Siemens 3RT2028-2AF04 Power Contactor SIRIUS 3RT2 S0, 38A, 18.5kW, 110V AC, Spring Terminal Original Brand New

Overview

The Siemens 3RT2028-2AF04 SIRIUS 3RT2 Power Contactor is a robust and compact low-voltage industrial switching device designed for switching motors. Part of the highly successful SIRIUS modular system, this size S0 contactor offers high performance and exceptional reliability for a wide range of motor control applications.

Its design is optimized for fast, secure connection using advanced spring-loaded terminals, making installation and maintenance highly efficient. This specific model features $3$-poles for main circuit switching and generous integrated auxiliary contacts ($2\text{ NO}+2\text{ NC}$) for enhanced control and signaling capabilities.

Key Technical Specification

• Product Number: 3RT2028-2AF04
• Contactor Series: SIRIUS 3RT2
• Contactor Size: S0
• Poles: $3$-pole power contactor
• Operational Current (AC-3e/AC-3, $400\text{ V}$): $38\text{ A}$
• Operational Power (AC-3e/AC-3, $400\text{ V}$): $18.5\text{ kW}$
• Control Supply Voltage (Coil Voltage): $110\text{ V AC},50\text{ Hz}$
• Auxiliary Contacts: $2\text{ NO}+2\text{ NC}$ (Integrated, Removable)
• Terminal Type: Spring-loaded terminal for control and main circuits
• Motor Rating Compatibility: IE3/IE4-ready

Benefit

• Fast & Secure Wiring: The spring-loaded terminal technology provides vibration-proof, maintenance-free connections, significantly reducing wiring time compared to screw terminals.
• High Reliability: Built on the proven SIRIUS platform, ensuring a high contact reliability and long electrical service life.
• Space-Saving Design: Its compact Size S0 construction allows for efficient use of panel space in electrical enclosures.
• Simplified Design & Inventory: Integrated $2\text{ NO}+2\text{ NC}$ auxiliary contacts and a removable auxiliary switch reduce the need for separate components and streamline stock management.
• Global Standard Compliance: Approved for worldwide use (e.g., IEC and UL/CSA), making it suitable for international machine builders and system integrators.
• IE3/IE4 Ready: Optimized for switching modern, high-efficiency motors, supporting current energy efficiency standards.

Function & Application

The Siemens 3RT2028-2AF04 is primarily used as a motor contactor for switching $3$-phase AC motors. It is the central switching element in a load feeder, designed to handle high-current inductive loads (AC-3 and the enhanced AC-3e efficiency class).

• Function: Remote switching and control of electric motors, heating, lighting, and other loads in industrial automation, control systems, and machinery.
• Typical Applications: Pump control, fan operation, conveyor systems, machine tools, and general industrial load switching requiring reliable power control.

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