Siemens 3RT2337-1AK60 Contactor 4-Pole AC-1, 110A, 400V, 1NO+1NC Aux, S2 Size Original Brand New

Overview

The Siemens SIRIUS 3RT2337-1AK60 contactor is a high-performance electrical switching device, part of the renowned SIRIUS family of industrial control components. Specifically engineered for AC-1 applications, this 4-pole contactor is ideal for scenarios requiring the switching of resistive loads, heating, lighting, or general distribution circuits. Its compact S2 size, coupled with robust construction and precise engineering, ensures reliable operation and longevity in demanding industrial environments. Integrated 1 NO (normally open) and 1 NC (normally closed) auxiliary contacts provide flexible signaling and interlocking options for complex control systems.

Key Function & Application

The Siemens 3RT2337-1AK60 contactor serves critical functions in various electrical systems:

• Four-Pole AC-1 Switching: Primarily designed for switching weak or non-inductive loads (AC-1 duty), making it perfect for applications like resistive heaters, lighting circuits, or capacitive loads.
• Load Disconnection: Efficiently disconnects general loads or power generation plants from the electrical grid, ensuring safety and control.
• Transfer Switching: Can be integrated into systems for transfer switching, managing the flow of power between different sources or loads.
• Industrial Control Systems: Acts as a key switching element in industrial control panels, automation systems, and machinery.

Benefit

Choosing the Siemens 3RT2337-1AK60 contactor offers numerous advantages for your electrical installations:

• High Reliability: Built to Siemens’ exacting standards, ensuring consistent and dependable performance in critical applications.
• Versatile AC-1 Operation: Specifically optimized for resistive and slightly inductive loads, providing efficient power management.
• Integrated Auxiliary Contacts: The 1 NO + 1 NC auxiliary contacts offer immediate feedback and enable intricate control logic without additional modules.
• Flexible Coil Voltage: Compatible with both 110V AC (50 Hz) and 120V AC (60 Hz) control voltages, simplifying inventory and application.
• Robust Screw Terminals: Provides secure and reliable electrical connections for all circuits, minimizing installation time and maximizing safety.
• Compact S2 Size: Optimized for space-saving integration within control cabinets and electrical enclosures.
• Expandability: Supports the addition of further auxiliary switches for enhanced control and signaling capabilities.
• Global Standards Compliance: Adheres to international standards such as IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, ensuring broad applicability and safety.

Protection and Safety

The Siemens 3RT2337-1AK60 requires proper protection for its connections:

• Main Connections: Requires suitable short-circuit and overload protection. Refer to the technical product data sheet for specific recommendations for free-standing contactors or digital/configuration manuals for device combinations (contactor with overload relay or circuit breaker).
• Auxiliary Connections: Short-circuit and overload protection of auxiliary contacts should follow guidelines in the technical product data sheet.
• Control Supply Voltage: Protection should comply with relevant standards for control panels, considering cable dimensioning, power supply characteristics (current-limiting function, inrush, and holding power), and suitable protection devices like miniature or circuit breakers.
• Overvoltage Protection: The 3RT23 contactors can be retrofitted with surge suppressors (RC elements, varistors, diodes, or diode assemblies) to dampen opening surges in the coil. Note that damping may increase break and delay times.

Connection Methods

• Main Circuit: Utilizes robust screw terminals with a box terminal design. Direct connection with cable lugs is possible when the box terminal is removed.
• Auxiliary and Control Circuit: Equipped with reliable screw terminals for secure wiring.

Motor Protection

While the 3RT2337-1AK60 is an AC-1 contactor, for applications involving motor protection against overload, it can be combined with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays.

Operating Mechanism

This 3RT23 series contactor is available with a conventional AC operating mechanism, controlled via the A1-A2 control supply voltage connection with varying operating ranges (refer to the technical product data sheet for details).

Maintenance and Accessories

• Solenoid Coil Replacement: The solenoid coil for the 3RT2337-1AK60 can be replaced.
• Contact Replacement: Only the contacts for 3RT233 contactors (including this model) can be replaced.
• Auxiliary Switches: The basic unit includes two integrated auxiliary contacts (1 NO + 1 NC). It can be expanded with additional auxiliary switches, adhering to permissible configurations.
• Accessories & Spare Parts: A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors and 3RH2 contactor relays.

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