Siemens 3RT2628-1BF45 SIRIUS Capacitor Contactor 33 kVAr, 400V, 110V DC Coil, Size S0 Original Brand New

Overview

The Siemens 3RT2628-1BF45 is a high-performance SIRIUS capacitor contactor specifically engineered for the reliable switching of capacitive loads (AC-6b). Designed for use in reactive current compensation systems, this contactor effectively manages the high inrush currents associated with switching capacitors. Its advanced design incorporates leading auxiliary contacts that engage precharging resistors, minimizing current peaks and ensuring stable operation. This model is suitable for switching both choked and unchoked capacitors and can also be used in converter applications.

Key Features & Benefit

• Optimized for Capacitive Loads: The built-in precharging resistors, activated by leading auxiliary contacts, significantly limit peak charging currents. This protects the power supply network and extends the lifespan of the equipment.
• High Performance: Capable of handling capacitive loads up to 33 kVAr at 400V, making it a robust solution for a wide range of industrial applications.
• Reliable Operation: Equipped with a 110 V DC coil and 1 NO + 2 NC auxiliary contacts, providing reliable control and feedback within your system.
• Compact Design: The Size S0 form factor allows for efficient use of space in control panels without compromising performance.
• Easy Installation: Features screw terminals for secure and straightforward wiring.
• Compliance with Global Standards: Manufactured to meet stringent international standards including IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, and IEC 61921, ensuring quality and safety.

Functionality

The Siemens 3RT2628-1BF45 contactor’s primary function is to switch capacitive loads in reactive power compensation systems. It utilizes a unique two-stage switching process. When the contactor is energized, the leading auxiliary contacts close first, bringing precharging resistors into the circuit. These resistors absorb the initial high inrush current. Following this, the main power contacts close, bypassing the resistors and allowing full current flow to the capacitor. This mechanism effectively reduces stress on the electrical system and connected components.

Technical Specification

• Product Type: Capacitor Contactor
• Product Number: 3RT2628-1BF45
• Load Type: AC-6b
• Capacitive Load Rating: 33 kVAr @ 400 V
• Number of Poles: 3-pole
• Coil Voltage: 110 V DC
• Auxiliary Contacts: 1 NO (Normally Open) + 2 NC (Normally Closed)
• Connection Type: Screw Terminal
• Size: S0
• Standards Compliance: IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, IEC 61921

Application Notes

• Overload and Short-Circuit Protection: It is essential to implement suitable short-circuit and overload protection for all connections (main, auxiliary, and control). Refer to the technical product data sheet and configuration manuals for detailed guidance.
• Overvoltage Protection: The contactor’s control circuit can be protected against overvoltage by retrofitting with a surge suppressor such as an RC element, varistor, or diode assembly (accessories sold separately).
• Auxiliary Contact Configuration: This 3RT2628 model comes with two free auxiliary contacts (1 NO + 1 NC) in addition to the four-pole front-mounted switch. The contactor can be expanded with additional lateral auxiliary switches if needed, following the permissible configuration guidelines.

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