Siemens SIRIUS 3RT2326-2AK60 Contactor AC-1, 40A, 4-Pole, 110V AC / 120V 60Hz, Spring-Loaded Terminal, Size S0 Original Brand New

Siemens SIRIUS 3RT2326-2AK60 AC-1 Contactor

The Siemens SIRIUS 3RT2326-2AK60 is a high-performance 4-pole contactor designed for reliable switching of weak or non-inductive loads in accordance with AC-1 utilization category. Rated for 40 Amperes at 400 V / 40 °C, this compact Size S0 contactor is an essential component for various industrial applications, including power distribution, disconnecting loads, and transfer switching.

Equipped with a versatile control coil that operates on 110 V AC at 50 Hz and 120 V AC at 60 Hz, the 3RT2326-2AK60 offers flexibility for diverse power systems. Its integrated 1 NO (Normally Open) and 1 NC (Normally Closed) auxiliary contacts provide valuable feedback and interlocking capabilities for complex control circuits. The innovative spring-loaded terminals ensure fast, secure, and vibration-resistant wiring, reducing installation time and maintenance efforts.

Part of the robust Siemens SIRIUS family, the 3RT2326-2AK60 adheres to stringent international standards such as IEC 60947, ensuring safety, reliability, and electromagnetic compatibility in demanding industrial environments.

Benefit

• Reliable Switching: Optimized for AC-1 loads, providing dependable control for non-inductive applications.
• Space-Saving Design: Compact Size S0 footprint allows for efficient use of panel space.
• Flexible Control: Dual-frequency AC coil (110V 50Hz / 120V 60Hz) accommodates various power supplies.
• Enhanced Connectivity: Spring-loaded terminals offer quick, secure, and maintenance-free wiring.
• Integrated Auxiliary Contacts: 1 NO + 1 NC contacts provide immediate feedback and control possibilities.
• Robust & Compliant: Built to IEC standards for high performance and electromagnetic compatibility.
• Easy Integration: Compatible with Siemens SIRIUS accessories like overload relays for comprehensive motor protection (though primarily for AC-1 loads, understanding system integration is key).

Function

• 4-Pole Switching: Controls four independent power circuits simultaneously.
• AC-1 Utilization: Specifically designed for switching non-inductive or slightly inductive loads, resistance furnaces, and heaters.
• Remote Control: Activates and deactivates loads from a control panel or automation system via the coil supply.
• Auxiliary Signaling: The integrated auxiliary contacts signal the contactor’s status (open/closed) to control systems or for interlocking purposes.
• System Integration: Can be combined with appropriate protection devices (e.g., fuses, circuit breakers) for short-circuit and overload protection of main and auxiliary circuits.
• Voltage Damping Compatibility: Can be retrofitted with surge suppressors for coil overvoltage protection.

Standards & Protection:

The Siemens 3RT2326-2AK60 contactor conforms to leading international standards for low-voltage switchgear and controlgear, including:

• IEC 60947-1 (General Rules)
• IEC 60947-4-1 (Contactors and Motor-starters)
• IEC 60947-5-1 (Control Circuit Devices and Switching Elements – Auxiliary Switches)

Protection of Connections: It is crucial to protect all connections against short circuits, overload, and overvoltage using suitable external measures.

• Main Connections: Refer to the technical product data sheet for specific protection guidelines for a free-standing contactor. For combinations with overload relays or circuit breakers as motor feeders, consult the Digital Configuration Manual or Configuration Manual for load feeders.
• Auxiliary Connections: Protection information available in the technical product data sheet.
• Control Supply Voltage Connections: Protection depends on relevant standards for control panel configuration. Selection of current-limiting power supplies or suitable protection devices (e.g., miniature circuit breakers) is recommended, considering inrush current peaks and holding power.

Overvoltage Protection (Control Supply): 3RT23 contactors can be retrofitted with external surge suppressors (RC elements, varistors, diodes) to dampen opening surges in the coil. Note that damping increases break and delay times.

Connection Methods:

• Main Circuit: Spring-loaded terminals with convenient plug-in design for the device connector.
• Auxiliary and Control Circuit: Screw terminals.

Electromagnetic Compatibility (EMC): The contactors meet the requirements for environment category A. When used with frequency converters, observe configuration notes in the Equipment Manual.

Contact Reliability of Auxiliary Contacts: The auxiliary contacts are designed for high contact reliability, especially suitable for switching voltages $\le$ 110 V and currents $\le$ 100 mA, including solid-state circuits with currents $\ge$ 1 mA at 17 V and higher.

Motor Protection Compatibility (for context, primarily for AC-1): While this contactor is for AC-1 loads, it’s part of a family that integrates with motor protection. For 3RT23 contactors, 3RU2 thermal overload relays or 3RB3 electronic overload relays can be mounted for overload protection.

Operating Mechanism: This 3RT23 contactor features a conventional AC operating mechanism, controlled via terminals A1-A2.

Maintenance & Expansion:

• Solenoid Coil Replacement: Possible for this model.
• Auxiliary Contact Expansion: The 3RT2326-2AK60 includes two integrated auxiliary contacts (1 NO + 1 NC). Additional auxiliary switches can be mounted, observing permissible configurations. Refer to “Auxiliary switches, instantaneous → Overview” for detailed information.

Application

The Siemens SIRIUS 3RT.3 contactors, including the 3RT2326-2AK60, are ideally suited for:

• Four-pole switching of weak or non-inductive loads (AC-1 category).
• Disconnecting various loads or power generation plants from the electrical grid.
• Transfer switching applications, ensuring seamless transitions between power sources or loads.

For more Siemens industrial control products and accessories, visit Turll.