3RF2120-1AA04 NEW ORIGINAL

The Siemens 3RF2120-1AA04 is a single-phase SIRIUS 3RF2 solid-state relay designed for wear-free, noiseless switching of resistive and inductive AC loads. Rated at 20 A (AC-51) with a 48–460 V AC operating voltage range, it is controlled by a 15–24 V DC signal and uses screw terminals for main circuit connections. Unlike electromechanical relays, this solid-state device has no moving parts, making it ideal for high-switching-frequency applications and noise-sensitive environments. The compact 22.5 mm width saves valuable space, and the unit can be expanded with standardized 3RF29 function modules for load monitoring, power regulation, or terminal covers.