U_m_p_a_4x18 May 2026

This denotes the physical footprint. In most industrial contexts, this means the component occupies 4 vertical units of space and has a depth or width of 18 inches/units . Common Applications

These typically stand for Modular , Power , and Assembly/Adapter , depending on the manufacturer (often seen in telecommunications or power distribution). U_M_P_A_4x18

Ensure your rack rails are compatible with a 4U height. If using an 18-inch depth, check that your cabinet has enough rear clearance for cabling. This denotes the physical footprint