Siemens SIRIUS 3RT2036-1KB44 Power Contactor, 3-Pole, 51A, 22kW, 24V DC Coil, S2 Frame Original Brand New

Overview: Siemens 3RT2036-1KB44 SIRIUS Power Contactor

The Siemens 3RT2036-1KB44 is a high-performance 3-pole power contactor from the globally renowned SIRIUS 3RT2 series. Designed for switching electric motors and other heavy-duty industrial loads, this contactor offers exceptional reliability and a compact footprint (Size S2). It is specifically engineered to be suitable for PLC outputs, making it an ideal choice for modern automated control systems.

Key specifications include an operating current of 51 A for AC-3/AC-3e duty and a motor power rating of 22 kW at 400 V. The control circuit operates on a 24 V DC voltage, featuring an integrated varistor for effective coil protection against voltage spikes.

Function

The 3RT2036-1KB44 acts as an electrical switch used to control the flow of power to loads, primarily three-phase motors. The 24V DC control signal from a PLC or control circuit energizes the coil, closing the main power contacts and connecting the load to the line supply. The integrated varistor suppresses inductive voltage peaks generated when the coil is de-energized, protecting the control circuitry (especially sensitive PLC outputs).

Benefits & Features

1. Optimized for Automation (PLC Compatible): Designed with a $24\text{ V DC}$ coil and suitable characteristics for direct connection to low-power PLC digital outputs (e.g., $2\text{A}$ outputs), simplifying system design and wiring.
2. Built-in Surge Protection: The integrated varistor provides essential coil suppression, eliminating the need for external protection components and saving installation time and panel space.
3. High Reliability & Durability: As part of the SIRIUS 3RT2 range, it offers a high mechanical and electrical service life, minimizing downtime in industrial applications.
4. Easy Installation & Wiring: Features user-friendly screw terminals for secure and robust main and auxiliary circuit connections.
5. Flexible Auxiliary Contacts: Includes pre-assembled $2\text{ NO}+2\text{ NC}$ auxiliary contacts, providing immediate feedback and interlocking capabilities for complex control schemes. The block is also removable for potential modifications.
6. Compact Size S2: High power switching capacity in a standardized, space-saving frame size.

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