Siemens 3RT2627-1AP65 Capacitor Contactor AC-6b, 25 kVAr, 400V, Size S0 Original Brand New

Overview

The Siemens 3RT2627-1AP65 is a high-performance capacitor contactor specifically engineered for switching capacitive loads in reactive current compensation systems. As part of the SIRIUS 3RT2 product family, this contactor is designed for demanding applications up to 100 kVar at 400V. It features a robust design with integrated precharging resistors, which are engaged via leading auxiliary contacts. This innovative design limits the peak charging current of capacitors, minimizing stress on the power supply network and extending the lifespan of your equipment.

Key Features & Technical Specification

• Product Number: 3RT2627-1AP65
• Contactor Type: Capacitor Contactor
• Application: Switching capacitive loads (AC-6b)
• Capacitive Load Rating: 25 kVAr at 400 V
• Poles: 3-pole
• Control Supply Voltage: 220 V AC, 50 Hz / 240 V AC, 60 Hz
• Auxiliary Contacts: 1 Normally Open (NO) + 2 Normally Closed (NC)
• Terminal Type: Screw terminal
• Size: S0
• Standards: IEC 60947‑1, IEC 60947‑4‑1, IEC 60947‑5‑1, IEC 60831‑1, IEC 61921
• Integrated Protection: Precharging resistors to limit peak charging current

Benefit

• Enhanced System Longevity: The precharging resistors effectively limit inrush currents, reducing electrical stress on both the capacitor and the power supply system. This extends the service life of all connected components.
• Reliable Performance: Built to IEC standards, this Siemens contactor provides reliable and safe operation in demanding industrial environments.
• Versatile Application: Ideal for switching choked or unchoked capacitors in reactive power compensation systems and for converter applications.
• Ease of Installation: The screw terminals and compact size S0 make for straightforward installation and integration into existing control panels.
• Flexible Configuration: The design allows for the addition of various accessories like surge suppressors, which can be ordered separately to customize protection and performance.

Function

The Siemens 3RT2627-1AP65 capacitor contactor operates by employing a set of precharging resistors that are briefly connected to the circuit before the main contacts close. When the control voltage is applied, the leading auxiliary contacts close first, bringing the resistors into the circuit. This initial connection charges the capacitor slowly, mitigating the high inrush current that would otherwise occur. After a short delay, the main contacts close, bypassing the resistors and allowing the full current to flow. The contactor’s 1 NO + 2 NC auxiliary contacts provide additional functionality for signaling and interlocking within a control circuit.

Short-Circuit & Overload Protection

For comprehensive safety, all connections must be protected against short circuits and overloads. The technical product data sheet provides detailed information on protecting a standalone contactor. For more complex setups, such as motor feeders, refer to the Digital and Configuration Manuals. Auxiliary and control supply connections should also be protected in accordance with relevant standards, considering the contactor’s load characteristics and potential use of miniature or circuit breakers.

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