Product Description

Siemens 3RB3026-1VB0 Electronic Overload Relay – 10–40 A, Class 10E

The Siemens 3RB3026-1VB0 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for reliable motor protection in industrial automation and motor-control applications. It provides an adjustable current range of 10 to 40 A, a Class 10E trip characteristic, Size S0 construction and contactor mounting. Siemens specifies screw terminals for both the main and auxiliary circuits, together with manual and automatic reset. Siemens currently lists this article as an active product.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3026-1VB0 belongs to the Siemens SIRIUS 3RB electronic overload relay family, developed for electronic monitoring and protection of motors against overload and related abnormal operating conditions.

Its microprocessor-based electronic design continuously evaluates motor current and provides a defined Class 10E overload response. The compact S0 contactor-mounted design allows integration into compatible Siemens SIRIUS motor-starter assemblies.

Typical applications include:

• Industrial motor control

• Pumps

• Fans and blowers

• Compressors

• Conveyors

• Machine tools

• Production machinery

• Process equipment

• Industrial automation

• OEM control panels

Adjustable 10–40 A Current Range

The 3RB3026-1VB0 provides an adjustable current-setting range of 10 to 40 A, with a specified 40 A thermal current.

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.

Class 10E Trip Characteristic

The exact 3RB3026-1VB0 is a Class 10E electronic overload relay. Siemens identifies the product specifically as a Size S0, Class 10E, contactor-mounted electronic overload relay.

The Class 10E characteristic provides a defined overload tripping response for motors with corresponding starting requirements. The selected trip class should be matched to the motor starting time and actual application conditions.

Electronic Overload Protection

The primary function of the 3RB3026-1VB0 is electronic motor-overload protection.

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

This helps protect 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 important for dependable motor protection.

Phase-Failure and Asymmetry Protection

The Siemens 3RB30 electronic overload relay family provides overload, phase-failure and asymmetry protection. These functions help protect three-phase motors against abnormal current conditions that can cause additional motor heating and electrical stress.

Phase-failure protection is particularly important in three-phase motor applications because operation with a missing phase can produce unbalanced current and increased thermal stress.

1 NO + 1 NC Auxiliary Contacts

The 3RB30 overload relay range uses 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts for control, signalling and trip feedback. Independent product listings for the 3RB3026-1VB0 also identify a 1 NO / 1 NC configuration.

These 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 surrounding control system.

Contactor Mounting

The 3RB3026-1VB0 is designed for contactor mounting and belongs to Size S0. Siemens specifies S0 as the overload-relay size and the compatible contactor size.

This allows the relay to form a compact motor-starter assembly with a compatible Siemens SIRIUS contactor.

Typical applications include:

• Motor starters

• Industrial control panels

• Automation cabinets

• OEM machinery

• Process-control systems

Screw-Terminal Connections

The 3RB3026-1VB0 uses screw connections for both the main current circuit and auxiliary circuit. Siemens explicitly specifies screw connections for the main and auxiliary circuits.

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

Manual and Automatic Reset

The exact 3RB3026-1VB0 supports manual and automatic RESET. Siemens identifies the product with a Manual-Automatic-Reset configuration.

Manual reset can be selected where operator intervention is required following an overload trip, while automatic reset can be used where permitted by the overall control-system design.

The Siemens datasheet specifies a typical recovery time of approximately 3 minutes after an overload trip with automatic reset, while manual and remote reset recovery are specified as 0 minutes under the applicable conditions.

TEST Function and Self-Monitoring

The Siemens 3RB30 electronic overload relay family includes diagnostic features such as TEST functionality, switch-position indication and self-monitoring.

These functions can support:

• Commissioning

• Functional testing

• Troubleshooting

• Preventive maintenance

• Control-panel servicing

Electrical Characteristics

The 3RB3026-1VB0 has an insulation voltage of 690 V and a 6 kV surge-voltage resistance. Siemens specifies approximately 3 W total power loss at rated current in the hot operating state, or approximately 1 W per pole.

These electrical and thermal characteristics should be considered during motor-control-panel design and installation.

Compact S0 Design

The 3RB3026-1VB0 uses a compact S0 housing. The product data specifies a width of approximately 45 mm, making it suitable for compact motor-starter and control-panel assemblies.

Its compact construction is 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 against overload, phase failure and asymmetry.

Fans and Blowers

The Class 10E characteristic can be used for motors with corresponding starting requirements.

Compressors

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

Conveyors

The relay can protect compatible conveyor motors against excessive mechanical loading and abnormal phase conditions.

Machine Tools

Its 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 3RB3026-1VB0 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its combination of 10–40 A adjustable current range, Class 10E 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 3RB3026-1VB0

• Microprocessor-based electronic overload protection

• 10–40 A adjustable current range

• Class 10E

• 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

• 690 V insulation voltage

• 6 kV surge-voltage resistance

Benefits

• 10–40 A adjustable range: Suitable for a broad range of industrial motor currents.

• Class 10E: 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 construction: Helps optimize control-panel space.

Why Choose Siemens 3RB3026-1VB0?

The Siemens 3RB3026-1VB0 is a practical electronic overload relay for motor protection in the 10–40 A range with a Class 10E 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 industrial motor starters, OEM machinery and automation panels. Siemens currently lists the exact article as an active product.

The model is particularly suitable when a compact, contactor-mounted electronic overload relay is required for motors falling within the 10–40 A adjustment range.

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 3RB3026-1VB0?

It is a Siemens SIRIUS 3RB3 electronic overload relay for motor protection with a 10–40 A adjustable current range and Class 10E characteristic.

2. What is the current setting range?

The adjustable current range is 10–40 A.

3. What is the trip class?

The exact 3RB3026-1VB0 is Class 10E.

4. Does it provide phase-failure protection?

Yes. The Siemens 3RB30 family 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 3RB3026-1VB0 is designed for S0 contactor mounting.

7. Does it use screw terminals?

Yes. Siemens specifies screw connections for both 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 family includes TEST functionality, switch-position indication and self-monitoring.

10. Where can I buy Siemens 3RB3026-1VB0 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.