Siemens 3RT2037-3AG20 SIRIUS Contactor S2, 65A, 30kW, 110V AC Original Brand New

Overview: Siemens SIRIUS 3RT2 Power Contactor 3RT2037-3AG20

The Siemens 3RT2037-3AG20 is a high-performance, 3-pole power contactor from the SIRIUS 3RT2 modular system, specifically engineered for switching motors and other high-load applications. This Size S2 contactor is rated for $65\text{ A}$ (AC-3e/AC-3 utilization category) and $30\text{ kW}$ at $400\text{ V}$. It features a $110\text{ V}$ AC control voltage coil (50/60 Hz) and is equipped with one normally open ($1\text{ NO}$) and one normally closed ($1\text{ NC}$) integrated auxiliary contact for signaling and control.

A key feature of this model is its dual terminal type: screw terminals for the main power circuit, ensuring a robust connection, and spring-loaded terminals for the control and auxiliary circuits, providing fast, maintenance-free, and vibration-proof wiring.

Benefits & Advantages

1. High Reliability & Performance: Part of the globally recognized SIRIUS modular system, offering proven quality and high contact reliability for switching motors up to $30\text{ kW}$.
2. Flexible Wiring: Combines the secure, high-current capacity of screw terminals for the main circuit with the time-saving and vibration-proof connection of spring-loaded terminals for control circuits.
3. Space-Saving Design: Optimized compact size (S2) allows for efficient use of panel space.
4. Modular Compatibility: Seamlessly integrates with a comprehensive range of SIRIUS components (e.g., overload relays, auxiliary switches) for building complete, factory-tested load feeders.
5. Global Use & Compliance: Climate-resistant and approved for worldwide use (IEC, UL/CSA), making it suitable for international machine building.
6. IE3/IE4 Ready: Optimized for use with high-efficiency motors, ensuring future-proof compliance.

Function

The Siemens 3RT2037-3AG20 is primarily used as a power contactor for remotely and automatically controlling the switching ON and OFF of electrical loads, particularly three-phase AC motors (AC-3e/AC-3 duty).

• Switching Function: Controls the flow of up to $65\text{ A}$ to the motor.
• Coil Control: The $110\text{ V AC}$ coil energizes the contactor, closing the main contacts and operating the integrated auxiliary contacts for feedback and interlocking.
• Auxiliary Contacts ($1\text{ NO}+1\text{ NC}$): Used for interlocking in control circuits, status signaling, and sequential control operations.

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