Siemens SIRIUS 3RT2336-1NB30 Power Contactor 60A, 4-Pole, AC-1, 20-33V AC/DC Coil, Integrated Varistor, S2 Size Original Brand New

Overview

The Siemens SIRIUS 3RT2336-1NB30 Contactor is a crucial component for efficient and safe control in industrial electrical systems. Part of the renowned SIRIUS family, this 4-pole contactor is specifically designed for switching weak or non-inductive loads (AC-1), making it ideal for applications like disconnecting loads, power generation plants from the grid, and transfer switching. Its integrated varistor ensures enhanced protection against overvoltage, while its robust construction adheres to leading international standards.

Key Features & Function

• AC-1 Switching: Optimized for switching non-inductive or slightly inductive loads, offering reliable performance in various applications.
• High Current Rating: Capable of handling 60 Amperes at 400V / 40°C, suitable for demanding industrial requirements.
• 4-Pole Configuration: Provides versatile switching options for multi-phase systems or complex load arrangements.
• Wide Voltage Control (20-33V AC/DC): Flexible control circuit compatibility, simplifying integration into diverse control systems.
• Integrated Varistor: Built-in surge suppression protects the coil from overvoltage spikes, extending the contactor’s lifespan and enhancing system reliability.
• Auxiliary Contacts (1 NO + 1 NC): Offers essential feedback and control possibilities for interlocking, signaling, and sequence control.
• Screw Terminals: Ensures secure and reliable electrical connections for main and auxiliary circuits.
• Compact S2 Size: Optimized dimensions for efficient use of panel space.
• Standards Compliance: Manufactured and tested in accordance with IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), guaranteeing international quality and safety.

Benefit

• Enhanced Reliability: Integrated varistor and adherence to international standards ensure stable and long-lasting operation.
• Versatile Application: Ideal for a wide range of AC-1 switching tasks, including critical power distribution and load management.
• Simplified Installation: Screw terminals provide straightforward and robust wiring.
• Space-Saving Design: The S2 size contributes to more compact control panel layouts.
• Comprehensive Protection: Designed with considerations for short-circuit, overload, and overvoltage protection of all connections, ensuring system integrity (refer to technical data sheet for detailed protection guidelines).
• High Contact Reliability: Auxiliary contacts are designed for reliable switching even at low voltages ($\le 110V$) and currents ($\le 100mA$), suitable for solid-state circuits.
• Flexible Control: Wide-range AC/DC operating mechanism provides broad compatibility with various control power supplies.

Technical Details & Protection

Standards:

• IEC 60947‑1
• IEC 60947‑4‑1
• IEC 60947‑5‑1 (auxiliary switches)

Protection of Device Connections: All connections, including main, auxiliary, and control supply voltage, require appropriate short-circuit and overload protection.

• Main Connections: For standalone contactor protection, refer to the technical product data sheet. For combinations with overload relays or circuit breakers (motor feeders), consult the Digital/Configuration Manual for load feeders.
• Auxiliary Connections: Specific protection information can be found in the technical product data sheet.
• Control Supply Voltage: Adhere to relevant standards for control panel configuration. Consider power supplies with current-limiting functions and select suitable protection devices based on contactor load characteristics (inrush current, switch-on power, holding power). Refer to “Control panel tip – Selecting and dimensioning suitable power supplies quickly and reliably” for further recommendations on miniature or circuit breakers.

Protection against Overvoltage at Control Supply Voltage: The 3RT23 series, including this model, can be retrofitted with external surge suppressors (RC elements, varistors, diodes, or diode assemblies) if not already integrated for coil damping. Note: Integrated varistor on this specific model provides inherent protection. Be aware that damping can slightly increase break and delay times.

Connection Methods

• Main Circuit: Screw terminals with box terminal.
• Auxiliary and Control Circuit: Screw terminals.

Electromagnetic Compatibility (EMC)

The contactor fulfills requirements for environment category A. When used with frequency converters, specific configuration notes in the Equipment Manual must be observed.

Contact Reliability of Auxiliary Contacts

The auxiliary contacts of 3RT contactors ensure high contact reliability, especially suitable for switching low voltages ($\le 110V$) and currents ($\le 100mA$), including solid-state circuits with currents $\ge 1mA$ at $\ge 17V$.

Motor Protection Integration

For overload protection, 3RU2 thermal overload relays or 3RB3 electronic overload relays can be directly mounted onto 3RT23 contactors.

Operating Mechanism Type

This 3RT23 contactor features a wide-range solid-state operating mechanism, enabling universal actuation with either AC or DC supply within the specified 20-33V range. Control is via connections A1 – A2.

Maintenance & Expandability

• Solenoid Coil Replacement: Possible for this 3RT233 model.
• Contact Replacement: Only the contacts for 3RT233 contactors can be replaced.
• Auxiliary Contact Expansion: The basic unit comes with two integrated auxiliary contacts (1 NO + 1 NC). It can be further expanded with additional auxiliary switches, adhering to permissible configurations. Refer to “Auxiliary switches, instantaneous → Overview” for detailed information.

Accessories and Spare Parts

A wide range of accessories and spare parts are available for 3RT23 contactors, including additional auxiliary switches, surge suppressors (though integrated varistor is present), and other components to customize or maintain your system. Please refer to the “Accessories and spare parts for SIRIUS 3RT2 contactors” documentation for a complete list.

Application

The Siemens 3RT2336-1NB30 contactor is ideally suited for:

• Four-pole switching of weak or non-inductive loads (AC-1).
• Disconnecting loads from the electrical grid.
• Switching power generation plants.
• Transfer switching applications.

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