Siemens SMP-E426-A3 Communication Module

Siemens SMP-E426-A3 is a dual power-supply module for SICOMP/SIMATIC backplane systems that converts 110–220 VAC into four regulated rails to feed logic and peripheral circuits on the same rack. The unit is catalogued as SMPE426A3 with the factory part reference C8451A6A631 (C8451-A6-A63-1 in some listings). It delivers +5 V at up to 10 A, -5 V at up to 0.5 A, +12 V at up to 2 A, and -12 V at up to 2 A, all supplied from a 110–220 VAC input. This module is described as SMP-E426-A3 / SMPE426A3 and is associated with the SICOMP power-supply family used in Siemens industrial control equipment. Intended applications include powering the internal electronics of Siemens controllers and backplane-mounted I/O modules where stable, multi-rail supply is required. Its four regulated rails support a range of vintage or legacy Siemens systems, enabling reliable operation of embedded logic, signal conditioning, and peripheral circuitry within control panels or automation cabinets.