Siemens 3RT2037-1KB44 Power Contactor SIRIUS 3RT2, 65A, 24V DC Original Brand New

Siemens 3RT2037-1KB44 SIRIUS 3RT2 Power Contactor

The Siemens 3RT2037-1KB44 power contactor from the SIRIUS 3RT2 series is a robust and high-performance switching device designed for motor control and general industrial applications. Rated for up to 65 A in AC-3/AC-3e duty and capable of handling 30 kW at 400 V, this contactor delivers reliable operation in demanding environments.

Overview & Key Specification

This specific model features a highly efficient 24 V DC control coil with an operating range of 0.8−1.2⋅Uc​. Crucially, it comes standard with an integrated varistor, ensuring surge suppression and increased lifespan for the control electronics, making it perfectly suitable for PLC outputs and sensitive solid-state control.

• Product ID: 3RT2037-1KB44
• Contactor Size: Frame Size S2
• Rated Operational Current (AC-3/AC-3e): 65 A
• Rated Power: 30 kW / 400 V
• Main Poles: 3-pole
• Control Voltage: 24 V DC (with integrated varistor)
• Auxiliary Contacts: 2 NO + 2 NC integrated
• Connection Type: Screw Terminal

Benefit

Choosing the Siemens 3RT2037-1KB44 offers several advantages for modern industrial automation:

• Reliable Protection: The integrated varistor provides superior surge protection for the 24V DC coil, reducing stress on PLC outputs and minimizing downtime.
• High Switching Capacity: The 65A current rating and 30kW power handling make it ideal for starting and controlling medium-sized three-phase motors.
• Simplified Installation: Standardized Frame Size S2 allows for easy integration into existing control panels. The screw terminals offer a secure and familiar wiring method.
• Automation Ready: With its DC coil and specialized design, this contactor is specifically engineered to be suitable for PLC outputs, ensuring seamless integration into automated systems.
• Integrated Monitoring: The pre-installed 2 NO + 2 NC auxiliary contacts provide immediate feedback on the contactor status, simplifying wiring for control and monitoring circuits.

Application and Function

The 3RT2037-1KB44 is primarily used for switching resistive and highly inductive loads, such as:

• Starting and stopping three-phase motors (Direct On Line/DOL starters).
• Switching heating elements and lighting loads.
• Integration into complex control systems where reliable switching via 24V DC from a PLC is required.

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