Siemens 3RT2037-1NB34 SIRIUS Power Contactor, 65A, 30kW, 20-33V AC/DC Coil, 2NO+2NC, Size S2 Original Brand New

Overview: Siemens 3RT2037-1NB34 SIRIUS Power Contactor (65A, 30kW)

The Siemens 3RT2037-1NB34 is a high-performance, 3-pole power contactor from the trusted SIRIUS 3RT2 family, designed for reliable switching of motors up to 65 A (AC-3e/AC-3) and 30 kW at 400 V. This size S2 industrial contactor features a wide-range, energy-efficient control voltage of 20-33 V AC/DC with an integrated varistor for coil protection against voltage surges. It is an essential component for motor control, load feeders, and various automation applications.

Key Features & Technical Specification

• Product Number: 3RT2037-1NB34 (Siemens)
• Contactor Size: S2
• Operating Current (AC-3e/AC-3): 65 A
• Motor Power Rating (400 V): 30 kW
• Poles: 3-pole main circuit
• Control Coil Voltage: 20-33 V AC/DC (Wide Range)
• Coil Protection: Integrated varistor
• Auxiliary Contacts: 2 Normally Open (NO) + 2 Normally Closed (NC)
• Main & Auxiliary Connection Type: Screw terminal
• Auxiliary Switch: Removable auxiliary switch block
• Product Line: SIRIUS 3RT2

Benefit

1. High Reliability: Built to Siemens SIRIUS standards, ensuring long mechanical and electrical service life for critical applications.
2. Versatile Control: The wide 20-33 V AC/DC coil allows for flexible integration into control systems, simplifying stock-keeping and design.
3. Surge Protection Included: The integrated varistor protects the coil and surrounding circuitry from destructive voltage spikes, enhancing system durability.
4. Easy Wiring: Secure and simple screw terminals for the main and auxiliary circuits ensure quick and reliable installation and maintenance.
5. Integrated Feedback: The included 2 NO + 2 NC auxiliary contacts offer ample signaling and interlocking options for your control logic.

Function & Application

This Siemens 3RT2037-1NB34 power contactor is primarily used for switching three-phase AC motors (up to 30kW) and other resistive or inductive loads. Its core functions include:

• Starting and Stopping Motors: Provides a safe and remote means of connecting and disconnecting the motor from the power supply.
• System Interlocks: The auxiliary contacts are vital for controlling other components in the control panel or providing feedback on the contactor’s status to a PLC or control system.
• Machinery & Industrial Automation: Ideal for use in pump stations, conveyor systems, HVAC, packaging machinery, and general industrial load switching where high current and reliable operation are required.

Installation & Compatibility

The Size S2 form factor is part of the modular SIRIUS system, ensuring easy mounting and seamless combination with other Siemens components like overload relays (e.g., SIRIUS 3RU2) and circuit breakers to form a complete, factory-tested load feeder. The removable auxiliary switch facilitates easy configuration.

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