Siemens 3RT1054-3AP36 3RH1921-2DA11 Contactor

The Siemens 3RT1054-3AP36 contactor functions as a critical electromechanical switching device engineered for industrial automation, specifically utilizing the auxiliary contact block with the designated part number 3RH1921-2DA11 to enable signal feedback or interlocking within the wider control loop and external monitoring systems. Operating parameters require a constant electrical potential between 220 and 240 volts alternating current applied to the control coil, with tolerance for both 50Hz and 60Hz input frequencies to align with varying power supply standards found in international facilities. Technicians mount this assembly primarily in motor control centers or machine frames where reliable electrical disconnect capabilities are essential for managing the power feed to motors and other three-phase loads connected to the downstream apparatus. Accurate selection of this OEM part number prevents compatibility errors during retrofits, ensuring terminal geometry and electrical characteristics remain synchronized with the designed schematic for optimal panel efficiency and adherence to system safety protocols used by maintenance staff during servicing intervals.