Siemens 6EP1961-3BA21 Redundancy Power Supply Module

Siemens 6EP1961-3BA21 SITOP PSE202U Redundancy Module is a 24 V DC redundancy accessory that sits between two SITOP power supplies and the load to deliver a combined 24 V output of up to 40 A (20 A per supply). This model is part of the SITOP Redundancy Module family and is designed specifically to decouple two SITOP power supplies, enabling independent operation of each supply with a shared load up to 40 A total. The module's input/output specification is 24 V DC / 40 A, and it provides SELV protection per EN 60950-1 with a relay contact for signaling. It is intended for use with SITOP PSE202U configurations, providing reliable 24 V DC power for industrial automation hardware such as PLCs, sensors, and actuators that require dual-power-source redundancy. The 6EP1961-3BA21 designation uniquely identifies this redundancy module among Siemens' SITOP accessories, ensuring compatibility with SITOP power supply setups that use the PSE202U redundancy scheme.