Siemens 6EW1380-1AA

Siemens 6EW1380-1AA is an external power supply that provides 24 V DC at up to 4 A, designed for use with SIMATIC S5 control systems. It accepts 220 V single-phase AC input and belongs to Siemens' 6EW family of power supplies. The unit is intended to deliver a dedicated 24 V DC source to support legacy S5 installations, serving as a separate supply for DC loads within the automation cabinet. In Siemens' product catalog, the 6EW1380-1AA is listed as discontinued with no direct replacement offered, and some third-party listings note a potential successor variant (6EW1380-1AB) appearing in the market. Availability today is largely through secondary marketplaces and distributors specializing in legacy Siemens equipment. This part number identifies a high-power, externally mounted supply intended for use in older automation lines where a reliable 24 V DC source remains required, even as new installations move toward modern 24 V or higher-efficiency supplies. Buyers maintaining or refurbishing SIMATIC S5 systems should verify compatibility with their specific module set and wiring harnesses before attempting substitution or procurement, particularly given the discontinued status and potential gaps in official support from Siemens.