The Siemens 3RU2126-1CB0 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 1.8–2.5A and a Class 10 thermal trip characteristic, making it suitable for protecting motors against excessive current and thermal overload conditions.
The 3RU2126-1CB0 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. This Siemens motor overload relay is engineered for dependable operation in industrial motor starter and control applications.
With its adjustable 1.8–2.5A motor protection range, the relay allows the overload setting to be matched with the motor's rated operating current. It is suitable for DOL motor starters, pump control panels, compressor systems, conveyor systems, HVAC equipment, packaging machinery, machine tools, OEM control panels, water treatment systems, and industrial automation applications.
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: 3RU2126-1CB0
Adjustable Motor Overload Protection Range: 1.8–2.5A
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
Compatible with Siemens SIRIUS S0 Contactors
Reliable Motor Overload Protection
Compact Industrial Design
Suitable for Motor Starter and Automation Applications
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 1.8–2.5A range enables accurate motor protection
Class 10 characteristic is suitable for motors with normal starting conditions
Helps protect motors from damaging overload conditions
Manual/automatic reset provides flexible operation
Contactor mounting simplifies motor starter assembly
Screw terminals provide secure electrical connections
Compact S0 overload relay design helps optimize panel space
Compatible with Siemens SIRIUS S0 contactors
Helps reduce motor downtime and maintenance requirements
Suitable for industrial motor control and automation applications
The Siemens 3RU2126-1CB0 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 3RU2126-1CB0 has an adjustable overload current range of 1.8A to 2.5A, allowing the motor protection setting to be adjusted according to the motor's rated operating current.
The 3RU2126-1CB0 has a Class 10 thermal trip characteristic, making it suitable for motor applications with normal starting conditions.
The 3RU2126-1CB0 is an S0-size thermal overload relay designed for combination with compatible S0-size Siemens SIRIUS contactors.
Yes. The Siemens 3RU2126-1CB0 supports manual/automatic reset, providing flexibility for different motor control and protection applications.
The 3RU2126-1CB0 uses screw terminals for both the main circuit and auxiliary circuit, providing secure and conventional electrical connections.
The relay 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, pump systems, compressors, conveyors, HVAC equipment, packaging machinery, machine tools, OEM panels, and industrial automation systems.
The SIRIUS 3RU2 series provides reliable motor overload protection in compact motor starter assemblies. Its adjustable current range and Class 10 trip characteristic make it suitable for standard industrial motor protection 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 | 3RU2126-1CB0 |
| SKU | 3RU2126-1CB0 |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | CB0 |
| Current Setting Range | 1.8–2.5 A |
| Relay Size | S0 |
| Trip Class | Class 10 |
| Mounting Type | Direct Contactor Mounting |
| Operating Principle | Thermal |
| Main Circuit Connection | Screw Terminal |
| Auxiliary 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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