Siemens 3RT2025-2DB40 Power Contactor SIRIUS 3RT20, 17A, 24V DC, S0 Original Brand New

Overview

The Siemens 3RT2025-2DB40 Power Contactor from the SIRIUS 3RT20 series is a robust and highly reliable industrial switching device designed for motor control and other demanding applications. This 3-pole contactor is rated for $17\text{A}$ and $7.5\text{kW}$ at $400\text{V}$ (AC-3e/AC-3), making it ideal for standard industrial loads.

Its core features include a 24 V DC operating coil with a built-in plugged-in varistor for coil protection against switching surges, ensuring a long operational life. The compact Size S0 frame allows for space-efficient installation in control cabinets, and the spring-loaded terminals offer fast, vibration-proof, and maintenance-free wiring.

Benefit

• Exceptional Reliability: Part of the proven Siemens SIRIUS Control series, known for high switching performance and long mechanical life.
• Coil Protection: The integrated varistor protects the coil and surrounding control electronics from harmful voltage spikes, a key benefit in DC-controlled systems.
• Fast & Secure Wiring: Spring-loaded terminals reduce wiring time significantly compared to screw terminals and provide a reliable, maintenance-free connection, especially in environments subject to vibration.
• Space-Saving Design: The compact Size S0 frame allows for a high packing density, optimizing control cabinet real estate.
• Versatile Application: Suitable for switching 3-phase AC motors, heating circuits, and general resistive/inductive loads.

Function

The Siemens 3RT2025-2DB40 primarily functions as an electromechanical switch used for the remote and automatic control of power circuits.

1. Motor Switching: Safely switches 3-phase electric motors ON and OFF, handling the high inrush currents typical of motor loads (AC-3/AC-3e duty).
2. Load Control: Controls other high-current loads like transformers, heating elements, and lighting systems (AC-1 duty).
3. Circuit Indication: The integrated $1\text{NO}+1\text{NC}$ auxiliary contacts provide real-time feedback on the contactor's switching state to the control system (e.g., PLC).

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