Siemens 3RT2028-1BJ80 SIRIUS Power Contactor, 38A, 18.5kW, 72V DC, Size S0 Original Brand New

Overview: The Siemens 3RT2028-1BJ80 SIRIUS Innovation

The Siemens 3RT2028-1BJ80 is a high-performance power contactor from the globally recognized SIRIUS line, designed for demanding industrial switching applications. This essential electrical component is rated for AC-3e/AC-3 operation, handling currents up to 38 A and motor loads up to 18.5 kW at $400\text{ V}$.

It features a robust 3-pole main circuit and is specifically equipped with a low-power $72\text{ V DC}$ operating coil. Ideal for integration into modern control systems, this contactor offers exceptional reliability and efficiency. Its compact Size S0 footprint allows for space-saving installation, and the reliable screw terminals ensure secure wiring.

Key Benefit

• High Performance: Efficiently controls motor loads up to $18.5\text{ kW}$ (at $400\text{ V}$) with a $38\text{ A}$ current rating, suitable for both standard AC-3 and enhanced AC-3e efficiency classes.
• DC Coil Efficiency: Operates using a $72\text{ V DC}$ coil, often preferred for battery-backed or low-voltage control circuits, ensuring low power consumption and reliable switching.
• Integrated Signaling: Includes built-in auxiliary contacts ($1\text{ NO}+1\text{ NC}$) for clear status indication and seamless integration into interlocking or monitoring circuits.
• Durable and Compact: Built to the Siemens standard of quality in the space-saving Size S0, minimizing panel real estate requirements.
• Secure Wiring: Utilizes user-friendly and reliable screw terminals for straightforward installation and maintenance.

Function

The 3RT2028-1BJ80 contactor functions as an electrically controlled switch, primarily used for switching motor loads (starters, pumps, fans) and resistive loads in industrial and commercial installations. When $72\text{ V DC}$ is applied to the coil, it electromagnetically closes the main $3$-pole contacts, allowing power (up to $38\text{ A}$) to flow to the load. The auxiliary contacts simultaneously change state ($1\text{ NO}$ closes, $1\text{ NC}$ opens) to provide feedback to the control system or for interlocking purposes.

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