Siemens SIRIUS 3RT2028-1AU20 Power Contactor, 38A, 18.5kW, 380V AC Coil, Size S0 Original Brand New

Overview

The Siemens SIRIUS 3RT2028-1AU20 is a high-performance 3-pole power contactor from the globally recognized SIRIUS 3RT2 series, expertly engineered for reliable motor switching and control up to 18.5 kW at 400 V (AC-3/AC-3e duty).

This robust Size S0 contactor features a dependable 380 V AC coil and includes 1 NO + 1 NC auxiliary contacts for seamless integration into complex control circuits. Its industry-standard screw terminal connections ensure secure and straightforward installation, making it the ideal choice for industrial automation and motor control applications.

Benefit

• Exceptional Reliability: Part of the proven Siemens SIRIUS family, ensuring a long mechanical and electrical service life for demanding industrial applications.
• Space Optimization: The compact Size S0 design allows for efficient use of panel space in control cabinets.
• High Power Capacity: Rated for switching up to 18.5 kW (400V), suitable for controlling a wide range of industrial electric motors.
• Easy Integration: Includes integrated 1 NO and 1 NC auxiliary contacts for simple connection to protective devices (like overload relays) and control loops.
• Secure Wiring: Robust screw terminals provide a reliable and durable connection, minimizing maintenance and downtime.

Function and Application

The Siemens 3RT2028-1AU20 contactor is primarily used for switching and controlling 3-phase AC electric motors in applications such as:

1. Motor starting and stopping (Direct-on-line starters).
2. Switching resistive and non-inductive loads.
3. Integration into motor control centers (MCCs).
4. Use in complex automation systems, alongside PLCs and HMI.
5. Operating pumps, fans, conveyors, and machinery where reliable power switching is essential.

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