Product Description

Siemens 3RB3026-2PB0 Electronic Overload Relay – 1–4 A, Class 20E

The Siemens 3RB3026-2PB0 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for reliable protection of three-phase motors against overload, phase failure and phase asymmetry. It provides an adjustable current range of 1 to 4 A, a Class 20E trip characteristic, Size S0 construction and contactor mounting.

The relay uses screw-terminal connections for the main and auxiliary circuits and supports manual and automatic reset, making it suitable for compact industrial motor starters, automation panels and OEM machinery.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3026-2PB0 belongs to the Siemens SIRIUS 3RB30 electronic overload relay family, designed for electronic monitoring and protection of industrial motors.

Its microprocessor-based electronic design continuously evaluates motor current and provides a defined overload response. The compact S0 contactor-mounted construction allows the relay to be integrated directly with compatible Siemens SIRIUS contactors.

Typical applications include:

• Small industrial motor control

• Pumps

• Fans and blowers

• Small compressors

• Conveyors

• Machine tools

• Production machinery

• Process equipment

• Industrial automation

• OEM control panels

Adjustable 1–4 A Current Range

The 3RB3026-2PB0 provides an adjustable current-setting range of 1 to 4 A. The device is suitable for protecting motors whose rated current falls within this adjustment range.

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

Class 20E Trip Characteristic

The exact 3RB3026-2PB0 is a Class 20E electronic overload relay.

The Class 20E characteristic provides a defined overload tripping response for motors with corresponding starting requirements. The selected trip characteristic should always be matched to the motor starting time and actual application conditions.

Electronic Overload Protection

The primary function of the 3RB3026-2PB0 is electronic motor-overload protection.

The relay continuously monitors motor current and responds when the configured overload characteristic is exceeded.

This helps protect compatible motors against:

• Prolonged overcurrent

• Excessive mechanical loading

• Motor overheating caused by overload

• Abnormal operating conditions

• Excessive starting duration

Correct adjustment of the current setting is essential for dependable motor protection.

Phase-Failure and Asymmetry Protection

The Siemens 3RB30 Class 20E family provides overload, phase-failure and asymmetry protection.

These functions are important for three-phase motors because phase loss or current imbalance can increase motor heating and electrical stress.

The relay therefore provides broader motor protection than overload protection alone.

1 NO + 1 NC Auxiliary Contacts

The 3RB3026-2PB0 provides 1 normally open (NO) and 1 normally closed (NC) auxiliary contact.

These auxiliary contacts can be incorporated into:

• Contactor-control circuits

• Trip indication

• PLC feedback

• Alarm signalling

• Motor fault monitoring

• Control-system interlocking

The auxiliary contacts provide a practical interface between the overload relay and the associated control system.

Contactor Mounting

The 3RB3026-2PB0 is designed for contactor mounting and belongs to Size S0.

This allows the overload relay to be integrated into a compact motor-starter assembly with a compatible Siemens SIRIUS contactor.

The exact compatible contactor should be verified against the complete Siemens product documentation before installation.

Screw-Terminal Connections

The 3RB3026-2PB0 uses screw-type terminals for the main current circuit and auxiliary/control circuit.

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

The auxiliary/control terminal configuration also supports practical servicing during commissioning and maintenance.

Manual and Automatic Reset

The 3RB3026-2PB0 supports manual and automatic RESET.

Manual reset can be selected when operator intervention is required after an overload trip, while automatic reset can be used where permitted by the complete machine and control-system design.

The reset method should always be selected with consideration for the motor, machine process and safety requirements.

TEST Function and Self-Monitoring

The Siemens 3RB30 Class 20E family includes diagnostic functions such as:

• TEST function

• Switch-position indication

• Self-monitoring

These functions can support:

• Commissioning

• Functional testing

• Troubleshooting

• Preventive maintenance

• Control-panel servicing

Electrical Characteristics

The 3RB3026-2PB0 is designed for industrial motor-control applications and uses the electrical characteristics specified for the Siemens 3RB30 S0 Class 20E range.

The device should be installed according to the specified voltage, current, conductor, short-circuit protection and environmental requirements for the complete motor-control system.

Compact S0 Design

The 3RB3026-2PB0 uses a compact S0-size housing suitable for motor starters and industrial control panels.

The compact construction helps integrate the overload relay into:

• Motor starters

• Automation cabinets

• Machine-control panels

• OEM electrical assemblies

• Industrial control systems

Industrial Motor-Control Applications

Small Pumps

The relay can protect compatible low-current pump motors against overload, phase failure and asymmetry.

Fans and Blowers

The Class 20E characteristic can be used for suitable motors with corresponding starting requirements.

Small Compressors

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

Conveyors

It can protect compatible conveyor motors against excessive mechanical loading and phase-related abnormalities.

Machine Tools

The compact S0 design is suitable for machine-control panels and motor-starter assemblies.

Process Automation

The relay can be integrated into automated systems for motor protection, trip signalling and contactor control.

Suitable for OEMs and Panel Builders

The 3RB3026-2PB0 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its combination of 1–4 A adjustable current range, Class 20E protection, S0 contactor mounting, 1 NO + 1 NC auxiliary contacts, screw terminals and manual/automatic reset makes it suitable for compact industrial motor-protection systems.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3026-2PB0

• Microprocessor-based electronic overload protection

• 1–4 A adjustable current range

• Class 20E

• Size S0

• Contactor mounting

• Screw terminals for main and auxiliary circuits

• 1 NO + 1 NC auxiliary contacts

• Overload protection

• Phase-failure protection

• Asymmetry protection

• Manual RESET

• Automatic RESET

• TEST function

• Self-monitoring

• Switch-position indication

• Suitable for compatible SIRIUS motor-starter assemblies

Benefits

• 1–4 A adjustable range: Suitable for low-current industrial motor applications.

• Class 20E: Provides a defined overload characteristic for compatible motor-starting requirements.

• Electronic monitoring: Provides continuous motor-current evaluation.

• Phase protection: Helps protect against phase failure and current asymmetry.

• 1 NO + 1 NC contacts: Provides control, signalling and trip-feedback paths.

• Contactor mounting: Supports compact S0 motor-starter assemblies.

• Screw terminals: Provides a familiar industrial wiring method.

• Manual/automatic reset: Supports different motor-control strategies.

• TEST and self-monitoring: Support commissioning and maintenance.

• Compact S0 design: Helps optimize motor-control-panel space.

Why Choose Siemens 3RB3026-2PB0?

The Siemens 3RB3026-2PB0 is a compact electronic overload relay for motor protection in the 1–4 A range with a Class 20E trip characteristic.

Its combination of electronic overload, phase-failure and asymmetry protection, S0 contactor mounting, 1 NO + 1 NC auxiliary contacts, screw connections and manual/automatic reset makes it suitable for small industrial motor starters, OEM machinery and automation panels.

For applications requiring reliable electronic motor protection in the low-current range, the 3RB3026-2PB0 provides a practical SIRIUS solution within compatible Siemens motor-control assemblies.

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 3RB3026-2PB0?

It is a Siemens SIRIUS 3RB3 electronic overload relay for motor protection with a 1–4 A adjustable current range and Class 20E characteristic.

2. What is the current setting range?

The adjustable current range is 1–4 A.

3. What is the trip class?

The exact 3RB3026-2PB0 is Class 20E.

4. Does it provide phase-failure protection?

Yes. The Siemens 3RB30 range provides phase-failure and asymmetry protection in addition to overload protection.

5. How many auxiliary contacts does it have?

It provides 1 NO + 1 NC auxiliary contacts.

6. Is it contactor-mounted?

Yes. The 3RB3026-2PB0 is designed for S0 contactor mounting.

7. Does it use screw terminals?

Yes. The product uses screw-type terminals for the main and auxiliary circuits.

8. What reset options are available?

It supports manual and automatic RESET.

9. Does it have diagnostic functions?

Yes. The 3RB30 Class 20E range includes TEST functionality, switch-position indication and self-monitoring.

10. Where can I buy Siemens 3RB3026-2PB0 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.