3RT20181FB443MA0

The 3RT2018-1FB44-3MA0 belongs to the Siemens SIRIUS 3RT2018 series S00 frame contactor. It has an AC-3 rated current of 16A and can handle a 7.5kW/400V three-phase motor load. Its frame size is more compact than the 3RT2023. The difference between it and the BB code models in the same series lies in the coil circuit: the FB code indicates that a diode suppression circuit is integrated into the coil at the factory. This effectively absorbs the back electromotive force generated when the coil is de-energized, reducing electrical interference to surrounding electronic components (such as PLC output points), making it particularly suitable for use in noise-sensitive control systems. The auxiliary contacts and coil suppression circuit are also permanently integrated into the body with the -3MA0 code.