Siemens 3RT2025-1FB40 SIRIUS Power Contactor, 17A, 7.5kW, 24V DC, S0 Size, 1 NO + 1 NC Aux Contacts Original Brand New

Overview

The Siemens 3RT2025-1FB40 is a high-performance SIRIUS 3RT2 series power contactor designed for reliable switching of three-phase motors and other loads up to 17A. Its compact S0 size and robust construction make it an excellent choice for a wide range of industrial control applications. Featuring a 24V DC control voltage with a plugged-in diode combination, this contactor offers energy efficiency and enhanced coil protection. The integrated 1 NO + 1 NC auxiliary contacts provide convenient feedback and control logic integration.

Key Features & Specification

• Product Number: 3RT2025-1FB40
• Product Type: Power Contactor
• Series: SIRIUS 3RT2
• Application: AC-3e/AC-3 (Motor Switching)
• Rated Operational Current: 17 A (at 400V)
• Rated Power: 7.5 kW (at 400V)
• Number of Poles: 3-pole
• Control Supply Voltage: 24 V DC
• Auxiliary Contacts: 1 Normally Open (NO) + 1 Normally Closed (NC)
• Coil Protection: Plugged-in diode combination
• Connection Type: Screw terminals
• Size: S0 (Standard)
• Installation: Snap-on and screw mounting on 35 mm standard rail

Benefit

• Reliable Performance: Engineered by Siemens, a global leader in industrial automation, for long-lasting and consistent operation in demanding environments.
• Space-Saving Design: The compact S0 size allows for high-density installation in control cabinets, maximizing panel space.
• Efficient Control: The 24V DC coil with diode combination minimizes energy consumption and provides surge suppression, protecting the control circuit.
• Versatile Application: Suitable for a wide variety of motor control, heating, and lighting applications.
• Easy Integration: The built-in 1 NO and 1 NC auxiliary contacts simplify wiring for interlocking, signaling, and control logic.
• Simple Installation: Standard screw terminals and snap-on mounting facilitate quick and secure installation.

Function

The Siemens 3RT2025-1FB40 power contactor serves as an electromechanical switch. When the 24V DC control voltage is applied to its coil, it generates a magnetic field that closes the main contacts. This allows the high-power circuit (up to 17A, 7.5kW) to be energized, typically to start and stop a motor. The 1 NO (Normally Open) auxiliary contact closes simultaneously, while the 1 NC (Normally Closed) auxiliary contact opens, providing a change of state that can be used for feedback to a PLC, interlocks, or visual indicators. The plugged-in diode combination protects the control circuit from voltage spikes when the coil is de-energized.

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