The Siemens 3RU2136-4QB00-8K is a genuine SIRIUS 3RU2 Thermal Overload Relay designed to provide reliable overload and phase-failure protection for three-phase induction motors. It features an adjustable current range of 47–57 A, a Class 10 tripping characteristic, and a Size S2 frame, making it ideal for protecting industrial motors from overheating caused by overload conditions. Designed for direct contactor mounting, this relay integrates seamlessly with compatible Siemens S2 contactors to create a compact and efficient motor starter assembly. It is equipped with screw terminals for both the main and auxiliary circuits and supports manual and automatic reset for flexible operation and simplified maintenance.
The Siemens 3RU2136-4QB00-8K is widely used in Motor Control Centers (MCCs), industrial control panels, OEM machinery, pumps, compressors, conveyor systems, HVAC equipment, water treatment plants, and manufacturing industries. Its temperature-compensated thermal protection accurately detects overload and phase-failure conditions, helping reduce motor damage, minimize downtime, and improve overall equipment reliability.
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.
The Siemens 3RU2136-4QB00-8K is a thermal overload relay designed to protect three-phase motors from overload and phase-failure conditions. It is intended for direct mounting on compatible Siemens S2 contactors.
The relay features an adjustable overload setting from 47 A to 57 A, making it suitable for a wide range of industrial motor applications.
It is designed for direct contactor mounting and includes screw terminals for both the main circuit and auxiliary circuit, ensuring secure and reliable electrical connections.
Yes. The 3RU2136-4QB00-8K supports both manual and automatic reset, allowing flexible operation based on 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 for OEMs, panel builders, contractors, and industrial customers.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2136-4QB00-8K |
| SKU | 3RU2136-4QB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | QB008K |
| Current Setting Range | 63–70 A |
| Relay Size | S2 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Rated Insulation Voltage | 1000 V |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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