The Siemens 3RU2126-1EB0 is a high-quality Siemens SIRIUS Thermal Overload Relay designed for reliable motor overload protection in industrial electrical systems, motor control panels, automation applications, and motor starter assemblies. Part of the proven SIRIUS 3RU2 series, this motor protection relay features an adjustable overload current range of 2.8–4.0A and a Class 10 thermal trip characteristic, making it suitable for protecting motors under normal starting conditions. Siemens specifies the 3RU2 series for inverse-time delayed protection of electrical loads such as motors.
The 3RU2126-1EB0 overload relay is designed for S0-size contactor mounting and provides dependable protection against motor overload and phase failure conditions. It features a 3-pole main circuit, screw terminals for both the main and auxiliary circuits, and manual/automatic reset functionality. With a rated insulation voltage of 690V, surge voltage resistance of 6kV, and operating frequency of 50–60 Hz, it is engineered for reliable use in demanding industrial environments.
This Siemens motor overload relay can be integrated with compatible SIRIUS S0 contactors to create compact and reliable motor starter solutions. It is suitable for DOL motor starters, pump control panels, compressor systems, conveyor machines, HVAC equipment, industrial automation panels, packaging machinery, machine tools, OEM control panels, and factory automation systems. The adjustable 2.8–4A current setting enables the overload protection to be matched to the motor's rated current for effective and dependable operation.
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: 3RU2126-1EB0
Adjustable Motor Overload Protection Range: 2.8–4.0A
Class 10 Thermal Trip Characteristic
S0 Frame Size
Designed for Contactor Mounting
3-Pole Main Circuit
Main Circuit: Screw Terminals
Auxiliary Circuit: Screw Terminals
Manual/Automatic Reset
Rated Operating Voltage: 690V
Operating Frequency: 50–60 Hz
Insulation Voltage: 690V
Surge Voltage Resistance: 6kV
Compatible with SIRIUS S0 Contactors
Compact Design for Industrial Motor Starters
Reliable Motor Overload and Phase Failure Protection
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 2.8–4A range enables accurate motor protection
Class 10 characteristic is suitable for motors with normal starting conditions
Helps protect motors from damaging overload conditions
Provides phase failure protection
Manual/automatic reset offers flexible operation
Contactor mounting simplifies motor starter assembly
Screw terminals provide secure electrical connections
Compact S0 design helps optimize control-panel space
Compatible with Siemens SIRIUS S0 contactors
Helps reduce motor downtime and maintenance requirements
Suitable for industrial automation and continuous-duty applications
The Siemens 3RU2126-1EB0 is a thermal overload relay and motor protection relay used to protect motors against overload and phase failure conditions. It is designed for mounting with compatible SIRIUS S0 contactors.
The Siemens 3RU2126-1EB0 has an adjustable overload current range of 2.8A to 4.0A, allowing the motor protection setting to be adjusted according to the motor's rated operating current.
The 3RU2126-1EB0 has a Class 10 thermal trip characteristic, which is intended for motor applications with normal starting conditions. Siemens identifies Class 10/10A as suitable for normal motor starting conditions.
The 3RU2126-1EB0 is an S0-size thermal overload relay and can be combined with compatible S0-size SIRIUS contactors.
Yes. The SIRIUS 3RU2 thermal overload relay series provides overload and phase failure protection, helping protect motors from abnormal operating conditions.
The 3RU2126-1EB0 uses screw terminals for both the main circuit and auxiliary circuit, providing a conventional and secure connection method.
The relay has a rated operating voltage of 690V and a rated operating frequency of 50–60 Hz.
Yes. The 3RU2126-1EB0 supports manual and automatic reset, providing flexibility according to the requirements of the motor control application.
The 3RU2126-1EB0 is designed for S0-size contactor mounting and can be integrated with compatible Siemens SIRIUS S0 contactors to build a complete motor starter assembly.
SB Smart, Faridabad supplies genuine Siemens industrial electrical and automation products, including SIRIUS 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 | 3RU2126-1EB0 |
| SKU | 3RU2126-1EB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | EB0 |
| 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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