Product Description

Siemens 3RB3113-4SB0 Electronic Overload Relay – 3–12 A, Class 5E–30E

The Siemens 3RB3113-4SB0 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for reliable three-phase motor protection in industrial automation and motor-control systems. It provides an adjustable current-setting range of 3 to 12 A, selectable trip classes 5E, 10E, 20E and 30E, and S00 contactor mounting. Siemens' official Industry Mall identifies this exact article with screw connections for both the main and auxiliary circuits, manual/automatic reset and internal ground-fault detection.

The relay combines electronic overload protection with phase-failure and asymmetry protection, while the 3RB31 family also provides activatable internal ground-fault detection, electrical remote reset, TEST functionality, switch-position indication and self-monitoring.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3113-4SB0 belongs to the Siemens SIRIUS 3RB electronic overload relay family, designed to monitor motor current electronically and protect motors against overload and related abnormal operating conditions.

Its microprocessor-based design provides configurable trip characteristics and additional motor-protection functions compared with conventional thermal overload devices.

Typical applications include:

• Industrial motor control

• Pumps

• Fans and blowers

• Compressors

• Conveyors

• Machine tools

• Production machinery

• Process equipment

• Industrial automation

• OEM control panels

Adjustable 3–12 A Current Range

The 3RB3113-4SB0 provides an adjustable current range of 3 to 12 A. Siemens' current product listing confirms the exact range for this article.

This allows the relay to be adjusted according to the rated current of the protected motor.

The current setting should be selected according to the motor nameplate current and the requirements of the complete motor-protection system.

Selectable Class 5E–30E

The relay supports four selectable trip classes:

• Class 5E

• Class 10E

• Class 20E

• Class 30E

Siemens identifies these classes as adjustable within the 3RB31 electronic overload relay range.

This enables the overload protection characteristic to be matched to different motor starting times and load requirements.

Electronic Overload Protection

The primary function of the 3RB3113-4SB0 is electronic protection against motor overload.

The relay continuously monitors the motor current and responds when the measured condition exceeds the configured overload characteristic.

This can help protect motors against:

• Prolonged overcurrent

• Excessive mechanical loading

• Motor overheating caused by overload

• Abnormal operating conditions

• Inappropriate starting characteristics

Proper adjustment of the current setting and trip class is important for reliable motor protection.

Phase-Failure and Asymmetry Protection

The Siemens 3RB31 family provides phase-failure and asymmetry protection in addition to overload protection.

Phase-related abnormalities can produce unbalanced current and additional heating in three-phase motors. Electronic monitoring therefore provides broader motor protection than overload-only operation.

Internal Ground-Fault Detection

The 3RB3113-4SB0 includes internal ground-fault detection, which Siemens identifies as an activatable function of the product family.

This provides an additional protection function in suitable motor applications. The complete electrical protection scheme should always be designed according to the actual installation requirements.

Manual, Automatic and Remote Reset

The 3RB31 family supports flexible reset arrangements, including:

• Manual RESET

• Automatic RESET

• Integrated electrical remote RESET

These options allow the relay to be adapted to different motor-control and automation strategies.

TEST Function and Self-Monitoring

Siemens specifies the 3RB31 series with a TEST function, switch-position indication and self-monitoring.

These functions can support:

• Commissioning

• Troubleshooting

• Preventive maintenance

• Functional testing

• Control-panel servicing

1 NO + 1 NC Auxiliary Contacts

The 3RB3113-4SB0 provides 1 normally open (NO) and 1 normally closed (NC) auxiliary contact. Siemens technical data identifies one NC contact for contactor disconnection and one NO contact for the “tripped” indication.

These contacts can be incorporated into:

• Contactor-control circuits

• Trip indication

• PLC feedback

• Alarm circuits

• Motor fault monitoring

• Control-system interlocking

S00 Contactor Mounting

The 3RB3113-4SB0 is designed for contactor mounting in Size S00. Siemens identifies this exact article as a 3–12 A electronic overload relay with S00 contactor mounting.

This allows the relay to be integrated into compatible Siemens SIRIUS motor-starter assemblies, creating a compact motor-protection solution.

Screw-Terminal Connections

The 3RB3113-4SB0 uses screw connections for the main and auxiliary circuits. Siemens' product listing explicitly specifies screw connections for both circuits.

This provides a conventional wiring method for industrial panel builders and maintenance teams.

690 V Insulation Voltage

Siemens technical documentation specifies an insulation voltage of 690 V and a 6 kV surge-voltage resistance for the 3RB3113-4SB0.

These ratings should be considered together with the actual motor-control system, protective coordination and installation requirements.

Industrial Motor-Control Applications

The 3RB3113-4SB0 can be used in a variety of motor-protection applications.

Pumps

It can protect compatible pump motors against overload and phase-related operating conditions.

Fans and Blowers

Selectable trip classes allow the protection characteristic to be matched to the motor starting behaviour.

Compressors

Electronic overload monitoring can help protect compressor motors from excessive operating current.

Conveyors

The relay can protect conveyor motors against excessive mechanical loading and phase abnormalities.

Machine Tools

It can be integrated into motor-control systems used in industrial machinery.

Process Automation

Its electronic protection, reset functions and auxiliary signalling make it suitable for automated process equipment.

Suitable for OEMs and Panel Builders

The 3RB3113-4SB0 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its combination of 3–12 A adjustable current, Class 5E–30E selection, phase-failure and asymmetry protection, internal ground-fault detection and S00 contactor mounting makes it a practical solution for industrial motor protection.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3113-4SB0

• Microprocessor-based electronic overload protection

• 3–12 A adjustable current range

• Class 5E, 10E, 20E and 30E adjustable

• S00 size

• Contactor mounting

• Screw connections for main and auxiliary circuits

• 690 V insulation voltage

• Overload protection

• Phase-failure protection

• Phase-asymmetry protection

• Activatable internal ground-fault detection

• 1 NO + 1 NC auxiliary contacts

• Manual and automatic RESET

• Integrated electrical remote RESET

• TEST function

• Self-monitoring

• Switch-position indication

Benefits

• Microprocessor-based protection: Provides electronic motor-current monitoring and configurable protection.

• 3–12 A adjustable range: Suitable for motors within the specified current range.

• Class 5E–30E selection: Allows the trip characteristic to be matched to different motor-starting requirements.

• Phase protection: Helps detect phase failure and asymmetry.

• Ground-fault detection: Adds an additional protection function when activated.

• Flexible reset: Supports manual, automatic and remote-reset strategies.

• Diagnostic functions: TEST and self-monitoring assist commissioning and maintenance.

• Auxiliary signalling: 1 NO + 1 NC contacts provide control and trip-feedback functions.

• Contactor mounting: Supports compact SIRIUS motor-starter assemblies.

• Screw connections: Provides a familiar industrial wiring solution.

Why Choose Siemens 3RB3113-4SB0?

The Siemens 3RB3113-4SB0 is a compact electronic overload relay for motor protection in the 3–12 A range. Its selectable Class 5E, 10E, 20E and 30E trip characteristics allow the protection to be matched to different motor starting conditions.

The relay also combines overload protection with phase-failure and asymmetry protection and includes activatable internal ground-fault detection. Its S00 contactor mounting, 1 NO + 1 NC auxiliary contacts and screw-terminal connections make it suitable for integrated motor starters, automation panels and OEM machinery.

Delivery Across India

SB Smart supplies Siemens industrial electrical and automation products across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and major cities across India.

Major delivery locations include:

• Faridabad

• Gurgaon/Gurugram

• Delhi

• Delhi NCR

• Noida

• Greater Noida

• Haryana

• Punjab

• Mumbai

• Pune

• Ahmedabad

• Bengaluru

• Hyderabad

• Chennai

• Kolkata

• Jaipur

• Chandigarh

• Lucknow

• Indore

• Surat

• Vadodara

• Nagpur

• Coimbatore

• And other major cities across India

Frequently Asked Questions

1. What is Siemens 3RB3113-4SB0?

It is a Siemens SIRIUS 3RB3 microprocessor-based electronic overload relay for motor protection with a 3–12 A adjustable current range and Class 5E–30E selectable trip classes.

2. What is the current setting range?

The adjustable current range is 3–12 A.

3. Which trip classes are available?

The relay supports Class 5E, 10E, 20E and 30E.

4. Does it provide phase-failure protection?

Yes. The 3RB31 family provides phase-failure and asymmetry protection in addition to overload protection.

5. Does it have ground-fault detection?

Yes. The product provides internal ground-fault detection as an activatable function.

6. How many auxiliary contacts does it have?

It provides 1 NO + 1 NC auxiliary contacts. The NC contact is used for contactor disconnection and the NO contact for the “tripped” indication.

7. What reset options are available?

The 3RB31 family supports manual, automatic and integrated electrical remote RESET.

8. Is it contactor-mounted?

Yes. The 3RB3113-4SB0 is designed for S00 contactor mounting.

9. Does it use screw terminals?

Yes. Siemens specifies screw connections for both the main and auxiliary circuits.

10. Where can I buy Siemens 3RB3113-4SB0 in India?

You can explore the Siemens industrial electrical and automation product range at SB Smart for electronic overload relays, motor-protection devices, contactors and related control components.