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 protection of three-phase motors 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 identifies the exact article as an electronic overload relay for motor protection with screw terminals for both the main and auxiliary circuits, manual/automatic reset and internal ground-fault detection.

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 electronic design provides configurable trip characteristics and additional protection functions compared with conventional thermal overload relays.

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-setting range of 3 to 12 A. Siemens specifies this exact range for the product.

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

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 Class 5E, 10E, 20E and 30E as adjustable trip classes for the 3RB31 electronic overload relay family.

This flexibility allows the overload protection characteristic to be matched to different motor starting times and application requirements.

Electronic Overload Protection

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

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

This can help protect motors against:

• Prolonged overcurrent

• Excessive mechanical loading

• Motor overheating caused by overload

• Abnormal operating conditions

• Improperly selected starting characteristics

Correct current adjustment and trip-class selection are important for reliable motor protection.

Phase-Failure and Asymmetry Protection

The Siemens 3RB31 family provides overload, phase-failure and phase-asymmetry protection.

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

This makes the relay suitable for industrial three-phase motor-control systems where phase-related protection is required.

Internal Ground-Fault Detection

The 3RB3113-4SB0 includes internal ground-fault detection, which is an activatable protection function in the 3RB31 family. Siemens lists internal ground-fault detection among the standard features of this range.

This provides an additional monitoring function in suitable motor-protection applications.

The complete electrical protection arrangement should always be selected according to the requirements of the installation.

Manual, Automatic and Remote Reset

The 3RB31 family provides flexible reset options, including:

• Manual RESET

• Automatic RESET

• Integrated electrical remote RESET at 24 V DC

Siemens specifies approximately 3 minutes recovery after an automatic reset, while manual and remote reset can recover immediately under the specified conditions.

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

TEST Function and Self-Monitoring

The 3RB31 family includes a TEST function, switch-position indication and self-monitoring.

These functions can assist with:

• Commissioning

• Troubleshooting

• Preventive maintenance

• Functional testing

• Control-panel servicing

The switch-position indicator also provides a convenient visual indication of the relay's operating state.

1 NO + 1 NC Auxiliary Contacts

The 3RB3113-4SB0 provides 1 normally closed (NC) and 1 normally open (NO) auxiliary contact. Siemens specifies the NC contact for contactor disconnection and the NO contact for the “tripped” message.

These contacts can be incorporated into:

• Contactor-control circuits

• Trip indication

• PLC feedback

• Alarm circuits

• Motor fault monitoring

• Control-system interlocking

This allows the overload relay to communicate its operating or trip condition to the surrounding control system.

S00 Contactor Mounting

The 3RB3113-4SB0 is designed for contactor mounting in Size S00. Siemens identifies the exact article as a Size S00, Class 5–30 electronic overload relay for contactor mounting.

This enables the overload relay to be integrated with compatible SIRIUS contactors to create a compact motor-starter assembly.

Screw-Terminal Connections

The 3RB3113-4SB0 uses screw-type terminals for both the main and auxiliary circuits.

The auxiliary/control terminal is removable, supporting practical wiring and servicing in industrial control panels.

690 V Rated Operational Voltage

Siemens specifies a 690 V maximum rated operational voltage for the main circuit and 50–60 Hz rated operating frequency. The device has a rated operational current of 12 A.

The applicable motor power range includes approximately 1.5–5.5 kW at 400 V, depending on the motor and application.

Compact S00 Design

The relay has a compact S00 housing with approximate dimensions of 79 mm height × 45 mm width × 73 mm depth.

This makes it suitable for:

• Motor starters

• Automation cabinets

• Machine-control panels

• OEM electrical assemblies

• Industrial control systems

Industrial Motor-Control Applications

Pumps

The relay can protect compatible pump motors from overload, phase failure and phase asymmetry.

Fans and Blowers

The selectable trip classes allow protection characteristics to be matched to different motor starting conditions.

Compressors

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

Conveyors

It can be used in conveyor motor-control systems where overload and phase-related protection are required.

Machine Tools

The compact S00 design is suitable for motor-control assemblies in industrial machinery.

Process Automation

The combination of electronic protection, reset functions and auxiliary signalling makes the relay 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, overload/phase protection, internal ground-fault detection, flexible reset functions and S00 contactor mounting makes it a practical motor-protection solution.

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 terminals for main and auxiliary circuits

• 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 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 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 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 combines overload, phase-failure and asymmetry protection with activatable internal ground-fault detection. It also provides flexible reset functions, a TEST function, self-monitoring and integrated 1 NO + 1 NC auxiliary contacts.

With S00 contactor mounting and screw terminals, it is suitable for compact industrial 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 setting 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 phase-asymmetry protection in addition to overload protection.

5. Does it have ground-fault detection?

Yes. It provides activatable internal ground-fault detection.

6. How many auxiliary contacts does it have?

It provides 1 NO + 1 NC auxiliary contacts. The NC contact is specified 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 3RB3113-4SB0 is designed for S00 contactor mounting.

9. Does it use screw terminals?

Yes. It uses screw terminals 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.