Siemens 3RT2024-1BB40 Three-Phase Power Contactor

Siemens 3RT2024-1BB40 is a three-pole power contactor from the Sirius 3RT2 family that uses a 24 V DC coil to switch a three-phase load designed for AC-3e/AC-3 duty. The main contacts are rated for 12 A and up to 5.5 kW at 400 V, making it suitable for starting and stopping small to mid-sized three-phase motors in industrial control panels. This model includes one normally open and one normally closed auxiliary contact (NO/NC) for feedback or interlock circuits, and wires to screw terminals; it is specified as size S0 with upright mounting, emphasizing a compact footprint. The compact form factor and 24 V DC coil reduce control power requirements while maintaining robust switching performance in demanding environments. The 3RT2024-1BB40 integrates with compatible overload relays and control logic within Siemens Sirius motor control hardware to form reliable starter assemblies in panel installations.