The Siemens 3RA1120-0CD23-0BB4 is a nonreversing combination starter in the SIRIUS S0 frame, rated for 0.18-0.25 A with a 110 VDC control voltage. It integrates a motor starter protector (MSP) and contactor in one Fastbus-mount package, saving panel space and wiring time compared to separate components. The 0.18-0.25 A range means it's sized for small motor loads — think fractional-horsepower pumps, fans, or conveyors — where a single device handles short-circuit and overload protection plus switching.
The 110 VDC control voltage is the coil rating — verify your control supply matches before wiring. The 0.18-0.25 A current range is the motor full-load current setting on the overload relay, not the contactor's thermal rating; set it to the nameplate FLA of the motor.