Siemens 3RH2122-1BB40 is a SIRIUS four-pole contactor relay with a 24 V DC coil and a 2 NO + 2 NC contact arrangement, designed to switch motor loads and other high-power circuits in automation systems. It features screw-terminal connections, frame size S00, and a net weight of about 272 g. The control coil operates at 24 V DC, with an ambient operating range of -25 to +60 C and front IP20 protection, making it suitable for standard industrial environments. Rated current is listed at 10 A (AC-1) for the main circuit, and coil power consumption is approximately 4 W at rated voltage.
