Siemens SIRIUS 3RT2027-1KA40 Power Contactor, 32A, 15kW, 12V DC Coil, 1 NO + 1 NC Aux, S0 Frame Original Brand New

Overview

The Siemens SIRIUS 3RT2027-1KA40 is a high-performance, 3-pole power contactor designed for switching motors and other loads up to 32 A (AC-3e/AC-3 rating) and 15 kW at 400 V. This contactor is part of the SIRIUS 3RT2 series and is engineered for use in demanding industrial environments.

It features a reliable 12 V DC coil with an operating range of 0.7−1.25×Uc​ (control supply voltage) and comes standard with a plugged-in varistor for enhanced surge protection of the coil. The compact frame size S0 saves space in control cabinets, making it an ideal component for system integration, particularly when controlled by PLC outputs.

Key Benefit

• Optimized for PLC Control: The low-power 12 V DC coil and integral surge protection make it perfectly suited for direct operation by Programmable Logic Controller (PLC) outputs.
• Space-Saving Design: The Frame Size S0 ensures a compact footprint, allowing for higher component density within your control panel.
• High Reliability: Built with Siemens quality, it offers a robust and dependable solution for motor and load switching applications.
• Enhanced Coil Protection: Includes a factory-fitted plugged-in varistor to protect the coil and associated control circuitry from voltage spikes.
• Simple Installation: Features sturdy screw terminals for secure and straightforward wiring.

Function and Technical Specification

The 3RT2027-1KA40 serves as an essential switching element in automation and control systems. Its primary function is the reliable make and break of an electric circuit under normal operating conditions.

• Product Number: 3RT2027-1KA40
• Type: Power Contactor (AC-3e/AC-3)
• Poles: 3-pole
• Rated Current (Ie​): 32 A
• Rated Power (400V): 15 kW
• Control Coil Voltage (Us​): 12 V DC
• Coil Operating Range: 0.7−1.25×Uc​
• Surge Protection: Plugged-in varistor included
• Auxiliary Contacts: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Connection Type: Screw Terminal
• Frame Size: S0
• Note: No auxiliary switch block can be subsequently added to this model.

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