Siemens SIRIUS 3RT2036-3KB44-3MA0 Power Contactor, 51A, 22kW, 24V DC, S2 Frame, Varistor Original Brand New

Overview

The Siemens SIRIUS 3RT2036-3KB44-3MA0 is a high-performance power contactor engineered for reliable switching of electrical loads in industrial automation and control systems. This 3-pole contactor is designed for AC-3e/AC-3 applications, handling a robust 51 A current and a motor rating of 22 kW at 400 V. Its compact S2 frame size makes it ideal for space-constrained installations without compromising on power. The integrated varistor provides superior surge protection, extending the lifespan of both the contactor and connected equipment.

Key Features & Benefit

• High Current and Power Rating: Capable of switching 51 A and up to 22 kW motors, making it suitable for a wide range of industrial applications.
• Integrated Varistor: The built-in varistor efficiently suppresses voltage spikes, protecting the contactor’s coil and sensitive PLC outputs from damage.
• Dual-Terminal System: Features screw terminals for the main circuit, ensuring a secure and reliable power connection, and spring-loaded terminals for the control and auxiliary circuits, offering quick, tool-free wiring and vibration resistance.
• PLC Compatibility: Specifically designed to be suitable for direct connection to PLC outputs, simplifying control system integration.
• 2 NO + 2 NC Auxiliary Contacts: Provides flexible control and signaling options, with captive auxiliary switches for easy installation and maintenance.
• Durable Design: The robust construction and S2 frame size ensure long-term reliability and performance in demanding industrial environments.
• Efficiency: The low power consumption of the 24V DC coil helps in reducing energy costs.

Function

The Siemens 3RT2036-3KB44-3MA0 power contactor serves as an electromagnetic switch for controlling electric motors and other resistive or inductive loads. When the 24V DC control signal is applied to the coil, it closes the main power contacts, allowing current to flow to the load. The auxiliary contacts simultaneously change state, providing feedback to the control system. The spring-loaded terminals on the control side ensure a secure connection even under high vibration, while the screw terminals on the main circuit handle the high current demands with confidence. The integrated varistor acts as a crucial protective element, diverting harmful voltage surges away from the coil.

Technical Specification

• Product Type: Power Contactor
• Product Number: 3RT2036-3KB44-3MA0
• Main Poles: 3-pole
• Rated Current (AC-3e/AC-3): 51 A
• Motor Power (AC-3): 22 kW at 400 V
• Operating Voltage: 24 V DC
• Control Voltage Range: 0.8 to 1.2 * Uc
• Coil Type: DC with integrated varistor
• Auxiliary Contacts: 2 NO + 2 NC (Normally Open + Normally Closed)
• Main Circuit Termination: Screw Terminals
• Control & Auxiliary Circuit Termination: Spring-Loaded Terminals
• Frame Size: S2

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