Siemens 3RT2636-1AV03 SIRIUS Capacitor Contactor, S2 Size, 50kVAr (400V), Screw Terminal Original Brand New

Overview

The Siemens 3RT2636-1AV03 is a specialized SIRIUS capacitor contactor designed for the reliable switching of capacitive loads in power factor correction systems and other applications. Engineered to meet the demanding requirements of AC-6b duty, this robust S2 size contactor is rated for 50 kVAr at 400V. It features integrated precharging resistors and leading auxiliary contacts to effectively limit the inrush current that occurs when switching capacitors. This design minimizes stress on the electrical network and prolongs the lifespan of the system components. With its 3-pole configuration, 400V AC 50Hz coil, and a built-in 1 NO + 1 NC auxiliary contact block, the 3RT2636-1AV03 offers a complete and reliable solution for managing capacitive loads.

Key Features & Benefit

• Optimized for Capacitive Loads (AC-6b): Specifically designed to switch capacitors, the 3RT2636-1AV03 minimizes inrush current, preventing voltage sags and protecting your electrical equipment and power grid.
• Integrated Precharging Resistors: The contactor includes leading auxiliary contacts that switch in precharging resistors before the main contacts close. This limits the peak charging current, ensuring smooth and safe operation.
• High Performance and Reliability: Rated for 50 kVAr at 400V, this contactor is built to withstand frequent switching cycles and is suitable for both choked and unchoked capacitor banks.
• Easy and Secure Installation: The screw terminals provide a secure and reliable connection for both the main circuit and control wiring, simplifying installation and maintenance.
• Convenient Auxiliary Contacts: The integrated 1 NO + 1 NC auxiliary contacts offer a simple way to integrate the contactor into control and monitoring circuits without the need for additional accessories.
• Durable and Compact Design (Size S2): Part of the SIRIUS family, this contactor combines a space-saving design with the durability and quality expected from Siemens, ensuring long-term performance.

Function

The 3RT2636-1AV03 capacitor contactor operates by controlling the flow of current to a capacitive load. Unlike standard contactors, it is equipped with a unique mechanism to handle the high inrush currents typical of capacitor switching. When the contactor coil is energized, the leading auxiliary contacts close first, engaging precharging resistors that limit the initial charging current. After a brief delay, the main contacts close, bypassing the resistors and establishing a direct connection. This two-stage switching process effectively dampens the current surge, protecting both the contactor and the power system.

Standard

The Siemens 3RT2636-1AV03 capacitor contactor complies with the following international standards:

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

Protection and Safety

All connections, including main, auxiliary, and control circuits, must be protected against short circuits, overloads, and overvoltage. Refer to the technical product data sheet, digital configuration manuals for load feeders, and control panel tips for specific recommendations on selecting and sizing suitable protection devices such as fuses, circuit breakers, and power supplies. For overvoltage protection of the control supply voltage, optional surge suppressors (RC elements, varistors, etc.) can be retrofitted, which are available as accessories.

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