Siemens 3RT2028-2BB40 Power Contactor, 38A, 3-Pole, 24V DC, 18.5kW, 1NO+1NC Auxiliary Contacts Original Brand New

Overview

The Siemens 3RT2028-2BB40 is a high-performance power contactor engineered for reliability, efficiency, and long-term operation in industrial and commercial applications. Designed for AC-3/AC-3e utilization categories, it handles motor loads up to 18.5 kW at 400 V and 38 A, making it ideal for demanding switching tasks.

It features a 24 V DC coil, spring-loaded terminals, and integrated 1 NO + 1 NC auxiliary contacts for flexible control configurations. Compact in design (size S0), this 3-pole contactor is built to integrate seamlessly into control panels and automation systems.

Key Benefit

• Reliable Motor Switching: Supports AC-3/AC-3e applications up to 18.5 kW at 400 V.

• Efficient Design: Compact size S0 reduces panel space.

• Quick Installation: Spring-loaded terminals simplify wiring.

• Versatile Control: Built-in 1 NO + 1 NC auxiliary contacts offer flexible control logic.

• Durable and Safe: Engineered by Siemens for high electrical endurance and operational safety.

Function and Typical Application

The Siemens 3RT2028-2BB40 Power Contactor is the essential electromechanical switch used for safely and reliably connecting and disconnecting three-phase electrical loads.

Primary Functions:

1. Motor Switching: Controls the ON/OFF operation of 3-phase electric motors (e.g., pumps, fans, conveyors).
2. Load Control: Switches other non-motor loads like lighting, heating elements, and power supplies.
3. Automation Interface: The low-voltage DC coil allows for direct control from PLC modules, HMI systems, and automated industrial controls.