Siemens Thermal Overload Relay 28–40 A, Class 10, Size S3, Contactor Mounting – 3RU2146-4FB0

Product Description

The Siemens 3RU2146-4FB0 is a genuine SIRIUS 3RU2 Thermal Overload Relay designed to provide reliable overload and phase-failure protection for three-phase induction motors. It features an adjustable current setting range of 28–40 A, Class 10 tripping characteristic, and a Size S3 frame for dependable motor protection in industrial applications. Designed for direct contactor mounting, this relay integrates seamlessly with compatible Siemens S3 contactors, creating a compact and space-saving motor starter assembly. It is equipped with screw terminals for both the main and auxiliary circuits and supports manual and automatic reset, ensuring easy operation and maintenance.

The Siemens 3RU2146-4FB0 is widely used in Motor Control Centers (MCCs), industrial control panels, OEM machinery, pumps, compressors, conveyor systems, HVAC equipment, water treatment plants, and manufacturing industries. Its temperature-compensated thermal protection accurately detects overload and phase-failure conditions, helping prevent motor damage, minimize downtime, and improve equipment reliability. Built for continuous operation in demanding industrial environments, it delivers long-lasting performance and dependable motor protection.

At SB Smart, Faridabad, we supply 100% genuine Siemens SIRIUS Thermal Overload Relays, Contactors, Motor Protection Circuit Breakers (MPCB), Soft Starters, MCCBs, MCBs, PLCs, HMIs, VFDs, and Industrial Automation Products at competitive prices. We provide GST invoices, expert technical support, bulk order pricing, secure packaging, and fast delivery across Faridabad, Delhi NCR, Mumbai, Pune, Bengaluru, Chennai, Hyderabad, Ahmedabad, Kolkata, and all major cities in India.

Key Features

• Genuine Siemens SIRIUS 3RU2 Thermal Overload Relay
• Model: 3RU2146-4FB0
• Adjustable Current Range: 28–40 A
• Class 10 Tripping Characteristic
• Size S3
• Direct Contactor Mounting
• Main Circuit: Screw Terminal
• Auxiliary Circuit: Screw Terminal
• Manual and Automatic Reset
• Phase Failure Sensitive Protection
• Temperature-Compensated Operation
• Compact and Rugged Industrial Design
• Long Service Life

Applications

• Motor Control Centers (MCC)
• Industrial Control Panels
• OEM Machinery
• Pumps and Compressors
• Conveyor Systems
• HVAC Systems
• Water Treatment Plants
• Manufacturing Plants
• Process Automation
• Industrial Motor Protection

Benefits

• Protects motors from overload and phase-failure conditions
• Reduces motor damage and unplanned downtime
• Extends motor service life
• Compact contactor-mounted design saves panel space
• Quick and easy installation
• Accurate Class 10 thermal tripping
• Reliable performance in demanding industrial environments
• Genuine Siemens quality for long-term operation

Frequently Asked Questions (FAQs)

Q1. What is the Siemens 3RU2146-4FB0 used for?

The Siemens 3RU2146-4FB0 is a thermal overload relay designed to protect three-phase motors from overload and phase-failure conditions. It is intended for direct mounting on compatible Siemens S3 contactors.

Q2. What is the adjustable current range of this overload relay?

This relay offers an adjustable current setting from 28 A to 40 A, making it suitable for a wide range of industrial motor protection applications.

Q3. Does this relay support manual and automatic reset?

Yes. The 3RU2146-4FB0 supports both manual and automatic reset, providing flexibility for different industrial control systems.

Q4. What type of mounting and terminals does it use?

The relay is designed for direct contactor mounting and features screw terminals for both the main and auxiliary circuits, ensuring secure electrical connections.

Q5. Why buy Siemens 3RU2146-4FB0 from SB Smart Faridabad?

SB Smart, Faridabad offers 100% genuine Siemens industrial automation products, competitive pricing, GST invoices, expert technical support, bulk order discounts, and fast delivery across India for OEMs, panel builders, contractors, and industrial customers.