Siemens 3RT2027-2KB40 Contactor 32A, 15kW, 24V DC, S0 Original Brand New

Overview

The Siemens 3RT2027-2KB40 is a premium component within the SIRIUS modular system for industrial control and automation. Engineered for reliable performance, it offers safe and efficient switching of standard motors up to 15 kW. The 24V DC coil and low power consumption make it an excellent choice for modern control panels, especially where direct interfacing with PLC (Programmable Logic Controller) digital outputs is required. The integrated varistor provides essential protection for sensitive control circuitry.

Benefit

• Maximum Reliability: Integrated varistor drastically reduces coil-related surge voltage peaks, extending component life and protecting control electronics (PLCs).
• PLC Direct Control: Optimized coil for low power draw and reliable pick-up across the voltage tolerance band, making it ideal for direct connection to PLC outputs without intermediate coupling relays.
• Time-Saving Wiring: Spring-loaded terminals ensure quick, simple, and secure connections, significantly reducing installation time and eliminating the need for periodic screw tightening due to vibration.
• Compact Design: The Size S0 frame minimizes panel space requirements, allowing for higher component density in control cabinets.
• Industry Standard: Part of the globally recognized Siemens SIRIUS portfolio, ensuring high quality, availability, and seamless integration with other SIRIUS components.

Function

The 3RT2027-2KB40 Power Contactor functions as an electrically controlled switch, primarily used for remotely controlling the power to electric motors. When the 24V DC coil is energized (typically by a PLC or push button), the magnetic field pulls the main contacts closed, allowing 3-phase power to flow to the motor (AC-3/AC-3e operation).

When de-energized, springs open the main contacts, reliably isolating the motor from the power supply. The 1 NO + 1 NC auxiliary contacts simultaneously change state, providing essential feedback (e.g., to the PLC) indicating the contactor’s current status (on/off).

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