Siemens 3RT2027-2KF40 Power Contactor, 32 A, 15 kW, 110 V DC Coil, S0 Frame Original Brand New

Overview

The Siemens 3RT2027-2KF40 is a high-performance, 3-pole power contactor designed for industrial applications. It is engineered to reliably switch and control electrical loads up to 32 A (AC-3e/AC-3) and 15 kW at 400 V. This model stands out with its 110 V DC coil, which operates within a wide control supply voltage range of 0.7 to 1.25 times the rated voltage (Uc​), ensuring reliable operation even with voltage fluctuations. The integrated, plugged-in varistor provides essential protection against switching overvoltages, making it highly suitable for sensitive PLC outputs.

This contactor belongs to the compact S0 frame size, saving valuable panel space while delivering robust performance. It features a user-friendly design with spring-loaded terminals for fast, secure, and maintenance-free wiring, significantly reducing installation time. With 1 normally open (1 NO) and 1 normally closed (1 NC) auxiliary contacts, it provides essential feedback and control capabilities for your automation circuits. Please note that this specific model does not allow for the addition of further auxiliary switches.

Key Features & Benefit

• High Performance: Rated for 32 A and 15 kW (at 400 V), it handles demanding electrical loads with ease.
• Ideal for PLC Integration: The 110 V DC coil and built-in varistor make it perfectly suited for direct control by PLC outputs, protecting sensitive electronics from voltage spikes.
• Space-Saving Design: The compact S0 frame size minimizes the footprint in control cabinets, allowing for more efficient use of space.
• Fast and Secure Wiring: Spring-loaded terminals offer a vibration-proof connection, reducing installation time and eliminating the need for periodic screw tightening, saving maintenance costs.
• Integrated Overvoltage Protection: The pre-installed varistor protects the coil and surrounding equipment from voltage surges, enhancing system reliability and longevity.
• Essential Auxiliary Contacts: Comes equipped with 1 NO + 1 NC auxiliary contacts for seamless integration into control and feedback loops.
• Wide Voltage Tolerance: Operates reliably with a control voltage range of 0.7 to 1.25*Uc​, accommodating voltage variations in the power supply.

Function

The Siemens 3RT2027-2KF40 power contactor functions as an electrically operated switch. When the 110 V DC control coil is energized, it generates an electromagnetic force that pulls the main contacts into a closed position, allowing power to flow to the connected load (e.g., an electric motor). When the control voltage is removed, the spring-loaded contacts return to their open position, de-energizing the load.

The auxiliary contacts simultaneously switch state to provide feedback on the contactor’s status to the control system. The integrated varistor safely dissipates excess energy during switching, preventing damaging voltage spikes.

Technical Specification

• Product Number: Siemens 3RT2027-2KF40
• Type: Power Contactor
• Rated Operational Current: 32 A (AC-3e/AC-3)
• Rated Operational Power: 15 kW (at 400 V)
• Number of Poles: 3
• Coil Control Voltage: 110 V DC
• Coil Operating Range: 0.7 – 1.25*Uc​
• Auxiliary Contacts: 1 NO + 1 NC
• Terminal Type: Spring-loaded
• Frame Size: S0
• Overvoltage Protection: With plugged-in varistor
• Compatibility: Suitable for PLC outputs
• Note: No auxiliary switch can be added

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