Siemens 3RT2037-3AC20 SIRIUS Power Contactor S2, 65A, 24V AC Original Brand New

Siemens SIRIUS 3RT20 Power Contactor – 3RT2037-3AC20 (Size S2, 65A, 30kW)

The Siemens 3RT2037-3AC20 is a high-performance SIRIUS 3RT20 power contactor designed for reliably switching motors and other resistive loads. As part of the SIRIUS modular system, this size S2 contactor offers a compact design combined with high operational safety and a long mechanical service life (typically 10 million operating cycles).

This specific 3-pole contactor is rated for $65\text{ A}$ (AC-3e/AC-3) and is suitable for switching standard motors up to $30\text{ kW}$ at $400\text{ V}$. Its control circuit operates on a $24\text{ V AC}$, $50/60\text{ Hz}$ coil voltage, ensuring compatibility with standard industrial control systems.

A key feature is the mixed terminal configuration: the main power circuit uses robust screw terminals for secure connection of heavy-gauge wires, while the control and auxiliary circuits utilize convenient spring-loaded terminals for fast, vibration-proof, and maintenance-free wiring of control signals.

Function

• Motor Switching: Controls the switching of 3-phase AC motors up to $30\text{ kW}$.
• Load Switching: Suitable for switching resistive and mildly inductive loads (AC-1/AC-3e/AC-3 applications).
• Control Integration: Acts as the power interface between the control system ($24\text{ V AC}$) and the main load circuit.
• Signaling: The integrated $1\text{ NO}+1\text{ NC}$ auxiliary contacts provide status feedback to the control system (e.g., PLC, relay).

Benefit

• Reliable Performance: High contact reliability and a long mechanical life (10 million switching cycles) reduce maintenance and downtime.
• Flexible Wiring: Combines the robustness of screw terminals for main power connections with the speed and maintenance-free nature of spring-loaded terminals for control wiring.
• Compact Design: The size S2 footprint allows for efficient use of space in control cabinets and panels.
• Worldwide Usability: Meets major international standards and certifications (e.g., IEC, UL/CSA), making it suitable for global applications.
• IE3/IE4 Ready: Optimized for use with high-efficiency IE3 and IE4 motors.

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