Siemens 3RT2025-2BF40 SIRIUS Power Contactor, 17A, 7.5kW, 110V DC Coil, S0, Spring-Loaded Original Brand New

Overview

The Siemens 3RT2025-2BF40 is a high-performance, 3-pole SIRIUS 3RT2 power contactor designed for reliable switching of motors and other industrial loads up to 7.5 kW (at 400 V). This specific model features a rated operating current of 17 A (AC-3e/AC-3) and is equipped with a 110 V DC coil for actuation. Part of the compact Size S0 range, it includes integrated 1 NO + 1 NC auxiliary contacts and utilizes fast, vibration-proof spring-loaded terminals for both the main and auxiliary circuits, making wiring efficient and maintenance-free.

Benefits & Features

1. Reliable Performance (AC-3e/AC-3): Ideal for standard motor switching applications, compliant with both the old AC-3 and the new IE3/IE4-ready AC-3e efficiency standards.
2. Fast & Secure Wiring: The innovative spring-loaded terminal technology ensures a quick, simple, and reliable connection that is resistant to vibration, reducing installation time and long-term maintenance needs.
3. Compact, Modular Design (Size S0): Part of the SIRIUS modular system, the S0 size provides a space-saving solution in control cabinets without compromising on performance.
4. Integrated Auxiliary Contacts: Includes a built-in 1 NO + 1 NC auxiliary contact block, simplifying circuitry and reducing the need for external add-ons.
5. Global Use: Climate-resistant and globally approved (e.g., IEC, UL/CSA), making it suitable for international projects and diverse industrial environments.
6. DC Coil Operation: The 110 V DC control voltage is common in many industrial DC control systems, offering robust and consistent switching.

Function

The Siemens 3RT2025-2BF40 power contactor is an electromechanical switching device used in control circuits to remotely switch a main power circuit, typically for starting and stopping electric motors. When the 110 V DC coil is energized, it closes the three main power contacts, allowing current to flow to the motor or load. Simultaneously, the integrated auxiliary contacts switch their state, providing feedback or enabling interlock functions within the control system. The use of a spring-loaded terminal ensures reliable current transfer and signal integrity.

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