Siemens SIRIUS 3RT2027-1KB40 Power Contactor, S0, 32A, 15kW/400V, 24V DC, 1NO+1NC, Screw Terminal Original Brand New

Overview: High-Performance Power Contactor for Motor and Control Applications

The Siemens SIRIUS 3RT2027-1KB40 is a robust and compact 3-pole power contactor from the SIRIUS 3RT2 series, size S0, engineered for reliable switching of motors and control circuits. It is specifically designed with a 24V DC control voltage and an integrated varistor, making it ideal for direct control from modern PLC (Programmable Logic Controller) outputs.

With a rated operational current of 32 A for AC-3/AC-3e and a motor power rating of 15 kW at 400 V, this contactor offers excellent performance in industrial automation and control environments. Its built-in auxiliary contacts (1 NO + 1 NC) and convenient screw terminals simplify wiring and integration.

Key Features and Function

• Model Number: 3RT2027-1KB40
• Series: SIRIUS 3RT2, Size S0
• Application: Power switching of motors (AC-3e/AC-3) and control circuits.
• Main Contacts: 3-pole
• Operational Current (Ie​): 32 A (at 400 V, AC-3/AC-3e)
• Motor Power Rating: 15 kW (at 400 V)
• Control Coil Voltage: 24 V DC
• Control Range: 0.7 to 1.25 times the rated control supply voltage (Uc​)
• Integrated Protection: Features a plugged-in varistor for surge suppression, protecting the coil from voltage peaks, especially beneficial when controlled by sensitive electronics like PLCs.
• Auxiliary Contacts: 1 Normally Open (NO) and 1 Normally Closed (NC) integrated auxiliary contact for signaling and control logic.
• Termination Type: Reliable screw terminals for the main and auxiliary circuits.
• PLC Compatibility: Suitable for direct actuation from PLC outputs due to its DC coil with an integrated varistor and specific operating range.
• Design Note: The frame size S0 version does not allow for the addition of further auxiliary switch blocks.

Benefit

• PLC-Ready Integration: Optimized 24V DC coil with varistor for reliable interfacing with PLC systems, reducing component count and wiring complexity.
• High Performance: Capable of handling up to 15 kW motors at 400 V, providing strong switching capability for demanding applications.
• Space-Saving Design: Compact S0 frame size helps to minimize panel space requirements.
• Enhanced Reliability: Integrated surge suppression (varistor) extends the coil’s lifespan and protects the control system.
• Simplified Wiring: Screw terminals provide a secure and straightforward connection method.
• Safety and Standards: Conforms to international standards, ensuring safe and reliable operation in industrial settings.

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