Product Description

Siemens 3RB3113-4TB0 Electronic Overload Relay – 4–16 A, Class 5E–30E

The Siemens 3RB3113-4TB0 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for reliable protection of three-phase motors in industrial automation and motor-control applications. It provides an adjustable current range of 4 to 16 A, selectable trip classes 5E, 10E, 20E and 30E, and is designed for direct contactor mounting in Size S00. Siemens specifies overload, phase-failure and asymmetry protection, with activatable internal ground-fault detection.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3113-4TB0 belongs to Siemens' SIRIUS 3RB electronic overload relay family, providing electronic motor-current monitoring and configurable protection characteristics.

Unlike conventional thermal overload relays, the microprocessor-based design provides adjustable trip classes and additional protection functions for industrial motor applications.

Typical applications include:

• Industrial motor control

• Pumps

• Fans and blowers

• Compressors

• Conveyors

• Machine tools

• Production machinery

• Process equipment

• Industrial automation

• OEM control panels

Adjustable 4–16 A Current Range

The 3RB3113-4TB0 provides an adjustable current setting range of 4–16 A. Siemens' product data specifies 4–16 A as the adjustable pickup range, with a rated operational current of up to 16 A.

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

The current setting should be selected using 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 features of the 3RB31 electronic overload relay range.

This flexibility allows the protection characteristic to be matched to different motor starting times and load characteristics.

Electronic Overload Protection

The main function of the 3RB3113-4TB0 is electronic protection against motor overload.

The relay continuously monitors motor current and trips when the measured condition exceeds the configured protection characteristics.

This can help protect motors against:

• Prolonged overcurrent

• Excessive mechanical loading

• Motor overheating caused by overload

• Abnormal operating conditions

• Unsuitable motor-starting conditions

Correct current and trip-class settings are 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 abnormalities can produce unbalanced currents and additional heating in three-phase motors. Electronic monitoring therefore provides broader motor protection than overload-only operation.

Internal Ground-Fault Detection

The 3RB3113-4TB0 belongs to the 3RB31 range that provides activatable internal ground-fault detection.

This provides an additional monitoring function for suitable motor-protection applications. The complete protection scheme should always be selected and designed according to the electrical requirements of the installation.

Manual, Automatic and Remote Reset

The 3RB31 family supports:

• Manual RESET

• Automatic RESET

• Integrated electrical remote RESET

These functions provide flexibility for different motor-control and automation strategies.

Manual reset can be used where operator intervention is required after a trip, while automatic or remote reset can be incorporated into appropriately designed control systems.

TEST Function and Self-Monitoring

The 3RB31 range includes 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 3RB3113-4TB0 provides 1 normally open (NO) and 1 normally closed (NC) auxiliary contact.

Siemens specifies the NC contact for contactor disconnection and the 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

Direct Contactor Mounting

The 3RB3113-4TB0 is designed for direct mounting on a compatible SIRIUS contactor and belongs to the compact S00 size. Siemens' product documentation lists this model in the S00 range and identifies it as suitable for direct mounting on compatible contactors.

This allows the overload relay to form part of a compact motor-starter assembly.

Screw-Terminal Connections

The 3RB3113-4TB0 uses screw terminals for the main and auxiliary circuits. Siemens states that S00/S0 3RB31 devices are available with screw or spring-loaded terminals, and the 4TB0 variant is the screw-terminal version.

This provides a familiar wiring method for electrical panel builders and maintenance teams.

690 V Main-Circuit Rating

The exact datasheet specifies a 690 V rated operational voltage and 50–60 Hz operating frequency for the main circuit. The rated operating current is 16 A.

These ratings should be considered together with the motor application, protective coordination, conductor sizing and installation conditions.

Industrial Motor-Control Applications

The 3RB3113-4TB0 is suitable for a wide range of motor-protection applications.

Pumps

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

Fans and Blowers

The adjustable trip class can be selected according to the motor's starting characteristics.

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 assemblies for production and machine-tool applications.

Process Automation

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

Suitable for OEMs and Panel Builders

The 3RB3113-4TB0 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its combination of 4–16 A adjustable current, Class 5E–30E selection, overload protection, phase-failure and asymmetry protection, internal ground-fault detection and direct contactor mounting makes it a practical solution for industrial motor protection.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3113-4TB0

• Microprocessor-based electronic overload protection

• 4–16 A adjustable current range

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

• Size S00

• Contactor mounting

• Screw terminals

• 690 V rated operational 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 evaluation and configurable protection.

• 4–16 A adjustable range: Suitable for motors within the specified current range.

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

• Phase protection: Helps protect against 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 useful control and trip-feedback functions.

• Contactor mounting: Enables a compact motor-starter assembly.

• Screw connections: Provides a familiar industrial wiring solution.

Why Choose Siemens 3RB3113-4TB0?

The Siemens 3RB3113-4TB0 is a compact electronic overload relay for motor protection in the 4–16 A range.

Its Class 5E, 10E, 20E and 30E selectable trip characteristics allow the device to be adapted to different motor starting conditions, while phase-failure and asymmetry protection provide additional monitoring. The 3RB31 family also includes activatable internal ground-fault detection, flexible reset functions, TEST functionality and self-monitoring.

With S00 contactor mounting, 1 NO + 1 NC auxiliary contacts and screw terminals, it is suitable for compact industrial motor starters, OEM machinery and automation panels.

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 3RB3113-4TB0?

It is a Siemens SIRIUS 3RB3 microprocessor-based electronic overload relay for motor protection with a 4–16 A adjustable current range and Class 5E–30E selectable trip classes.

2. What is the current setting range?

The adjustable current range is 4–16 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. Internal ground-fault detection is available 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" message.

7. What reset options are available?

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

8. Is it contactor-mounted?

Yes. The 3RB3113-4TB0 is a Size S00 relay designed for contactor mounting.

9. Does it use screw terminals?

Yes. The 4TB0 version uses screw-terminal connections.

10. Where can I buy Siemens 3RB3113-4TB0 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.