Siemens 3RT1024-1B Contactor

Siemens 3RT1024-1B Sirius power contactor is a compact 3-pole motor starter designed to switch AC motors and resistive loads in control panels. It uses a captive DC 24 V coil and comes in the Size S0 footprint with screw terminals, enabling straightforward panel installation and reliable wiring in tight spaces. The device provides three main poles for the load path and includes a built-in auxiliary contact block with 2 normally open and 2 normally closed contacts for control circuits and interlocking. Rated for AC-3 duty, it can switch up to 5.5 kW at 400 V and approximately 12 A, making it suitable for starting medium-sized three-phase motors in automation applications. The 3RT1024-1BB44-3MA0 variant confirms the 24 V DC coil and 2 NO + 2 NC auxiliary contacts, aligning with Siemens Sirius motor-control products and ensuring compatibility with other Sirius accessories in OEM panels. This model is well-suited for panel builders and machine builders needing a dependable, space-efficient starter with robust current handling and flexible wiring options.