Product Description

Siemens SIRIUS Thermal Overload Relay S0 3.5–5A Class 10 – 3RU2126-1FB00-8K

Product Description

The Siemens 3RU2126-1FB00-8K is a reliable Thermal Overload Relay from the trusted SIRIUS 3RU2 series, designed to provide dependable overload protection for motors in industrial motor control and automation applications. With an adjustable current setting range of 3.5–5.0A, this Class 10 thermal overload relay helps protect motors against excessive current and thermal overload conditions, reducing the risk of motor damage and unplanned downtime. It features a compact S0 frame size, contactor mounting, screw terminal connections for the main and auxiliary circuits, and manual/automatic reset functionality.

The Siemens 3RU2126-1FB00-8K is designed to be combined with compatible SIRIUS S0 contactors, creating compact and dependable motor starter assemblies. Its adjustable overload setting allows the protection level to be matched with the motor's rated operating current. The relay is suitable for applications including DOL starters, pump control panels, compressors, conveyors, HVAC systems, machine tools, packaging machinery, OEM control panels, and factory automation. It has an insulation voltage rating of 690V, surge voltage resistance of 6kV, and a rated operating frequency of 50–60 Hz.

At SB Smart, Faridabad, we supply genuine Siemens SIRIUS overload relays, contactors, motor protection circuit breakers, soft starters, MCCBs, MCBs, and industrial automation products at competitive prices. We provide GST invoices, technical support, bulk order assistance, secure packaging, and delivery across Faridabad, Delhi NCR, and major cities throughout India.

Key Features

• Genuine Siemens SIRIUS 3RU2 Thermal Overload Relay

• Model: 3RU2126-1FB00-8K

• Adjustable Overload Current Range: 3.5–5.0A

• Frame Size: S0

• Class 10 Thermal Trip Characteristic

• 3-Pole Main Circuit

• Contactor Mounting

• Main Circuit: Screw Terminals

• Auxiliary Circuit: Screw Terminals

• Manual/Automatic Reset

• Compatible with SIRIUS S0 Contactors

• Rated Operating Voltage: 690V

• Operating Frequency: 50–60 Hz

• Insulation Voltage: 690V

• Surge Voltage Resistance: 6kV

• Total Typical Power Loss: 6.6W

• Compact Industrial Design

Applications

• Motor Control Centers (MCC)

• DOL Motor Starters

• Industrial Control Panels

• Pump Control Panels

• Compressor Systems

• Conveyor Systems

• HVAC Equipment

• Packaging Machinery

• Machine Tools

• Water Treatment Systems

• OEM Electrical Panels

• Factory Automation

Benefits

• Provides reliable thermal overload protection for motors

• Adjustable 3.5–5A range enables accurate motor protection

• Class 10 characteristic supports standard motor starting applications

• 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 minimize motor damage and unplanned downtime

• Suitable for demanding industrial applications

Frequently Asked Questions (FAQs)

Q1. What is Siemens 3RU2126-1FB00-8K used for?

The Siemens 3RU2126-1FB00-8K is a thermal overload relay designed to protect motors against excessive current and thermal overload conditions. It is intended for contactor mounting with compatible SIRIUS S0 contactors.

Q2. What is the overload setting range?

The relay has an adjustable overload current setting range of 3.5A to 5.0A, allowing the protection level to be adjusted according to the motor's rated operating current.

Q3. What does Class 10 mean in this overload relay?

Class 10 refers to the thermal trip characteristic of the overload relay and is commonly used for motors with normal starting conditions.

Q4. What is the frame size of this Siemens overload relay?

The 3RU2126-1FB00-8K has an S0 frame size and is designed to be combined with compatible S0-size SIRIUS contactors.

Q5. Does this overload relay support manual and automatic reset?

Yes. The 3RU2126-1FB00-8K provides manual/automatic reset functionality, offering flexibility for different motor control applications.

Q6. What type of terminals does it use?

This version uses screw terminals for both the main circuit and auxiliary circuit, providing secure and conventional wiring connections.

Q7. What is the operating voltage of the 3RU2126-1FB00-8K?

The relay has a rated operating voltage of up to 690V and a rated operating frequency of 50–60 Hz.

Q8. Why buy Siemens 3RU2126-1FB00-8K from SB Smart Faridabad?

SB Smart, Faridabad supplies genuine Siemens industrial products with competitive pricing, GST invoices, technical assistance, bulk-order support, secure packaging, and delivery across Faridabad, Delhi NCR, and India.