Siemens 3RT2018-1BB44-3MA0 Power Contactor, 16A, 7.5kW, 24V DC, 3-Pole, S00 Original Brand New

Overview

The Siemens SIRIUS 3RT2018-1BB44-3MA0 is a high-performance, compact power contactor designed for switching three-phase motors and other resistive or inductive loads up to 16 A (AC-3e/AC-3). Part of the globally successful SIRIUS modular system, this device combines excellent electrical performance with a space-saving design (Size S00).

It features a robust 24V DC operating coil for reliable control and includes a full complement of integrated auxiliary contacts (2 NO + 2 NC) for signaling and interlocking functions. The secure screw terminals ensure easy and reliable wiring. This contactor is engineered for high operational reliability and long mechanical service life, making it a dependable component for any industrial control panel or motor starter assembly.

Benefits & Key Features

• Compact High Performance: The size S00 design allows for maximum power density (7.5 kW) in minimal panel space.
• DC Coil Efficiency: The 24V DC coil provides reliable and consistent switching performance.
• Integrated Signaling: Equipped with a captive 2 NO + 2 NC auxiliary switch block, reducing the need for separate accessories and simplifying wiring.
• High Contact Reliability: Part of the SIRIUS 3RT2 range, known for prolonged endurance and safe switching operations.
• Versatile Application: Ideal for switching standard (AC-3) and highly efficient motors (AC-3e, IE3/IE4 ready).
• Global Compliance: Approved worldwide, meeting major standards such as IEC and UL/CSA.
• Easy Wiring: Secure and robust screw terminals for main and control circuits.

Function

The Siemens 3RT2018-1BB44-3MA0 functions as an electromagnetically operated switch. When the 24V DC coil is energized, it closes the three main power contacts, allowing current to flow to the connected load (e.g., an electric motor). Simultaneously, the integrated 2 NO and 2 NC auxiliary contacts change state, providing feedback or enabling interlocking in the control circuit. This contactor is primarily used in control systems to reliably turn electric motors and other industrial equipment on and off.