Siemens SIRIUS 3RT2018-1BB42 Power Contactor 16A, 7.5kW, 24V DC, 1NC Aux, S00 Original Brand New

Overview: Compact, High-Performance Motor Switching

The Siemens SIRIUS 3RT2018-1BB42 is a high-performance, 3-pole power contactor from the globally recognized SIRIUS modular system, specifically engineered for switching motors up to 7.5 kW (at 400V). Designed for superior reliability and space-saving installation, this Size S00 contactor features a low-power 24 V DC control voltage and integrated 1 NC auxiliary contact. With its robust design and screw terminal connections, the 3RT2018-1BB42 is an ideal component for building efficient and modern industrial load feeders. It supports both AC-3 and the latest energy-efficient AC-3e operating categories, making it an excellent choice for IE3/IE4 ready applications.

Benefits & Features

• Compact Design (Size S00): Maximizes panel space in control cabinets and machinery.
• High Reliability: Part of the SIRIUS modular system, ensuring optimal coordination with other Siemens components (e.g., thermal overloads).
• Energy Efficient Control: The 24V DC coil offers low holding and closing power (typically 4W), reducing energy consumption.
• IE3/IE4 Ready: Optimized for switching the latest generation of highly efficient motors.
• Integrated Auxiliary Contact: Built-in 1 NC contact simplifies wiring and design complexity.
• Flexible Mounting: Supports both screw and snap-on mounting onto 35 mm DIN rail.
• Worldwide Approval: Certified for global use (e.g., IEC, UL/CSA).

Function and Application

The Siemens 3RT2018-1BB42 Contactor functions as the primary switching device in motor control applications. It reliably switches the main current circuit (power to the motor) in response to a low-power control signal (24 V DC) from a PLC or control circuit.

Applications:

• Motor starting and stopping (Direct-on-line starters).
• Switching resistive loads (AC-1 duty).
• Integration into complex control systems and automation processes.
• Creating customized load feeders in combination with SIRIUS 3RU2/3RB3 overload relays.

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