Siemens 3RT2028-2BW40 SIRIUS Power Contactor 38A, 48V DC, S0 Original Brand New

Overview: The Siemens SIRIUS 3RT2 Power Contactor

The Siemens 3RT2028-2BW40 is a high-performance, 3-pole SIRIUS 3RT2 power contactor designed for efficient and reliable switching of motors and other electrical loads in industrial control and automation applications. As part of the SIRIUS modular system, this contactor offers a compact, space-saving design with robust features for worldwide use.

It is specifically rated for 38 A (AC-3e/AC-3) and handles a power rating of 18.5 kW at 400 V. The control circuit operates on a 48 V DC coil voltage, making it ideal for integration with DC-powered control systems and PLCs.

Benefit & Advantages

• Space-Saving Installation: Compact Size S0 design for high-density panel layouts.
• Fast, Vibration-Proof Wiring: Features secure spring-loaded terminals (also known as spring-type terminals) for quick, reliable, and maintenance-free connection, even in high-vibration environments.
• Global Compatibility: Part of the universally approved SIRIUS modular system, climate-proof, and suitable for worldwide installation.
• High Reliability: Exceptional switching performance and mechanical service life (typically 10 million operating cycles).
• Motor Efficiency Ready: Complies with the latest AC-3e/AC-3 standards, making it perfect for switching high-efficiency IE2, IE3, and IE4 motors.
• Direct Control Integration: The 48V DC coil voltage is common for direct connection to PLC outputs and modern electronic control systems.

Function & Application

The 3RT2028-2BW40 contactor is primarily used for switching three-phase motors. Its functions include:

1. Motor Switching: Safely starting and stopping 3-phase AC motors up to 18.5 kW (400V).
2. Motor Protection: Forms the core of a motor starter when combined with an appropriate overload relay (e.g., from the SIRIUS 3RU2 series).
3. Load Switching: Used for switching resistive, inductive, and capacitive loads such as heating elements, lighting systems, and transformers.
4. Control Circuit Integration: The integrated 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts provide feedback and interlocking functionality within the control circuit.

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