Siemens 3RT2028-1BF40 SIRIUS Power Contactor, 38A, 18.5kW, 110V DC Coil, 3-Pole, Size S0 Original Brand New

Overview

The Siemens 3RT2028-1BF40 is a high-performance, 3-pole power contactor from the globally recognized SIRIUS 3RT2 series. Engineered for switching and controlling electric motors and other resistive loads in industrial and commercial applications, this compact Size S0 contactor offers outstanding reliability and efficiency.

It features an operating current of 38 A for AC-3/AC-3e applications, a maximum power rating of 18.5 kW at 400 V, and is controlled by a dependable 110 V DC coil. The unit comes equipped with integrated 1 NO + 1 NC auxiliary contacts for control circuit feedback and utilizes robust screw terminals for secure, easy wiring.

Benefit

• High Performance in a Compact Design: Maximum $18.5\text{ kW}$ switching capacity in a space-saving Size S0 frame.
• Reliable Motor Control: Ideal for switching standard three-phase AC motors up to $38\text{ A}$, ensuring safe and efficient operation.
• Integrated Control Logic: Built-in $1\text{ NO}+1\text{ NC}$ auxiliary contacts simplify wiring and provide immediate feedback for interlocking and status indication.
• Versatile Power Application: Suitable for general industrial machinery, HVAC systems, pump, and conveyor controls.
• Secure Connection: Durable screw terminals ensure a solid, long-lasting electrical connection, simplifying installation and maintenance.
• Global Standard: Compliant with major international standards (e.g., IEC) and is IE3/IE4 ready for modern motor efficiency.

Function

The Siemens 3RT2028-1BF40 functions as a remotely controlled electromagnetic switch. Applying the $110\text{ V DC}$ control voltage to the coil energizes it, which magnetically pulls the armature to close the three main power contacts. This connects the main power circuit to the load, typically starting a motor. When the $110\text{ V DC}$ voltage is removed, the contacts open, interrupting the power. The integrated $1\text{ NO}$ (Normally Open) and $1\text{ NC}$ (Normally Closed) auxiliary contacts change state simultaneously, providing signals to the control circuit (e.g., to indicate the motor is running or stopped).

Application

• Switching 3-phase AC electric motors.
• General industrial motor control circuits.
• Heating, ventilation, and air conditioning (HVAC) systems.
• Pump and compressor control.
• Conveyor belt and materials handling systems.
• Building automation and main circuit switching.

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