Product Description

Siemens 3RB3026-1PB0 Electronic Overload Relay – 1–4 A, Class 10E

The Siemens 3RB3026-1PB0 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for motor protection against overload, phase failure and asymmetry. It provides an adjustable current range of 1 to 4 A, a Class 10E trip characteristic, Size S0 construction and contactor mounting. Siemens specifies screw terminals for both the main and auxiliary circuits and a manual/automatic reset function.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3026-1PB0 is designed for electronic monitoring and protection of motors in industrial electrical installations. Its microprocessor-based electronic design evaluates motor current and provides a defined Class 10E overload response.

The compact S0 contactor-mounted design allows the relay to be combined with compatible Siemens SIRIUS contactors in motor-starter assemblies.

Typical applications include:

• Small industrial motors

• Pumps

• Fans and blowers

• Small compressors

• Conveyors

• Machine tools

• Production equipment

• Process machinery

• Motor starters

• Industrial control panels

Adjustable 1–4 A Current Range

The 3RB3026-1PB0 has an adjustable current-response range of 1 to 4 A and a rated/thermal current of 4 A. Siemens also gives guide motor-power ranges of 0.37–1.5 kW at 400 V, 0.37–2.2 kW at 500 V, and 0.55–3 kW at 690 V for three-phase motor applications.

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

Class 10E Trip Characteristic

The exact 3RB3026-1PB0 is a Class 10E electronic overload relay. Siemens' official datasheet identifies the trip class as CLASS 10E.

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

Electronic Overload Protection

The primary function of the 3RB3026-1PB0 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 current adjustment is essential for dependable motor protection.

Phase-Failure and Asymmetry Protection

The Siemens 3RB30 Class 10E range provides overload, phase-failure and asymmetry protection. Siemens lists these as core protection functions of the 3RB30 electronic overload-relay family.

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

1 NO + 1 NC Auxiliary Contacts

The 3RB3026-1PB0 has 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 used for:

• Contactor-control circuits

• Trip indication

• Control-panel feedback

• Alarm signalling

• Motor fault indication

• Electrical interlocking

The Siemens specification gives auxiliary-contact ratings up to 4 A at 24–125 V AC-15 and 3 A at 230 V AC-15; DC-13 ratings vary with voltage.

Contactor Mounting

The 3RB3026-1PB0 is designed for contactor mounting and belongs to Size S0. Siemens specifies approximate dimensions of 87 mm height, 45 mm width and 84 mm depth.

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

Screw-Terminal Connections

The 3RB3026-1PB0 uses screw-type terminals for both the main current circuit and auxiliary/control circuit. The auxiliary/control terminal is removable.

This provides a conventional connection method for electrical panels, motor starters and maintenance applications.

Manual and Automatic Reset

The exact 3RB3026-1PB0 supports manual and automatic RESET. Siemens lists the product as Manual-Automatic-Reset.

Siemens specifies a typical recovery time of approximately 3 minutes after an overload trip with automatic reset, while manual and remote reset conditions have a typical recovery time of 0 minutes.

The appropriate reset mode should be selected according to the motor and machine-control requirements.

TEST Function and Self-Monitoring

The Siemens 3RB30 Class 10E range includes TEST functionality, switch-position indication and self-monitoring.

These features can assist with:

• Commissioning

• Functional testing

• Troubleshooting

• Preventive maintenance

• Panel servicing

Electrical Characteristics

The 3RB3026-1PB0 has an insulation voltage of 690 V and a 6 kV surge-voltage resistance. Siemens specifies approximately 0.1 W total power loss at rated current in the hot operating state, or approximately 0.03 W per pole.

The device is designed for 50–60 Hz operation and an installation altitude of up to 2,000 m under the specified conditions.

Industrial Motor Applications

Small Pumps

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

Fans and Blowers

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

Small Compressors

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

Conveyors

The relay can be incorporated into motor starters for compatible low-current conveyor applications.

Machine Tools

Its compact S0 construction is suitable for machine-control panels and motor-starter assemblies.

Production Equipment

The relay can be used for motor protection in suitable manufacturing and production machinery.

Suitable for OEMs, Panel Builders and Electrical Dealers

The 3RB3026-1PB0 is suitable for OEM equipment manufacturers, electrical panel builders, industrial maintenance teams, industrial buyers and electrical product dealers.

For customers purchasing through SB Smart, the product is positioned for industrial electrical product supply and procurement rather than automation integration or automation-service work.

SB Smart can supply Siemens industrial electrical components for requirements across Faridabad, Delhi NCR, Gurgaon/Gurugram, Noida, Haryana, Punjab, Mumbai and other major Indian cities.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3026-1PB0

• Microprocessor-based electronic overload protection

• 1–4 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

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

• Class 10E: Provides a defined overload characteristic for suitable motor-starting requirements.

• Electronic protection: Provides continuous motor-current monitoring.

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

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

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

• Screw terminals: Provides a familiar industrial wiring solution.

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

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

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

Why Choose Siemens 3RB3026-1PB0?

The Siemens 3RB3026-1PB0 is a compact electronic overload relay for motor protection in the 1–4 A range with a Class 10E trip characteristic.

Its combination of electronic overload protection, 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, electrical panels and replacement requirements. Siemens' current Industry Mall lists the product as available for sale.

For SB Smart, this product is best positioned around Siemens industrial electrical product supply, dealer/distributor procurement and nationwide industrial component sourcing, without claiming automation integration services.

Delivery Across India

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

Major delivery locations include:

• Faridabad

• Delhi

• Gurgaon/Gurugram

• 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 3RB3026-1PB0?

It is a Siemens SIRIUS 3RB3 electronic overload relay for motor protection with a 1–4 A adjustable current range and Class 10E characteristic.

2. What is the current setting range?

The adjustable current range is 1–4 A.

3. What is the trip class?

The exact 3RB3026-1PB0 is Class 10E.

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. The NC contact is used for contactor disconnection and the NO contact for the “tripped” indication.

6. Is it contactor-mounted?

Yes. The 3RB3026-1PB0 is designed for S0 contactor mounting.

7. Does it use screw terminals?

Yes. Siemens specifies screw-type terminals 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 range includes TEST functionality, switch-position indication and self-monitoring.

10. Where can I buy Siemens 3RB3026-1PB0 in India?

SB Smart supplies Siemens industrial electrical products in India, including SIRIUS electronic overload relays and related motor-protection components for industrial buyers, panel builders, maintenance requirements and product procurement.