Siemens 3RT2337-3NB30 Contactor 4-Pole, 110A AC-1, S2 Size, Spring-Loaded Terminal Original Brand New

Overview: Siemens 3RT2337-3NB30 4-Pole AC-1 Contactor

The Siemens 3RT2337-3NB30 is a high-performance 4-pole contactor designed for efficient and reliable switching of non-inductive or weakly inductive loads (AC-1 applications). With a robust current rating of 110 A at 400 V / 40 °C, this Size S2 contactor is ideal for various industrial applications, including disconnecting loads, managing power generation plants, and transfer switching. Its versatile 20-33 V AC/DC control voltage, integrated varistor for surge suppression, and combination of screw and spring-loaded terminals make it a flexible and secure choice for modern control systems.

Key Benefit

• Reliable AC-1 Switching: Specifically designed for switching non-inductive or weakly inductive loads, ensuring stable operation in demanding environments.
• Enhanced Surge Protection: Integrated varistor provides effective damping of opening surges in the coil, protecting the contactor and extending its lifespan.
• Flexible Control Voltage: Wide 20-33 V AC/DC operating mechanism accommodates various power supply configurations.
• Dual Connection Methods: Main circuit features robust screw terminals, while auxiliary and control circuits utilize convenient spring-loaded terminals for quick and secure wiring.
• Space-Saving Design: Compact S2 size allows for efficient integration into control panels.
• Integrated Auxiliary Contacts: Comes with 1 NO + 1 NC auxiliary contacts for versatile signaling and interlocking possibilities.
• High Contact Reliability: Auxiliary contacts are optimized for low voltages and currents (≤ 110 V, ≤ 100 mA), ensuring reliable operation in solid-state circuits.
• Compliance with Standards: Adheres to IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, guaranteeing quality and safety.

Function & Features:

• AC-1 Application: Suited for 4-pole switching of resistive loads, heating, or lighting.
• Integrated Varistor: Damps voltage peaks during coil de-energization, improving system stability and component longevity.
• Auxiliary Contacts (1 NO + 1 NC): Provides immediate feedback on contactor status for control and monitoring systems.
• Main Circuit Screw Terminals: Ensures strong, reliable connections for high-current power circuits.
• Auxiliary & Control Circuit Spring-Loaded Terminals: Offers vibration-proof and maintenance-free connections, speeding up installation.
• Size S2: Standardized form factor for easy integration and compatibility within Siemens SIRIUS modular system.
• Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A, ensuring reliable operation in industrial settings.
• Motor Protection Compatibility: Can be combined with 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection (for AC-3 variants, not primarily this AC-1 model, but part of the 3RT23 series family).
• Expandable Auxiliary Switches: Basic unit can be expanded with additional auxiliary switches to meet specific application requirements.
• Replaceable Solenoid Coil: Allows for easy maintenance and extends the operational life of the contactor (for 3RT233 contactors).

Standards Compliance & Protection:

The Siemens 3RT2337-3NB30 adheres to international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), ensuring high levels of safety and performance. Proper protection of connections against short circuits, overload, and overvoltage is crucial for reliable operation. Refer to the technical product data sheet for specific guidance on protecting free-standing contactors and device combinations (e.g., with overload relays or circuit breakers). For control circuit protection, consider suitable power supplies with current-limiting functions and appropriate circuit breakers for equipment in control circuits.

Connection Methods:

• Main Circuit: Features robust screw terminals with a box terminal design. Direct connection with cable lugs is possible after removing the box terminal for specific 3RT234 models (this 3RT233 model uses screw terminals).
• Auxiliary and Control Circuit: Utilizes convenient and reliable spring-loaded terminals, providing secure and vibration-resistant connections.

Application

The Siemens 3RT2337-3NB30 contactor is ideally suited for:

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

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