Siemens 3RT2628-1AP05 SIRIUS Capacitor Contactor, AC-6b, 33 kVAr, 400V, 230V AC Coil, Size S0 Original Brand New

Overview

The Siemens SIRIUS 3RT2628-1AP05 is a high-performance capacitor contactor specifically engineered for switching capacitive loads in power factor correction systems. Part of the SIRIUS 3RT26 series, this robust 3-pole contactor is designed for AC-6b operation, handling loads up to 33 kVAr at 400 V. Its primary function is to limit the high inrush current associated with switching capacitors, thereby protecting the power network and extending the lifespan of the equipment.

This model features a 230 V AC, 50 Hz control coil and comes equipped with a combination of auxiliary contacts (1 NO + 2 NC) for signaling and control purposes. The screw terminals ensure a secure and reliable connection, while the compact S0 size makes it suitable for integration into various control panels and reactive power compensation systems. The Siemens 3RT2628-1AP05 adheres to leading international standards, including IEC 60947 and IEC 60831, guaranteeing quality, safety, and reliability.

Key Benefit

• Minimizes Inrush Current: Integrated precharging resistors limit the peak charging current of capacitive loads, reducing stress on the power supply network and connected components.
• Enhanced System Stability: By controlling inrush currents, the contactor helps prevent voltage sags and disturbances, contributing to a more stable electrical system.
• Extended Equipment Life: Protects capacitors, fuses, and circuit breakers from the damaging effects of high-inrush currents, leading to a longer operational life for the entire system.
• Versatile Application: Ideal for switching choked or unchoked capacitors in reactive current compensation systems and for use with converters.
• Reliable Control and Signaling: The integrated auxiliary contacts (1 NO + 2 NC) provide flexibility for interlocking, status feedback, and other control circuit functions.
• Compliance with Global Standards: Certified according to IEC 60947 and other relevant standards, ensuring high performance, safety, and compatibility.

Technical Functions and Features

• AC-6b Operation: Specifically rated for switching capacitive loads, ensuring safe and efficient operation in reactive power compensation applications.
• Precharging Resistors: Leading auxiliary contacts engage precharging resistors before the main contacts close. This patented technology effectively limits the inrush current.
• Control Coil: The 230 V AC, 50 Hz coil provides reliable and consistent switching performance.
• Auxiliary Contacts: Includes 1 Normally Open (NO) and 2 Normally Closed (NC) contacts, enabling a wide range of control and monitoring possibilities.
• Screw Terminals: Provides a robust and secure method for wiring, ensuring a long-lasting and reliable connection.
• Size S0: Compact design allows for space-saving installation in control cabinets.

Protection and Safety

The Siemens 3RT2628-1AP05 requires proper protection for all connections to ensure safe and reliable operation. This includes:

• Main Connections: Short-circuit and overload protection must be implemented according to the technical product data sheet and relevant configuration manuals.
• Auxiliary Connections: Protection of auxiliary contacts should also follow guidelines provided in the technical data sheet.
• Control Supply Voltage: The control circuit should be protected against short circuits and overloads using suitable measures, such as fuses or circuit breakers, considering the contactor’s inrush current and holding power.
• Overvoltage Protection: The control coil can be protected against opening surges by retrofitting optional surge suppressors (RC elements, varistors, or diodes), which must be ordered separately.

Note on Damping: The use of surge suppressors may slightly increase the contactor’s break times and the switching delay times of the auxiliary contacts.

Standard

• IEC 60947‑1
• IEC 60947‑4‑1
• IEC 60947‑5‑1
• IEC 60831‑1
• IEC 61921

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