Siemens SIRIUS 3RT2036-3KB40 Power Contactor 51A, 22kW, 24V DC with Varistor Original Brand New

Overview

The Siemens SIRIUS 3RT2036-3KB40 is a high-performance power contactor designed for the reliable switching of motors and other industrial loads. This robust 3-pole contactor is rated for AC-3e/AC-3 operation at up to 51 A and 22 kW at 400 V. Its compact design and advanced features make it a perfect solution for modern industrial automation systems, especially those controlled by PLCs. The integrated varistor provides superior surge protection for the 24 V DC control coil, ensuring long-term durability and operational stability.

Key Features & Benefit

• High Performance: Rated for 51 A and 22 kW, this contactor handles significant power loads with ease, ensuring reliable motor control.
• Integrated Surge Protection: The built-in varistor protects the 24 V DC control coil from voltage spikes, extending the product’s lifespan and preventing damage to sensitive control components.
• PLC-Compatible Design: The 24 V DC control coil and a wide control voltage range of 0.8−1.2×Uc​ make it perfectly suited for direct connection to PLC outputs, simplifying wiring and reducing complexity.
• Dual-Terminal System: The main circuit utilizes reliable screw terminals for secure power connections, while the control and auxiliary circuits feature convenient spring-loaded terminals, enabling fast and error-free wiring.
• Versatile Auxiliary Contacts: Equipped with 1 normally open (NO) and 1 normally closed (NC) auxiliary contact, providing flexibility for signaling, interlocking, and other control circuit functions.
• Compact Frame Size: The S2 frame size offers a balance of high power handling capability and a space-saving design, allowing for denser control panel layouts.
• Durability and Reliability: Part of the trusted Siemens SIRIUS family, this contactor is built to the highest quality standards, ensuring long-lasting and maintenance-free operation in demanding industrial environments.

Function

• Switches electrical loads, particularly three-phase AC motors.
• Establishes and interrupts electrical circuits in industrial applications.
• Used in conjunction with overload relays to create motor starters.
• Provides signal outputs for circuit status monitoring via its auxiliary contacts.
• Acts as a key component in control circuits for pumps, fans, conveyors, and more.

Technical Specification

• Product Number: 3RT2036-3KB40
• Contactor Type: Power Contactor
• Operating Current (AC-3e/AC-3): 51 A
• Operating Power (AC-3e/AC-3): 22 kW at 400 V
• Poles: 3
• Control Voltage: 24 V DC
• Control Voltage Range: 0.8−1.2×Uc​
• Auxiliary Contacts: 1 NO + 1 NC
• Main Circuit Connection: Screw Terminals
• Control/Auxiliary Connection: Spring-Loaded Terminals
• Integrated Protection: Varistor
• Frame Size: S2
• Manufacturer: Siemens
• Series: SIRIUS 3RT2

Application

The Siemens 3RT2036-3KB40 is widely used in:

• Motor control centers (MCCs)
• Industrial machinery
• Heating, ventilation, and air conditioning (HVAC) systems
• Pump stations
• Conveyor systems
• Automation and robotics
• All industrial applications requiring reliable switching of 3-phase AC loads.

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