is an Obsolete Part (Product is no longer manufactured). Yes, it can be replaced by SDN 4-24-100LP.
The “LP” on the newer version stands for Limited Power. It’s a Class II power supply rated (24VDC at 3.8Amps output/92 Watts). For most applications this should be sufficient; if you are running the old part above 3.8A and 92W as a normal mode of operation you may wish to upgrade to a higher power part for improved overhead margin in your system.