Siemens SIRIUS 3RT2326-1BF40 4-Pole AC-1 Contactor 40A, 110V DC Coil, S0 Size, Screw Terminal Original Brand New

Siemens SIRIUS 3RT2326-1BF40 4-Pole AC-1 Contactor for Reliable Industrial Switching

The Siemens 3RT2326-1BF40 is a high-performance 4-pole AC-1 contactor from the renowned SIRIUS 3RT23 series, engineered for efficiently switching weak or non-inductive loads up to 40 Amperes at 400 V / 40 °C. This robust contactor features a 110 V DC coil for precise control and includes a versatile configuration of 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts, providing essential feedback and interlocking capabilities. Designed for quick and secure wiring, it utilizes reliable screw terminals and comes in a compact S0 size, making it suitable for a wide range of industrial control panel application.

Key Features and Benefit

• High Current Rating: Handles AC-1 loads up to 40A, ideal for resistive or slightly inductive loads.
• 4-Pole Configuration: Provides multi-phase switching for various applications.
• Efficient DC Coil: Operates with a 110 V DC control voltage, ensuring stable and responsive switching.
• Integrated Auxiliary Contacts: Features 1 NO + 1 NC auxiliary contacts for enhanced control circuit functionality, signaling, and interlocking.
• Secure Screw Terminals: Offers reliable and straightforward wiring for both main and auxiliary circuits.
• Compact S0 Size: Optimized for space-saving installation in control cabinets.
• Robust Construction: Built to Siemens’ high-quality standards for long-term durability and performance in demanding industrial environments.
• Standards Compliant: Meets stringent international standards including IEC 60947-1 (General rules), IEC 60947-4-1 (Contactors and motor-starters), and IEC 60947-5-1 (Control circuit devices and switching elements), ensuring safety and interoperability.

Overview

The Siemens 3RT2326-1BF40 contactor is part of the SIRIUS 3RT23 family, specifically designed for four-pole switching of weak or non-inductive loads (AC-1). This makes it perfect for applications like disconnecting loads or power generation plants from the grid, and transfer switching. Special versions of 3RT23 contactors are also available for switching motor-driven loads (AC-3).

Protection and Safety:

All connections of the 3RT2326-1BF40 must be protected against overload and short circuits. For main connections, consult the technical product data sheet for free-standing contactor protection. For device combinations with overload relays or circuit breakers as motor feeders, refer to the Digital and Configuration Manuals for load feeders. Auxiliary connections also require appropriate short-circuit and overload protection, detailed in the technical product data sheet.

Protection against overvoltage at the control supply voltage connection is crucial. 3RT23 contactors can be retrofitted with surge suppressors such as RC elements, varistors, or diodes (available separately as accessories) to dampen opening surges in the coil.

Connection Methods:

The 3RT2326-1BF40 features screw terminals for both its main and auxiliary/control circuits, ensuring secure and reliable electrical connections.

Electromagnetic Compatibility (EMC):

These contactors fulfill the requirements for environment category A, ensuring robust operation in industrial settings. When used with frequency converters, it is essential to observe the configuration notes in the Equipment Manual for optimal performance.

Contact Reliability:

For switching voltages $\le$ 110 V and currents $\le$ 100 mA, the auxiliary contacts of 3RT contactors are designed to provide a high level of contact reliability, making them particularly suitable for solid-state circuits with currents $\ge$ 1 mA at voltages of 17 V and higher.

Motor Protection:

For comprehensive motor protection, 3RU2 thermal overload relays or 3RB3 electronic overload relays can be directly mounted onto 3RT23 contactors like the 3RT2326-1BF40.

Operating Mechanism:

The 3RT2326-1BF40 is a version with a conventional DC operating mechanism (110 V DC). Its control takes place via terminals A1 – A2 with specific operating ranges, detailed further in the technical product data sheet.

Auxiliary Contact Expansion:

While the 3RT2326-1BF40 basic unit already contains two integrated auxiliary contacts (1 NO + 1 NC), all 3RT23 basic units can be expanded with additional auxiliary switches. Please refer to the documentation for permissible configurations.

Accessories and Spare Parts:

A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors, including surge suppressors, for enhanced functionality and maintenance.

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