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3RT2028-1BB44-3MA0 - power contactor, AC-3e/AC-3, 38 A, 18.5 kW / 400 V, 3-pole, 24 V DC, auxiliary contacts: 2 NO + 2 NC, screw terminal, size: S0, captive auxiliary switch
QBM4100-1D SIEMENS Air duct differential pressure sensor
Analog monitoring relay Phase sequence monitoring 3 x 320...500 V 50...60 Hz AC 2 change-over contacts screw terminal