Siemens Thermal Overload Relay 28–40 A, Class 10, Size S3, Contactor Mounting – 3RU2146-4FB00-8K

Product Description

The Siemens 3RU2146-4FB00-8K is a genuine SIRIUS 3RU2 Thermal Overload Relay designed to provide reliable overload and phase-failure protection for three-phase induction motors. Featuring an adjustable current range of 28–40 A, Class 10 tripping characteristic, and Size S3 frame, this thermal overload relay is engineered for direct contactor mounting, creating a compact and efficient motor starter solution. It is equipped with screw terminals for both the main and auxiliary circuits and supports manual and automatic reset, ensuring dependable motor protection, easy installation, and reduced maintenance.

The Siemens 3RU2146-4FB00-8K is widely used in Motor Control Centers (MCCs), industrial control panels, OEM machinery, pumps, compressors, conveyor systems, HVAC equipment, water treatment plants, and manufacturing facilities. Its temperature-compensated thermal tripping mechanism accurately responds to overload and phase-failure conditions, helping prevent motor damage, reduce downtime, and improve operational reliability. The compact S3 design makes it an excellent choice for industrial motor protection applications.

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 offer 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: 3RU2146-4FB00-8K
• 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 Durable 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 Industries
• Process Automation
• Industrial Motor Protection

Benefits

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

Frequently Asked Questions (FAQs)

Q1. What is the Siemens 3RU2146-4FB00-8K used for?

The 3RU2146-4FB00-8K is a thermal overload relay designed to protect three-phase motors against overload and phase-failure conditions. It is designed for direct mounting on Siemens S3 contactors.

Q2. What is the adjustable current range?

The relay has an adjustable overload setting from 28 A to 40 A, making it suitable for a wide range of industrial motor applications.

Q3. What type of mounting and terminals does it use?

It is designed for direct contactor mounting and features screw terminals for both the main circuit and auxiliary circuit.

Q4. Does the Siemens 3RU2146-4FB00-8K support manual and automatic reset?

Yes. The relay supports both manual and automatic reset, providing flexibility for different industrial motor control applications.

Q5. Why buy Siemens 3RU2146-4FB00-8K from SB Smart Faridabad?

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