Siemens 3RT2617-1AB05 Capacitor Contactor, AC-6b 12.5 kVAr, 24V AC, Size S00 Original Brand New

Overview

The Siemens 3RT2617-1AB05 is a high-performance capacitor contactor designed for switching capacitive loads in reactive current compensation systems and converter applications. As a specialized version of the SIRIUS 3RT2 series, this contactor is engineered to handle AC-6b switching duties, effectively limiting peak charging currents to protect power supply networks. It features integrated precharging resistors, which are engaged via leading auxiliary contacts, ensuring a soft switching process for capacitors up to 12.5 kVAr at 400V. This model is a 3-pole device with a 24V AC control voltage, 50/60 Hz frequency, and includes two normally-closed (NC) auxiliary contacts with screw terminals. Its compact size S00 form factor makes it ideal for space-constrained installations.

Technical Specifications

• Product Number: 3RT2617-1AB05
• Product Type: Capacitor Contactor
• Application: Switching capacitive loads (AC-6b)
• Capacitance Rating: 12.5 kVAr at 400 V
• Poles: 3-pole
• Control Supply Voltage: 24 V AC, 50/60 Hz
• Auxiliary Contacts: 2 NC (Normally Closed)
• Terminal Type: Screw Terminal
• Size: S00
• Standards: IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1, IEC 60831-1, IEC 61921

Benefits & Features

• Enhanced Network Protection: The built-in precharging resistors effectively limit the high inrush currents typical of capacitive loads, minimizing voltage sags and harmonic distortion on the power supply network.
• Optimized Performance: Specifically designed for AC-6b switching duty, the 3RT2617-1AB05 ensures reliable and long-lasting operation in reactive power compensation applications.
• Compact Design (Size S00): The small footprint allows for efficient use of space within control panels and electrical cabinets, simplifying installation and reducing overall panel size.
• Integrated Auxiliary Contacts: Equipped with two NC auxiliary contacts, this contactor provides flexibility for control and signaling circuits.
• Robust Screw Terminals: The secure screw terminals ensure a reliable and durable connection, simplifying wiring and maintenance.

Function

The 3RT2617-1AB05 capacitor contactor operates by using a sophisticated switching sequence. When the contactor is energized, leading auxiliary contacts close first, engaging precharging resistors that limit the initial inrush current to the capacitive load. After a very short delay, the main power contacts close, bypassing the resistors and providing full power to the capacitor bank. This two-stage process prevents damaging current spikes, extending the life of the capacitors and protecting sensitive equipment on the same circuit.

Protection & Safety

For optimal safety and device longevity, all connections to the 3RT2617-1AB05 must be protected against short circuits and overloads. This includes the main power connections, auxiliary contacts, and the control supply voltage. The use of suitable circuit breakers or fuses is essential. For information on device combinations and proper protection measures, refer to the Digital Configuration Manual for Siemens load feeders. Surge suppressors, such as RC elements or varistors, are available as accessories to protect the control circuit from overvoltage.

Expansion Possibilities

The Siemens 3RT26 series offers modularity for enhanced functionality. While the 3RT2617-1AB05 comes with integrated auxiliary contacts, additional lateral auxiliary switches can be mounted to expand control and signaling options, depending on the specific application requirements.

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