Overview
The Siemens SIRIUS 3RT2038-1AU00 is a high-performance, 3-pole power contactor designed for reliable switching of motors and other industrial loads up to 80 A (AC-3e/AC-3 rating). Part of the globally recognized SIRIUS 3RT20 series, this robust Size S2 unit is rated for an operational power of 37 kW at 400 V and features an economical 240 V AC, 50 Hz control coil. It comes equipped with integrated 1 NO + 1 NC auxiliary contacts and secure screw terminals for straightforward wiring. Ideal for motor starter combinations in demanding industrial automation and control panel applications.
Benefit and Advantages
- High Performance: Robustly rated for up to 80 A and 37 kW, suitable for medium-to-high power motor applications.
- Reliable Operation: Part of the proven Siemens SIRIUS industrial controls range, ensuring long mechanical and electrical service life.
- Integrated Flexibility: Comes standard with Normally Open (NO) and Normally Closed (NC) auxiliary contacts, simplifying control circuit wiring and status signaling.
- Secure Wiring: Features easy-to-use and highly reliable screw terminals, a preferred method for secure connections in industrial environments.
- Space-Efficient: The Size S2 design provides a compact footprint for its power rating, optimizing control panel space.
- Global Standard: Conforms to IEC 60947 standards, making it suitable for international industrial use.
Function/Application
The 3RT2038-1AU00 Power Contactor is primarily used for:
- Switching AC Motors: Direct On-Line (DOL) starting, reversing, and speed changing of three-phase squirrel-cage motors.
- Industrial Load Switching: Controlling lighting, heating, power factor correction equipment, and other non-motor loads (AC-1 duty).
- Integration: Forms the core component of motor starter combinations when paired with overload relays (e.g., SIRIUS 3RU2) and circuit breakers.
- Automation Systems: Works seamlessly within automated machinery, production lines, and HVAC systems requiring remote power control.
For more information on the Siemens 3RT2038-1AU00 and to explore our full range of industrial control products, visit Turll today!













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