Siemens 3RT2028-2BF44 Power Contactor 3-Pole, 38A, 18.5kW, 400V, 110V DC Coil, Spring Terminal, Size S0 Original Brand New

Overview

The Siemens 3RT2028-2BF44 Power Contactor is a robust, high-performance switching device from the SIRIUS 3RT2 family, designed for reliable operation in motor switching and industrial control applications. This 3-pole contactor is rated for $38\text{ A}$ (AC-3) and a power output of $18.5\text{ kW}$ at $400\text{ V}$. Its $110\text{ V DC}$ operating coil provides precise control, and its innovative spring-loaded terminals ensure fast, vibration-proof, and maintenance-free wiring. The inclusion of $2\text{ NO}+2\text{ NC}$ integrated auxiliary contacts and a size $\text{S0}$ frame makes it a flexible and space-saving solution for control panels.

Key Technical Specification

• Product Number: 3RT2028-2BF44
• Type: Power Contactor (SIRIUS 3RT2)
• Number of Poles: 3-pole
• Rated Operational Current ($\text{Ie}$): $38\text{ A}$ ($\text{AC-3}/\text{AC-3e}$ at $400\text{ V}$)
• Rated Operational Power ($\text{Pe}$): $18.5\text{ kW}$ at $400\text{ V}$
• Control Supply Voltage ($\text{Us}$): $110\text{ V DC}$
• Auxiliary Contacts: $2\text{ NO}+2\text{ NC}$ (Removable auxiliary switch)
• Terminal Type: Spring-loaded terminal
• Size: $\text{S0}$
• Main Application: Switching of three-phase motors and resistive loads.

Functions and Application

The 3RT2028-2BF44 is engineered for high-demand industrial environments.

• Motor Switching: Direct-On-Line (DOL) starting and stopping of three-phase asynchronous motors.
• Resistive Loads: Switching of heating elements and lighting systems.
• Safety and Control Systems: Used in conjunction with overload relays (e.g., SIRIUS 3RU2) for reliable, protected motor feeders.
• Flexibility: The removable auxiliary switch allows for easy configuration and replacement in the field.

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