Siemens Thermal Overload Relay 36–50 A, Class 10, Size S3, Contactor Mounting – 3RU2146-4HB00-8K

Product Description

The Siemens 3RU2146-4HB00-8K is a genuine SIRIUS 3RU2 Thermal Overload Relay engineered to provide dependable overload and phase-failure protection for three-phase induction motors. With an adjustable current range of 36–50 A, Class 10 tripping characteristic, and Size S3 frame, this relay ensures accurate motor protection against overheating and excessive current. Designed for direct contactor mounting, it creates a compact motor starter assembly while reducing panel wiring and installation time. The relay features screw terminals for both the main and auxiliary circuits and supports manual and automatic reset for flexible operation and simplified maintenance.

The Siemens 3RU2146-4HB00-8K is ideal for 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 protection accurately detects overload and phase-failure conditions, helping prevent motor damage, reduce downtime, and improve system reliability in demanding industrial environments.

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: 3RU2146-4HB00-8K
• Adjustable Current Range: 36–50 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 Industries
• 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 valuable panel space
• Easy installation and maintenance
• Accurate Class 10 thermal tripping performance
• Reliable operation in demanding industrial environments
• Genuine Siemens quality for long-lasting performance

Frequently Asked Questions (FAQs)

Q1. What is the Siemens 3RU2146-4HB00-8K used for?

The 3RU2146-4HB00-8K is a thermal overload relay designed to protect three-phase motors from overload and phase-failure conditions. It is designed for direct mounting on compatible Siemens S3 contactors.

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

The relay offers an adjustable current range of 36 A to 50 A, making it suitable for various industrial motor protection applications.

Q3. What type of mounting does this relay use?

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

Q4. Does the Siemens 3RU2146-4HB00-8K support manual and automatic reset?

Yes. The relay supports both manual and automatic reset, allowing users to select the most suitable reset mode for their application.

Q5. Why buy Siemens 3RU2146-4HB00-8K 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.