Siemens SIRIUS 3RT2028-1BB44 Power Contactor 38A, 18.5kW, 24V DC, 2NO+2NC, Size S0 Original Brand New

Overview

The Siemens SIRIUS 3RT2028-1BB44 is a high-performance power contactor designed for reliable switching of motors and other electrical loads. As part of the globally recognized SIRIUS modular system, this contactor combines a compact, space-saving design with robust functionality. It is rated for AC-3e/AC-3 operation, handling currents up to 38 A and motor power up to 18.5 kW at 400 V.

The 24 V DC control voltage offers energy efficiency and versatility in control systems. With its integrated 2 NO + 2 NC auxiliary contacts and a removable auxiliary switch, the 3RT2028-1BB44 provides enhanced flexibility for complex control circuits. The secure screw terminals ensure a stable and maintenance-friendly connection.

Key Features & Benefit

• High Performance: Optimized for AC-3e/AC-3 switching of motors, ensuring reliable and efficient operation.
• Compact Design (Size S0): Saves valuable space within control cabinets, making it ideal for high-density installations.
• Energy-Efficient Control: The 24 V DC operating coil consumes less power, reducing energy costs and heat generation.
• Versatile Auxiliary Contacts: Features 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts, allowing for complex interlocking, signaling, and control functions.
• Removable Auxiliary Switch: Provides flexibility for maintenance and modification of control circuits without disassembling the main contactor.
• Robust & Secure Connections: The screw terminals offer a strong, reliable connection that resists vibrations, ensuring long-term operational stability.
• Part of the SIRIUS System: Seamlessly integrates with other Siemens SIRIUS devices like overload relays and circuit breakers, simplifying system design and maintenance.

Function

The Siemens 3RT2028-1BB44 power contactor functions as an electrically controlled switch used for a variety of applications, primarily the remote control and switching of electric motors. When the 24 V DC control voltage is applied to the coil, it creates an electromagnetic field that pulls the main contacts together, allowing power to flow to the connected load.

Simultaneously, the auxiliary contacts change their state (NO contacts close, NC contacts open), providing feedback and control signals to the automation system. When the voltage is removed, the contacts open, disconnecting the power supply to the load.

Technical Specification

• Product Number: 3RT2028-1BB44
• Operating Current (AC-3e/AC-3): 38 A
• Motor Power (400 V): 18.5 kW
• Control Voltage: 24 V DC
• Number of Poles: 3-pole
• Auxiliary Contacts: 2 NO + 2 NC
• Terminal Type: Screw Terminal
• Size: S0
• Special Feature: Removable auxiliary switch

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