Siemens SIRIUS 3RT2037-3KB40 Power Contactor, 65A, 30kW, 24V DC, Varistor, Spring-Loaded Terminals Original Brand New

Overview

The Siemens SIRIUS 3RT2037-3KB40 is a high-performance 3-pole power contactor from the robust SIRIUS modular system, specifically engineered for switching motors and auxiliary circuits up to 30 kW / 400 V (AC-3e/AC-3). Its compact Size S2 frame offers a space-saving solution with a high switching capacity.

Designed for modern automation systems, it features a 24 V DC control voltage with a wide operating range and an integrated varistor for essential coil protection against voltage spikes. The combination of screw terminals for the main circuit and maintenance-free spring-loaded terminals for the control and auxiliary circuits ensures fast, vibration-proof, and reliable wiring, making it perfectly suitable for PLC outputs.

Benefit

• Exceptional Reliability & Longevity: Part of the trusted Siemens SIRIUS family, ensuring high contact reliability and a mechanical life of up to 10 million cycles for long-term, trouble-free operation.
• Space-Saving Design: The compact S2 frame size allows for higher packing density and efficient use of control cabinet space.
• Optimal PLC Integration: The 24V DC control coil is specifically designed to work seamlessly with modern PLC systems, and the integrated varistor protects sensitive PLC outputs from coil-induced voltage peaks.
• Dual Terminal Technology: Features screw terminals for robust power wiring and innovative spring-loaded terminals for control wiring, providing a vibration-proof and maintenance-free connection for maximum system uptime.
• Worldwide Usability: Approved for global use and is IE3/IE4-ready, supporting energy-efficient motor switching.

Function

The 3RT2037-3KB40 serves as the primary switching element in motor control applications. It is used to safely switch three-phase motors and other electrical loads.

1. Motor Switching: Controls the flow of up to 65 A to a motor, providing reliable Direct-On-Line (DOL) starting and stopping for motors up to 30 kW.
2. Remote Control: The 24 V DC coil enables remote control of the main power circuit via low-voltage control signals from a PLC, push-button, or other control devices.
3. Status Feedback: The integrated 1 NO + 1 NC auxiliary contacts provide essential feedback signals to the control system (PLC) on the current switching status (open/closed) of the main contacts.
4. Coil Protection: The built-in varistor suppresses switching surges (voltage spikes) on the coil, protecting the coil itself and other components in the control circuit, particularly delicate PLC outputs.

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