The Siemens 3RU2146-4MB00-8K 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 80–100 A, Class 10 tripping characteristic, and Size S3 frame, this overload relay is designed for direct contactor mounting, creating a compact and efficient motor starter assembly. It comes with screw terminals for both the main and auxiliary circuits and supports manual and automatic reset, ensuring dependable motor protection while reducing downtime.
The Siemens 3RU2146-4MB00-8K is ideal for Motor Control Centers (MCCs), industrial control panels, OEM machinery, pumps, compressors, conveyors, HVAC systems, water treatment plants, and manufacturing industries. Its temperature-compensated thermal tripping mechanism accurately detects overload conditions and phase failure, helping extend motor life and improve system reliability. Built for demanding industrial environments, it offers long service life and consistent performance.
At SB Smart, Faridabad, we supply 100% genuine Siemens SIRIUS Thermal Overload Relays, Contactors, MPCBs, Soft Starters, MCCBs, MCBs, PLCs, HMIs, VFDs, and Industrial Automation Products at competitive prices. We provide GST invoices, expert technical support, bulk order discounts, secure packaging, and fast delivery across Faridabad, Delhi NCR, Mumbai, Pune, Bengaluru, Chennai, Hyderabad, Ahmedabad, Kolkata, and all major cities in India.
The 3RU2146-4MB00-8K is a thermal overload relay designed to protect three-phase motors from overload and phase-failure conditions. It mounts directly onto compatible Siemens contactors to create a compact motor starter.
The relay offers an adjustable overload setting from 80 A to 100 A, making it suitable for a wide range of industrial motor applications.
It is designed for contactor mounting and features screw terminals for both the main circuit and auxiliary circuit.
Yes. The 3RU2146-4MB00-8K supports both manual and automatic reset, providing flexibility for different industrial applications.
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.
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Series | SIRIUS 3RU2 |
| Model Number | 3RU2146-4MB00-8K |
| Product Type | Thermal Overload Relay |
| Current Setting Range | 80–100 A |
| Protection 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 |
| Surge Withstand Voltage | 8 kV |
| Operating Temperature | -40°C to +70°C |
| Relative Humidity | 10–95% |
| Maximum Installation Altitude | 2000 m |
| Net Weight | Approx. 0.62 kg |
| Application | Motor Overload Protection |
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