Siemens 3RT2045-1NB34 Power Contactor, 80A, 37kW/400V, 3-Pole, 20–33V AC/DC, Auxiliary Contacts Original Brand New

Overview

The Siemens 3RT2045-1NB34 Power Contactor is a high-performance switching device designed for demanding industrial applications. Part of the renowned Siemens SIRIUS 3RT2 series, this 3-pole contactor ensures reliable motor control and long-lasting performance in AC-3 and AC-3e duty. With a compact S3 size design and integrated varistor protection, it provides safe and efficient operation for motors up to 37 kW at 400V.

This model is engineered for flexibility, featuring a control voltage range of 20–33V AC/DC (50/60Hz), and auxiliary contacts (2NO + 2NC) that enhance control versatility. The screw terminal connection ensures secure wiring and easy maintenance, while the removable auxiliary switch block provides adaptability for various control configurations.

Key Features & Technical Specification

• Model Number: Siemens 3RT2045-1NB34

• Product Type: Power Contactor

• Rated Operational Current (Ie): 80 A (AC-3 / AC-3e)

• Rated Operational Power: 37 kW at 400 V

• Poles: 3-Pole

• Control Voltage: 20–33V AC/DC, 50/60 Hz

• Auxiliary Contacts: 2 Normally Open (2NO) + 2 Normally Closed (2NC)

• Integrated Varistor: Yes (for coil protection)

• Connection Type: Screw Terminal

• Size: S3

• Auxiliary Switch: Removable

• Brand: Siemens

• Series: SIRIUS 3RT2

Benefit

• High Reliability: Siemens engineering ensures consistent performance and reduced downtime.
• Flexible Control Voltage: Operates efficiently across AC and DC ranges (20–33V).
• Enhanced Safety: Integrated varistor protects against voltage surges.
• Compact Design: S3 frame size saves space in control panels.
• Easy Installation: Screw terminals and modular accessories simplify wiring.
• Energy Efficient: Optimized coil system minimizes power consumption.

Functions & Applications

The Siemens 3RT2045-1NB34 is ideal for:

• Motor starters and control circuits

• Industrial automation systems

• Machine tools and conveyors

• HVAC and pump applications

• General-purpose industrial control panels

It supports AC-3e and AC-3 duty, making it suitable for direct-on-line starting of induction motors and general switching operations in industrial environments.

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