The Siemens 3RU2126-1DB00-8K is a high-quality Siemens SIRIUS Thermal Overload Relay designed for reliable motor overload protection in industrial electrical systems, motor control panels, automation equipment, and motor starter applications. Part of the proven SIRIUS 3RU2 series, this motor protection relay features an adjustable overload current range of 2.2–3.2A and a Class 10 thermal trip characteristic, making it suitable for protecting motors against excessive current and thermal overload conditions.
The 3RU2126-1DB00-8K thermal overload relay features a compact S0 frame size and is designed for contactor mounting with compatible Siemens SIRIUS S0 contactors. It provides a 3-pole main circuit, screw terminals for both the main and auxiliary circuits, and manual/automatic reset functionality. With a 690V insulation voltage, 6kV surge voltage resistance, and IP20 protection on the front and terminals, the relay is designed for dependable performance in industrial control environments.
This Siemens motor overload relay is ideal for building compact and reliable motor starter assemblies and can be used in DOL motor starters, pump control panels, compressor systems, conveyor systems, HVAC equipment, packaging machinery, machine tools, OEM control panels, water treatment plants, and factory automation systems. The adjustable 2.2–3.2A motor protection range allows the overload setting to be matched to the motor's rated current for dependable protection and improved operational reliability.
At SB Smart, Faridabad, we supply genuine Siemens SIRIUS thermal overload relays, motor protection relays, contactors, motor protection circuit breakers, soft starters, MCCBs, MCBs, and industrial automation products at competitive prices. We provide GST invoices, technical assistance, bulk-order support, secure packaging, and delivery across Faridabad, Delhi NCR, and major cities throughout India.
Genuine Siemens SIRIUS 3RU2 Thermal Overload Relay
Model: 3RU2126-1DB00-8K
Adjustable Motor Overload Protection Range: 2.2–3.2A
Class 10 Thermal Trip Characteristic
S0 Frame Size
Contactor Mounting
3-Pole Main Circuit
Main Circuit: Screw Terminals
Auxiliary Circuit: Screw Terminals
Manual/Automatic Reset
Rated Insulation Voltage: 690V
Surge Voltage Resistance: 6kV
Front Protection: IP20
Terminal Protection: IP20
Typical Total Power Loss: 5.2W
Temperature Compensation: -40°C to +60°C
Operating Ambient Temperature: -40°C to +70°C
Compatible with Siemens SIRIUS S0 Contactors
Compact Design for Industrial Motor Starters
Motor Control Centers (MCC)
DOL Motor Starters
Industrial Motor Control Panels
Motor Starter Panels
Pump Control Systems
Compressor Systems
Conveyor Systems
HVAC Motor Applications
Packaging Machinery
Machine Tools
Water Treatment Plants
OEM Control Panels
Industrial Automation Systems
Factory Automation
Process Control Equipment
Provides reliable thermal overload protection for motors
Adjustable 2.2–3.2A range enables accurate motor protection
Class 10 characteristic is suitable for motors with normal starting conditions
Helps protect motors against damaging overload conditions
Supports protection against phase failure
Manual/automatic reset provides flexible operation
Contactor mounting simplifies motor starter assembly
Screw terminals provide secure electrical connections
Compact S0 design helps save valuable panel space
Compatible with Siemens SIRIUS S0 contactors
Helps reduce motor downtime and maintenance requirements
Suitable for industrial automation and motor control applications
The Siemens 3RU2126-1DB00-8K is a thermal overload relay and motor protection relay designed to protect motors against excessive current and thermal overload conditions. It is designed for contactor mounting with compatible SIRIUS S0 contactors.
The Siemens 3RU2126-1DB00-8K has an adjustable overload current range of 2.2A to 3.2A, allowing the protection setting to be matched to the motor's rated operating current.
The 3RU2126-1DB00-8K uses a Class 10 thermal trip characteristic, making it suitable for standard motor starting conditions.
The 3RU2126-1DB00-8K has an S0 frame size and is designed for combination with compatible S0-size Siemens SIRIUS contactors.
Yes. This Siemens thermal overload relay supports manual/automatic reset, providing flexibility for different motor protection and control requirements.
The 3RU2126-1DB00-8K uses screw terminals for both the main circuit and auxiliary circuit, providing secure and conventional electrical connections.
The relay has a rated insulation voltage of 690V and surge voltage resistance of 6kV.
The 3RU2126-1DB00-8K is designed for S0-size contactor mounting and can be combined with compatible Siemens SIRIUS S0 contactors to create a complete motor starter assembly.
This Siemens motor protection relay can be used in DOL starters, pumps, compressors, conveyors, HVAC systems, industrial machinery, packaging equipment, OEM panels, and factory automation applications.
SB Smart, Faridabad supplies genuine Siemens industrial electrical and automation products, including SIRIUS thermal overload relays, motor protection relays, contactors, motor protection circuit breakers, and industrial control products, with competitive pricing, GST invoices, technical support, bulk-order assistance, secure packaging, and delivery across Faridabad, Delhi NCR, and India.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-1DB00-8K |
| SKU | 3RU2126-1DB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | DB008K |
| Current Setting Range | 2.2–3.2 A |
| Relay Size | S0 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Direct Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Rated Insulation Voltage | Up to 690 V AC |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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