Overview
The Siemens 3RT2326-1AK60 is a high-performance SIRIUS power contactor designed for reliable switching of resistive and slightly inductive loads (AC-1 applications). This robust 4-pole contactor, part of the Siemens 3RT23 series, is rated for 40 A at 400 V / 40 °C, making it an excellent choice for a wide range of industrial control applications. It features a versatile 110 V AC (50 Hz) / 120 V AC (60 Hz) coil voltage, integrated 1 NO + 1 NC auxiliary contacts for enhanced control, and secure screw terminals for easy and reliable wiring. Its compact S0 size ensures efficient use of panel space.
Key Features & Benefit
- High Performance AC-1 Switching: Specifically designed for four-pole switching of weak or non-inductive loads, ensuring efficient and safe operation in applications like heating, lighting, and general power distribution.
- Reliable Power Handling: Rated for 40 Amperes at 400 Volts (at 40 °C), providing robust performance for demanding AC-1 circuits.
- Versatile Coil Voltage: Operates on 110 V AC (50 Hz) or 120 V AC (60 Hz) control supply voltage, offering flexibility for various electrical systems.
- Integrated Auxiliary Contacts: Comes with 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts, simplifying control circuit design and providing immediate feedback on contactor status.
- Secure Screw Terminals: Ensures strong, reliable electrical connections, facilitating straightforward installation and maintenance.
- Compact S0 Size: Optimized for space-saving installation in control cabinets and panels.
- Enhanced Contact Reliability: Auxiliary contacts are designed for high contact reliability, particularly suitable for low voltages (≤ 110 V) and low currents (≤ 100 mA), ideal for solid-state circuits.
- Standards Compliant: Manufactured and tested to stringent international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), ensuring safety and quality.
- Robust Protection Considerations: Designed with considerations for short-circuit, overload, and overvoltage protection of main, auxiliary, and control connections, promoting system integrity and longevity.
- Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A, ensuring reliable operation in industrial settings.
Function
- Load Switching: Efficiently switches four-pole weak or non-inductive loads.
- Grid Disconnection: Capable of disconnecting loads or power generation plants from the grid.
- Transfer Switching: Suitable for transfer switching applications.
- Control Circuit Integration: Provides auxiliary contacts for interlocking, signaling, and control logic within automation systems.
Application
The Siemens 3RT2326-1AK60 contactor is ideal for a variety of applications requiring reliable switching of resistive loads, including:
- Heating systems
- Lighting circuits
- Capacitor banks
- Non-inductive furnace control
- General power distribution in industrial and commercial settings
- Disconnecting loads or power generation plants from the grid
- Transfer switching applications
Protection and Compatibility:
- Short-circuit and Overload Protection: It is crucial to protect all connections against overload and short circuits using suitable measures. Refer to the technical product data sheet and configuration manuals for detailed guidance on protecting main, auxiliary, and control supply voltage connections.
- Overvoltage Protection: The 3RT23 contactors without pre-installed coil damping can be retrofitted with surge suppressors (RC elements, varistors, diodes, or diode assemblies) which are sold separately.
- Motor Protection: For protection against overload when used with motors, 3RU2 thermal overload relays or 3RB3 electronic overload relays can be mounted on the 3RT23 contactors (though this specific model is primarily for AC-1 loads, not AC-3 motor loads).
- Electromagnetic Compatibility: Designed to meet environment category A requirements. When used with frequency converters, specific configuration notes in the Equipment Manual must be observed.
Accessories and Spare Parts:
A range of accessories and spare parts are available for the SIRIUS 3RT2 contactor series, including surge suppressors and additional auxiliary switches, to enhance functionality and ensure long-term operation. Please refer to the Siemens SIRIUS 3RT2 accessories catalog for compatible items.
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