Siemens 3RT2036-1NP34 Power Contactor, 51A, 22kW, 175-280V AC/DC, S2 Original Brand New

Overview

The Siemens SIRIUS 3RT2036-1NP34 power contactor is a high-performance, 3-pole switching device designed for reliably controlling electric motors and other loads up to 22 kW (at 400 V). As part of the globally approved SIRIUS modular system (3RT20 series), this contactor offers exceptional operational reliability and a space-saving, compact design in Size S2.

Key features include a highly versatile wide-range AC/DC operating coil (175-280 V AC/DC) with an integrated varistor for surge suppression, and a full complement of 2 NO + 2 NC auxiliary contacts with a removable auxiliary switch block. The proven screw terminal connections ensure robust and secure wiring in any industrial application.

Benefit & Advantages

1. Maximum Application Flexibility: The 175-280 V AC/DC wide-range coil allows for a single device to be used in various control voltage schemes, significantly simplifying inventory management and reducing stock complexity.
2. Increased Reliability: The integrated varistor provides crucial overvoltage protection for the coil, enhancing the lifespan and operational stability of the contactor and connected control circuits.
3. Space-Saving Design: Despite its high rating (51A, 22kW), the compact SIRIUS 3RT20 Size S2 design saves valuable panel space compared to older or alternative models.
4. Ready for Complex Control: Equipped with 2 NO and 2 NC auxiliary contacts, it offers ample switching points for complex control loops, interlocking, and status indication without requiring additional separate components.
5. Easy Installation: Features like the proven screw terminals and the option for connecting to the SIRIUS modular system accessories (e.g., link modules) make installation and wiring fast, simple, and maintenance-friendly.

Function / Application

The 3RT2036-1NP34 power contactor is primarily used for:

• Switching 3-Phase Motors: Ideal for starting, stopping, and controlling electric motors up to 22 kW in various industrial machinery and HVAC systems.
• Controlling Resistive Loads (AC-1): Suitable for switching high-current heating elements, lighting, and power supply circuits.
• Integration in Motor Feeders: Forms the core of the direct-on-line (DOL) starter, often combined with a suitable SIRIUS overload relay or motor protection circuit breaker.
• Use in Reversing Contactors: Can be paired with a second unit and a mechanical interlock for reversing motor applications.

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