Siemens 3RT2628-1AK65 Capacitor Contactor 33 kVAr, 400V, Size S0, 110V AC Coil Original Brand New

Overview

The Siemens 3RT2628-1AK65 is a high-performance capacitor contactor designed for the reliable switching of capacitive loads (AC-6b). With a rating of 33 kVAr at 400 V, this 3-pole contactor is engineered to minimize the negative impact of high inrush currents on power supply networks, making it ideal for reactive current compensation systems and converter applications. Featuring a 110 V AC, 50 Hz / 120 V, 60 Hz coil, 1 normally open (NO) and 2 normally closed (NC) auxiliary contacts, and secure screw terminals, the 3RT2628-1AK65 provides a robust and efficient solution for your electrical systems. Its compact Size S0 design ensures easy integration into various control panels.

Key Benefit

• Minimizes Inrush Currents: Integrated precharging resistors, activated by leading auxiliary contacts, effectively limit the peak charging current of capacitive loads. This protects the power network and extends the life of connected equipment.
• Enhanced Reliability: Specifically engineered for AC-6b applications, the 3RT2628-1AK65 ensures stable and consistent performance when switching capacitors, which is crucial for power factor correction and reactive power compensation.
• Versatile Application: Suitable for switching both choked and unchoked capacitors in reactive current compensation systems, and can also be used for switching converters.
• Flexible Integration: The Size S0 form factor and screw terminals allow for straightforward installation and wiring within existing electrical enclosures.
• Comprehensive Auxiliary Contacts: Equipped with 1 NO and 2 NC auxiliary contacts, this contactor offers flexibility for control and signaling circuits.

Function & Characteristic

The Siemens 3RT2628-1AK65 capacitor contactor is a specialized version of the 3RT2 series, designed to handle the unique challenges of switching capacitive loads. Its core functionality is centered around precharging resistors that are briefly connected to the circuit before the main contacts close.

• Precharging Resistors: These resistors are switched on via leading auxiliary contacts, which close milliseconds before the main contacts. This action dampens the initial current surge that occurs when a capacitor is connected, preventing voltage sags and minimizing stress on the network and the capacitor bank itself.
• AC-6b Rated: This rating signifies the contactor’s suitability for switching capacitors, ensuring it can handle the high inrush currents without premature wear or failure.
• Auxiliary Contacts: The provided 1 NO + 2 NC auxiliary contacts (in addition to the integrated resistor contacts) can be used for feedback, interlocking, or other control functions.
• Coil Voltage: The 110 V AC (50 Hz) / 120 V AC (60 Hz) coil ensures compatibility with common control voltages in industrial environments.

Technical Specification

• Product Number: 3RT2628-1AK65
• Product Type: Capacitor Contactor
• Standard Compliance: IEC 60947‑1, IEC 60947‑4‑1, IEC 60947‑5‑1, IEC 60831‑1, IEC 61921
• AC-6b Rating: 33 kVAr at 400 V
• Poles: 3-pole
• Coil Voltage: 110 V AC (50 Hz) / 120 V AC (60 Hz)
• Auxiliary Contacts: 1 NO (Normally Open) + 2 NC (Normally Closed)
• Terminal Type: Screw Terminal
• Size: S0

Protection & Safety

To ensure safe and reliable operation, proper protection measures must be implemented for the Siemens 3RT2628-1AK65.

• Short-circuit and Overload Protection: It is essential to protect all main and auxiliary connections against short circuits and overloads using appropriate circuit breakers or fuses as per the technical product data sheet and relevant standards.
• Overvoltage Protection: The contactor’s coil circuit can be protected against opening surges by retrofitting it with optional surge suppressors (RC elements, varistors, etc.). Please note that these may slightly increase the contactor’s break times.

Expansion Possibilities

The Siemens 3RT2628-1AK65 can be further expanded with additional auxiliary switches to meet complex control requirements. Consult the product documentation for permissible configurations and available accessories.

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