The Siemens SIRIUS Thermal Overload Relay – 3RU2146-4MB0 is a high-performance motor protection relay designed to safeguard three-phase motors against overload, phase failure, and overheating in industrial motor control applications. As part of the trusted Siemens SIRIUS 3RU2 series, this thermal overload relay provides accurate thermal tripping to protect motors from excessive current, helping prevent equipment damage and ensuring reliable operation. It is designed for S3-size contactor mounting and features a Class 10 tripping characteristic, making it suitable for standard industrial motor starting applications. (support.industry.siemens.com)
The Siemens 3RU2146-4MB0 Thermal Overload Relay is widely used in Motor Control Centers (MCC), Direct-On-Line (DOL) starters, Star-Delta starters, industrial control panels, pump control systems, compressors, conveyor systems, HVAC equipment, machine tools, manufacturing plants, OEM machinery, and industrial automation systems. It delivers dependable motor protection, improves equipment reliability, reduces maintenance costs, and minimizes unplanned downtime in demanding industrial environments.
Manufactured with Siemens' advanced engineering and industrial-grade quality, this SIRIUS thermal overload relay offers long service life, reliable performance, and easy integration with compatible Siemens contactors. It is trusted by panel builders, OEMs, electrical contractors, maintenance engineers, and industrial professionals for reliable motor protection.
At SB Smart, we supply genuine Siemens SIRIUS Thermal Overload Relays, motor protection devices, and industrial electrical products with competitive pricing, expert technical support, bulk order assistance, and fast PAN India delivery.
Genuine Siemens SIRIUS Thermal Overload Relay
Reliable overload and phase failure protection
Class 10 tripping characteristic
Designed for S3-size contactor mounting
Accurate thermal overload protection
Helps prevent motor overheating
Durable industrial-grade construction
Easy installation and maintenance
Long operational service life
Trusted Siemens engineering and quality
Motor Control Centers (MCC)
Direct-On-Line (DOL) Starters
Star-Delta Starters
Industrial Control Panels
Pump Control Systems
Compressor Panels
Conveyor Systems
Machine Tools
HVAC Systems
Manufacturing Plants
Water Treatment Plants
Cement Plants
Steel Plants
Mining Industry
OEM Machinery
Industrial Automation Systems
Protects motors from overload and overheating
Detects phase failure for enhanced motor safety
Reduces equipment damage and maintenance costs
Extends motor service life
Improves operational reliability
Minimizes unexpected downtime
Easy integration with Siemens motor starters
Suitable for continuous industrial applications
Cost-effective motor protection solution
100% Genuine Siemens Products
Competitive Industrial Pricing
Expert Technical Support
Bulk Order Assistance
Fast PAN India Delivery
Secure Packaging
Trusted Industrial Electrical Supplier
GST Invoice Available
Responsive Customer Support
It is used to protect three-phase motors against overload, overheating, and phase failure in industrial motor control systems. (support.industry.siemens.com)
It is commonly installed in MCC panels, DOL starters, star-delta starters, industrial control panels, pump systems, compressors, conveyors, and OEM machinery.
A thermal overload relay protects motors from excessive current and overheating, helping extend motor life, reduce maintenance costs, and improve operational safety.
It is widely used in manufacturing plants, water treatment facilities, mining, cement plants, steel plants, HVAC systems, and industrial automation applications.
Yes. SB Smart supplies genuine Siemens SIRIUS thermal overload relays with competitive pricing, expert technical support, bulk order assistance, and fast PAN India delivery.
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Series | SIRIUS 3RU2 |
| Model | 3RU2146-4MB0 |
| Product Type | Thermal Overload Relay |
| Adjustable Current Range | 80–100 A |
| Tripping Class | Class 10 |
| Relay Size | S3 |
| Mounting Type | Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Reset Type | Manual / Automatic |
| Number of Poles | 3 |
| Rated Insulation Voltage | 1000 V |
| Rated Surge Withstand Voltage | 8 kV |
| Operating Temperature | -40°C to +70°C |
| Storage Temperature | -55°C to +80°C |
| Relative Humidity | 10–95% |
| Maximum Installation Altitude | 2000 m |
| Net Weight | Approx. 0.62 kg |
| Application | Motor Overload Protection |
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