Siemens SIRIUS 3RT2 Power Contactor 3RT2037-1KB40-1AA0, 65A, 30kW, 24V DC Coil, S2 Frame Original Brand New

Overview

The Siemens 3RT2037-1KB40-1AA0 is a high-performance, $3$-pole SIRIUS 3RT2 Power Contactor designed for reliable switching of $AC-3e/AC-3$ loads, specifically for motors up to $30\text{ kW}$ at $400\text{ V}$. This robust contactor is part of the compact SIRIUS modular system, offering superior operating reliability and a long lifespan for industrial applications.

It features a $24\text{ V DC}$ operating coil with an extended operating range (0.8−1.2⋅Uc​) and an integrated varistor, ensuring coil protection and reliable operation, especially when controlled directly by sensitive devices like PLC outputs. The size S2 frame and secure screw terminals provide easy integration and connection.

Benefit

• Optimized for PLC Systems: The $24\text{ V DC}$ coil with integrated varistor makes it highly suitable for direct control via sensitive PLC outputs, minimizing external protection requirements.
• High Performance: Handles up to $65\text{ A}$ and $30\text{ kW}$ motor loads, providing reliable switching capability.
• Space-Saving Design: The compact S2 frame size helps optimize panel space in control cabinets.
• Enhanced Reliability: Built-in varistor surge suppression protects the coil and extends the lifespan of the control circuit components.
• Easy Integration: Standardized design and screw terminals simplify wiring and installation for electricians and engineers.

Function

The Siemens 3RT2037-1KB40-1AA0 is primarily used to switch $3$-phase AC loads, such as electric motors, by using a low-power $24\text{ V DC}$ control signal from a PLC or control circuit.

1. Motor Switching: Closes the $3$-pole main circuit to supply power to a motor for ON/OFF operation.
2. Control Circuit Feedback: The $1\text{ NO}$ (Normally Open) and $1\text{ NC}$ (Normally Closed) auxiliary contacts provide essential status feedback to the control system (e.g., PLC input) and can be used for interlocking or signaling.
3. Surge Protection: The integrated varistor safely dampens voltage peaks (surges) on the control coil, a crucial feature for DC coils, especially when switched by electronic outputs.

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