Siemens 3RT2028-2AC24 Power Contactor AC-3e/AC-3, 38A, 18.5kW, 24V AC Coil, 2 NO + 2 NC Aux Original Brand New

Overview

The Siemens 3RT2028-2AC24 is a high-performance power contactor from the robust SIRIUS line, designed for superior efficiency in switching and controlling motors and other electrical loads up to 18.5 kW at 400 V. Classified for both AC-3 and the energy-efficient AC-3e applications, this 3-pole contactor offers reliability and longevity in demanding industrial environments. It features spring-loaded terminals for fast, vibration-proof wiring and comes in a compact Size S0 for space-saving panel integration.

Key Features & Technical Specifications

• Product Number: 3RT2028-2AC24
• Type: Power Contactor (SIRIUS)
• Application: AC-3e / AC-3 (Motor Switching)
• Rated Current (AC-3/AC-3e): 38 A
• Motor Power (400V): 18.5 kW
• Number of Poles: 3-pole
• Coil Voltage: 24 V AC, 50/60 Hz
• Auxiliary Contacts: Integrated $2\text{ NO}+2\text{ NC}$ (Normally Open + Normally Closed)
• Terminal Type: Spring-loaded terminal (Spring-type)
• Size: S0
• Special Feature: Removable auxiliary switch block

Benefit

• Reliable Performance: Rated for both standard (AC-3) and premium energy-efficient (AC-3e) switching, ensuring consistent motor control and compliance with modern energy standards.
• Fast, Secure Wiring: Spring-loaded terminals eliminate the need for re-tightening screws, drastically reducing installation time and offering high vibration resistance for increased operational safety.
• High Flexibility: The $2\text{ NO}+2\text{ NC}$ auxiliary contact configuration allows for complex control and signaling circuits right out of the box.
• Space-Saving Design: The compact Size S0 form factor helps reduce panel size and material costs.
• Ease of Maintenance: The removable auxiliary switch simplifies modifications and troubleshooting without needing to access the main terminals.

Function

The Siemens 3RT2028-2AC24 serves as a primary switching device to remotely turn on and off a three-phase motor or electrical heating system.

1. Motor Switching: Safely connects and disconnects the load to the power supply up to $18.5\text{ kW}$.
2. Control Integration: The $24\text{ V AC}$ coil allows for easy integration into low-voltage control circuits, PLCs, or relay systems.
3. Feedback/Interlock: The $2\text{ NO}+2\text{ NC}$ auxiliary contacts provide status feedback to the control system and can be used for electrical interlocking mechanisms.

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