Siemens 3RT1076-2NP36 Power Contactor, 500A, 250kW, Busbar/Spring-Loaded Original Brand New

Overview

The Siemens 3RT1076-2NP36 is a high-performance power contactor designed for demanding motor and load switching applications, particularly in industrial automation and power distribution. Part of the robust SIRIUS line, this 3-pole contactor handles significant power—up to 500 A (AC-3e/AC-3) and 250 kW at 400 V.

It features a versatile electronic drive for reliable operation and a wide control voltage range (Uc​) of 200-277 V AC/DC, offering flexibility for global installations. Crucially, it includes an integrated 24 V DC PLC input, simplifying direct integration into modern control systems. The main circuit uses a secure busbar connection, while the control and auxiliary circuits employ spring-loaded terminals for fast, vibration-proof wiring.

Key Features & Technical Specifications

• Product Number: 3RT1076-2NP36
• Contactor Type: Power Contactor (AC-3e/AC-3)
• Current Rating: 500 A
• Power Rating: 250 kW at 400 V
• Poles: 3-pole
• Control Voltage (Uc​): 200-277 V AC (50-60 Hz) / DC
• Drive: Electronic
• PLC Input: 24 V DC
• Auxiliary Contacts: 2 NO + 2 NC
• Main Circuit Connection: Busbar
• Control/Auxiliary Connection: Spring-Loaded Terminal

Benefit

1. High-Capacity Performance: Safely and efficiently switch heavy-duty loads with a 500 A current rating, ideal for large motors and critical applications.
2. Global Versatility: The wide-range 200-277 V AC/DC control voltage (Uc​) reduces inventory complexity and ensures compatibility across various supply grids.
3. Seamless Integration: The dedicated 24 V DC PLC input allows direct, low-power control from programmable logic controllers (PLCs) without needing intermediate relays.
4. Reliable Connection: Busbar connections on the main circuit provide robust power transmission, while spring-loaded terminals ensure quick, reliable, and maintenance-free auxiliary wiring.
5. Enhanced Durability: The electronic drive offers high switching accuracy and extended mechanical/electrical life compared to conventional coil drives.

Function

The primary function of the 3RT1076-2NP36 is to reliably switch and control high-power electrical loads, primarily AC motors in industrial environments.

• Motor Control: Manages the ON/OFF switching of motors up to 250 kW (400 V).
• Load Isolation: Provides a safe method for connecting and disconnecting power from machinery.
• Status Feedback: The integrated 2 NO + 2 NC auxiliary contacts provide essential signaling for control systems, confirming the contactor’s status (open or closed).

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