Siemens SIRIUS 3RT2028-1NF30 Power Contactor, 38A, 18.5kW, 95-130V AC/DC, Size S0 Original Brand New

Overview: Siemens SIRIUS 3RT2028-1NF30 Power Contactor

The Siemens SIRIUS 3RT2028-1NF30 is a high-performance, 3-pole power contactor designed for switching motors up to 18.5 kW at 400 V (AC-3e/AC-3). Part of the trusted SIRIUS modular system, this compact Size S0 contactor offers high reliability and robust performance in industrial control applications. Its wide-range solid-state operating mechanism supports a universal control voltage of 95-130 V AC/DC, simplifying inventory and wiring. The integrated varistor provides crucial surge suppression, protecting the coil and control system.

Key Features and Specification

• Product ID (MLFB): 3RT2028-1NF30
• Brand: Siemens SIRIUS
• Type: Power Contactor for Switching Motors
• Performance:
  • Operational Current Ie​: 38 A (at $400\text{ V},\text{ AC-3e/AC-3}$)
  • Operational Power Pe​: 18.5 kW (at $400\text{ V},\text{ AC-3e/AC-3}$)
• Poles: 3-pole main circuit (3 NO main contacts)
• Control Voltage (Coil): 95-130 V AC/DC (50/60 Hz, Wide-Range Solid-State)
• Surge Suppression: Integrated Varistor for coil protection
• Auxiliary Contacts: $1\text{ NO}+1\text{ NC}$ (Integrated)
• Terminal Type: Screw Terminal (Main and Auxiliary Circuits)
• Size: S0 (Compact design)
• Standards: AC-3e / AC-3 compliant.

Benefit & Advantages

• High Reliability & Longevity: Built for a long mechanical service life, typical of the SIRIUS family.
• Reduced Complexity: The wide operating voltage range ($95-130\text{ V AC/DC}$) and integrated varistor simplify ordering and wiring, reducing system complexity.
• Space-Saving Design: The compact Size S0 unit saves valuable space in control cabinets.
• Integrated Features: Auxiliary contacts ($\text{1 NO}+\text{1 NC}$) and surge suppression are built-in, minimizing the need for external components and additional wiring.
• Global Standard: Approved for worldwide use (IEC, UL/CSA, IE3/IE4-ready).

Function / Application

The Siemens 3RT2028-1NF30 is primarily used as a robust and reliable switching device for:

1. Starting, Stopping, and Reversing Three-Phase AC Motors in industrial machinery, pumps, fans, and conveyor systems.
2. Switching Resistive Loads (Heating, lighting).
3. Integration into Load Feeders in combination with SIRIUS thermal overload relays and circuit breakers.

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