Siemens 3RT7025-1AH05 Contactor 18A, 7.5kW, 48V AC Coil, S0 Size, Screw Terminal Original Brand New

Overview: Siemens 3RT7025-1AH05 Contactor

The Siemens 3RT7025-1AH05 is a high-performance contactor from the trusted Siemens Sirius 3RT series, designed for reliable switching of electric motors and other loads. This specific model is an AC-3 contactor with a robust 18A rating for operation at 400V, handling motor power up to 7.5kW.

Engineered for efficiency and durability, this contactor features a compact Size S0 design, making it a space-saving solution for control panels and industrial enclosures. Its integrated 1NO (Normally Open) and 1NC (Normally Closed) auxiliary contacts provide essential feedback and control options, ensuring seamless integration into complex control circuits.

The Siemens 3RT7025-1AH05 is powered by an AC 48V, 50Hz control coil, making it suitable for a wide range of standard industrial power systems. The secure screw terminals ensure a reliable and straightforward electrical connection, simplifying installation and maintenance.

Key Features & Benefit

• High Performance: Rated for AC-3 duty at 18A and 7.5kW (at 400V), this contactor is built to handle demanding motor switching applications.
• Integrated Auxiliary Contacts: The 1NO + 1NC configuration provides versatility for interlocking, signaling, and control functions.
• Compact Design: The Size S0 form factor allows for high-density installations, optimizing panel space.
• Reliable Operation: Part of the Siemens Sirius series, known for its long service life, mechanical and electrical endurance, and operational reliability.
• Easy Installation: Features robust screw terminals for secure and simple wiring, reducing installation time and effort.
• Wide Application Range: Ideal for switching standard squirrel-cage motors, heaters, lighting systems, and other resistive loads.

Function

The Siemens 3RT7025-1AH05 contactor is an electromechanical switch used for remotely controlling a high-power electrical circuit with a low-power control signal. When the 48V AC control coil is energized, it closes the main power contacts, allowing current to flow to the connected load (e.g., an electric motor). When the coil is de-energized, an internal spring mechanism opens the contacts, interrupting the power supply. The auxiliary contacts (1NO + 1NC) change state in tandem with the main contacts, providing a signal that indicates the contactor’s status to the control system.

Technical Specification

• Product Number: 3RT7025-1AH05
• Type: Contactor, AC-3
• Main Current Rating: 18A (at 400V)
• Motor Power Rating: 7.5kW (at 400V)
• Control Coil Voltage: 48V AC, 50Hz
• Size: S0
• Auxiliary Contacts: 1NO + 1NC
• Terminal Type: Screw Terminal
• Manufacturer: Siemens
• Series: Sirius 3RT
• Installation: DIN rail mounting or screw fixing

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