Ratings and fit for motor control
The Siemens 3RT2028-1BB40-Z W96 is a 3-pole power contactor rated for AC-3e/AC-3 duty at 38 A, which translates to 18.5 kW switching capacity on a 400 V three-phase supply. That AC-3e rating covers the standard motor-starting load — inrush during start, then the running current — so this contactor is sized for a 18.5 kW induction motor at 400 V.
Auxiliary contacts and wiring
Built-in auxiliary contacts are 1 NO + 1 NC, screw terminal type.
The product lifecycle status is Active (current production), so this order code is a standard catalog item — no last-time-buy or phase-out notice applies. RoHS compliance is confirmed since October 2009, and REACH candidate-list information is available. Multi-unit packaging ships 24 pieces per pack; each unit is individually bagged or trayed within the master carton.