Overview: The SIRIUS 3RT2 High-Performance Power Contactor

The Siemens 3RT2036-1NB30-0CC0 is a highly efficient and compact SIRIUS 3RT2 series power contactor designed for industrial motor switching and load applications. This 3-pole contactor in Size S2 is rated for switching motors up to 22 kW at 400 V (AC-3/AC-3e) and handles a rated operational current of 51 A. Its versatile control circuit features a wide-range coil for both 20-33 V AC/DC operation, ensuring flexibility in control system design. For enhanced reliability and lifespan, it comes with an integrated varistor to suppress coil voltage peaks.

Key Technical Specifications

• Article Number: 3RT2036-1NB30-0CC0
• Product Series: SIRIUS 3RT2
• Contactor Size: S2
• Poles: 3-pole
• Operational Current (AC-3/AC-3e, 400V): 51 A
• Motor Power Rating (AC-3/AC-3e, 400V): 22 kW
• Control Coil Voltage: 20-33 V AC/DC (50/60 Hz)
• Auxiliary Contacts: 1 NO (Normally Open) + 1 NC (Normally Closed)
• Connection Type: Main and auxiliary circuit with Screw Terminals
• Protection: Integrated varistor surge suppressor
• Feature: Communication-capable (can be integrated into communication systems via function modules – module not included)

Benefit

1. High Versatility (AC/DC Coil): The wide-range $20-33\text{V AC/DC}$ coil minimizes variations and simplifies inventory, making it suitable for both AC and DC control systems.
2. Increased System Reliability: The integrated varistor effectively dampens surge voltages on the coil, protecting sensitive control electronics and extending the contactor’s service life.
3. Future-Proof Integration (Communication-Capable): Ready for modern automation systems, this contactor supports connection of optional communication function modules, enabling data exchange, diagnostics, and remote control.
4. Robust and Compact: Part of the reliable SIRIUS family, the S2 size offers a powerful switching solution in a space-saving design with a high mechanical service life.
5. Easy and Secure Wiring: Equipped with durable screw terminals for straightforward and reliable connection of main and auxiliary circuits.

Functions and Applications

This Siemens power contactor is primarily used for:

• Switching 3-phase asynchronous motors (direct-on-line starting).
• Controlling resistive loads.
• Serving as a reliable switching element in industrial control panels, HVAC systems, pumping stations, conveyor systems, and general machine building where robustness and performance are essential.

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