Overview
The Siemens 3RT2346-1AN20 is a high-performance 4-pole contactor designed for robust switching of AC-1 (non-inductive or weakly inductive) loads in industrial and commercial applications. Rated for 140 A at 400 V and 40 °C, this Size S3 contactor features a 220 V AC (50/60 Hz) operating coil and comes equipped with essential 1 Normally Open (NO) + 1 Normally Closed (NC) auxiliary contacts, ensuring reliable feedback and control. Its secure screw terminals facilitate straightforward installation. Built to stringent IEC standards, the 3RT2346-1AN20 offers exceptional reliability and a long service life, making it an ideal choice for power distribution, load disconnection, and transfer switching applications.
Key Functions & Features
- 4-Pole Switching (AC-1): Specifically engineered for switching non-inductive or weakly inductive loads, such as resistance furnaces, heaters, or distribution circuits. Also suitable for disconnecting loads or power generation plants from the grid and transfer switching.
- High Current Rating: Handles up to 140 A at 400 V / 40 °C, providing ample capacity for demanding applications.
- 220 V AC Coil: Compatible with standard 220 V AC (50/60 Hz) control circuits for seamless integration.
- Integrated Auxiliary Contacts: Features 1 NO and 1 NC auxiliary contacts (integrated in the basic unit) for enhanced control, signaling, and interlocking functionalities.
- Screw Terminals: Ensures secure and reliable electrical connections, simplifying wiring and maintenance.
- Compact Size S3: Optimized dimensions for efficient space utilization within control panels and enclosures.
- Standards Compliance: Fully compliant with IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), guaranteeing safety and performance.
- Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A.
- Expandable Auxiliary Switches: Basic unit can be expanded with additional auxiliary switches to meet complex control requirements.
- Solenoid Coil Replacement: The solenoid coil can be replaced for extended product lifespan.
Benefit
- Enhanced Reliability: Built with Siemens' renowned quality and adherence to international standards, ensuring stable and long-term operation.
- Versatile Application: Ideal for a wide range of AC-1 applications, including power distribution, heating systems, lighting control, and grid disconnection.
- Simplified Installation: Screw terminals and a compact design streamline the installation process, reducing labor time and costs.
- Flexible Control: Integrated and expandable auxiliary contacts provide versatile options for interlocking, signaling, and automated control.
- Cost-Effective Maintenance: Replaceable solenoid coil contributes to a longer service life and lower overall cost of ownership.
- Robust Protection: Designed with considerations for short-circuit, overload, and overvoltage protection of connections (requires suitable external protection measures).
Protection Guidelines
- Main Connections: Requires suitable short-circuit and overload protection. Refer to the technical product data sheet or relevant configuration manuals for specific guidance on free-standing contactors or device combinations (e.g., with overload relays or circuit breakers).
- Auxiliary Connections: Short-circuit and overload protection of auxiliary contacts should follow recommendations in the technical product data sheet.
- Control Supply Voltage: Protection for control supply voltage connections must adhere to relevant standards and regulations, considering load characteristics (inrush current, switch-on power, holding power). Overvoltage protection can be achieved by retrofitting RC elements, varistors, diodes, or diode assemblies (ordered separately as accessories).
Connection Methods:
- Main Circuit: Screw terminals with box terminal. Direct connection with cable lugs possible when the box terminal is removed.
- Auxiliary & Control Circuit: Screw terminals.
Motor Protection Compatibility:
For overload protection, the Siemens 3RT2346-1AN20 is compatible with 3RU2 thermal overload relays or 3RB3 electronic overload relays, which can be directly mounted onto the contactor.
Accessories & Spare Parts:
A range of accessories and spare parts are available to enhance the functionality and extend the lifespan of the Siemens 3RT2346-1AN20, including:
- Surge suppressors (RC elements, varistors, diodes, diode assemblies)
- Additional auxiliary switches
- Replacement solenoid coils
- For a comprehensive list, refer to "Accessories and spare parts for SIRIUS 3RT2 contactors and SIRIUS 3RH2 contactor relays."
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