Siemens 3RH2122-1BB40 is a four-pole electromechanical contactor relay with a 24 V DC coil, offering two normally open and two normally closed contacts in frame size S00. It uses screw terminals and is designed for upright mounting in control panels, providing a compact option for 24 V control circuits. Rated for 10 A of load current, this 3RH2 device is used to switch moderate loads in automation circuits and is part of Siemens’ 3RH2 family of contactors.
