The Siemens SIRIUS Thermal Overload Relay – 3RU2136-4JB00-8K is a reliable motor protection relay designed to protect three-phase motors against overload, phase failure, and excessive current in industrial motor control applications. As part of the trusted Siemens SIRIUS 3RU2 series, this thermal overload relay provides dependable motor protection by disconnecting the motor during overload conditions, helping prevent overheating, equipment damage, and unexpected downtime. It is designed for S2-size contactor mounting and features Class 10 tripping characteristics, making it suitable for a wide range of industrial motor starter applications.
The Siemens 3RU2136-4JB00-8K 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, machine tools, HVAC equipment, manufacturing plants, OEM machinery, and industrial automation systems. It delivers reliable overload protection, improves motor reliability, minimizes maintenance costs, and extends the operational life of motors and electrical equipment.
Manufactured with Siemens' advanced engineering and robust construction, this SIRIUS thermal overload relay offers reliable tripping performance, long service life, and easy installation. It is trusted by panel builders, OEMs, electrical contractors, maintenance engineers, and industrial professionals for dependable motor protection in demanding industrial environments.
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 S2 contactor mounting
Protects motors from overheating
Accurate and dependable thermal tripping
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
OEM Machinery
Industrial Automation Systems
Protects motors against overload conditions
Detects phase failure for improved motor safety
Reduces motor damage and maintenance costs
Extends motor service life
Improves equipment reliability
Minimizes unexpected downtime
Supports continuous industrial operation
Easy integration with Siemens contactors
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.
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 helps prevent motor damage caused by excessive current and overheating, improving motor life and reducing maintenance costs.
It is widely used in manufacturing plants, water treatment facilities, HVAC systems, cement plants, steel plants, process industries, 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 Number | 3RU2136-4JB00-8K |
| Product Type | Thermal Overload Relay |
| Adjustable Current Range | 54–65 A |
| Tripping Class | Class 10 |
| Relay Size | S2 |
| Mounting Type | Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Reset Type | Manual / Automatic |
| Rated Insulation Voltage | 690 V |
| Rated Surge Withstand Voltage | 6 kV |
| Operating Temperature | -40°C to +70°C |
| Storage Temperature | -55°C to +80°C |
| Maximum Installation Altitude | 2000 m |
| Degree of Protection | IP20 |
| Approximate Weight | 0.344 kg |
| Application | Thermal Motor Overload Protection |
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