Product Description

Siemens 3RB3046-2XW1 Electronic Overload Relay – 32–115 A, Class 20E

The Siemens 3RB3046-2XW1 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. The exact Siemens specification identifies this model with a 32–115 A adjustable current range, Class 20E, Size S3, stand-alone installation, a straight-through transformer in the main circuit, and screw terminals in the auxiliary circuit. It supports manual and automatic reset.

Important specification note: the exact article 3RB3046-2XW1 is a Class 20E overload relay, not Class 10E. Siemens' 2026 catalog and product datasheet both classify this article under 3RB30 electronic overload relays, Class 20E.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3046-2XW1 is part of the Siemens SIRIUS 3RB30 electronic overload relay range, developed for protecting motors against overload, phase failure and phase asymmetry.

The electronic design continuously evaluates motor current and provides a defined overload trip characteristic without relying on conventional bimetal elements.

Typical applications include:

• Industrial motor control

• Pumps

• Fans and blowers

• Compressors

• Conveyors

• Machine tools

• Production machinery

• Process equipment

• Industrial automation

• OEM motor-control panels

Adjustable 32–115 A Current Range

The 3RB3046-2XW1 has an adjustable current-response range of 32 to 115 A. Siemens specifies this range for the exact article.

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

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

Class 20E Trip Characteristic

The 3RB3046-2XW1 uses a Class 20E overload characteristic. Siemens lists the product specifically under the 3RB30 Class 20E range.

Class 20E provides a defined overload tripping characteristic suitable for motor applications with corresponding starting requirements.

When selecting an overload relay, the trip class should be matched to the motor's starting time and application conditions.

Electronic Overload Protection

The primary purpose of the 3RB3046-2XW1 is protection against motor overload.

The relay monitors the motor current electronically and trips when the measured operating condition exceeds the specified overload characteristic.

This helps protect motors against conditions such as:

• Prolonged overcurrent

• Excessive mechanical loading

• Motor overheating caused by overload

• Abnormal operating conditions

• Extended motor starting conditions when the selected trip class is unsuitable

Correct current adjustment is essential for effective motor protection.

Phase-Failure and Asymmetry Protection

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

Phase failure or severe current imbalance can increase motor heating and may result in motor damage if protection is not provided.

The 3RB3046-2XW1 therefore offers broader motor protection than an overload-only device.

1 NO + 1 NC Auxiliary Contacts

The Siemens 3RB30 range provides 1 normally open (NO) and 1 normally closed (NC) auxiliary contact.

These contacts can be integrated into the motor-control circuit for functions such as:

• Contactor control

• Trip indication

• PLC feedback

• Alarm signalling

• Motor fault monitoring

• Control-system interlocking

This allows the overload relay's operating state to be communicated to other control components.

Stand-Alone Installation

The 3RB3046-2XW1 is specifically designed for stand-alone installation.

Siemens specifies a straight-through transformer in the main circuit, while the auxiliary circuit uses screw terminals. The product is a Size S3 overload relay and can be used with compatible S3 contactor systems where applicable.

This configuration provides flexibility when the overload relay needs to be installed separately from the contactor.

Screw-Terminal Auxiliary Connection

The 3RB3046-2XW1 uses screw terminals for the auxiliary circuit. Siemens identifies screw-terminal and spring-loaded versions separately within the 3RB30 range.

The screw-terminal configuration provides a conventional wiring method for industrial panel builders and maintenance teams.

Compact S3 Design

The 3RB3046-2XW1 is a Size S3 electronic overload relay. Siemens specifies the device for S3 contactor size applications and gives a main-circuit insulation voltage of 1,000 V with 8 kV surge-voltage resistance.

The S3 format is suitable for larger motor-control assemblies and industrial control panels.

Thermal and Installation Considerations

The product datasheet specifies approximately 0.6 W total power loss at rated current in the hot operating state, with approximately 0.2 W per pole.

The relay is specified for operation between -25 °C and +60 °C, with appropriate temperature compensation.

Actual installation should follow Siemens' thermal, wiring and mounting requirements.

Manual and Automatic Reset

The 3RB3046-2XW1 supports manual and automatic RESET. Siemens identifies these reset modes for the 3RB30 Class 20E range.

This provides flexibility for motor-control systems where either operator intervention or an appropriately designed automatic reset strategy is required.

TEST Function and Self-Monitoring

The Siemens 3RB30 range includes a TEST function, switch-position indication and self-monitoring.

These functions can assist with:

• Commissioning

• Functional testing

• Troubleshooting

• Preventive maintenance

• Control-panel servicing

Industrial Motor-Control Applications

Pumps

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

Fans and Blowers

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

Compressors

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

Conveyors

It can be used to protect conveyor motors against excessive mechanical loading and phase-related abnormalities.

Production Machinery

The S3-size construction is suitable for larger industrial motor-control assemblies.

Process Automation

Its protection and auxiliary signalling functions make it suitable for automated industrial process equipment.

Suitable for OEMs and Panel Builders

The 3RB3046-2XW1 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its combination of 32–115 A adjustable current, Class 20E protection, phase-failure and asymmetry protection, S3 construction, stand-alone installation and screw-terminal auxiliary connections makes it suitable for larger industrial motor-protection systems.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3046-2XW1

• Microprocessor-based electronic overload protection

• 32–115 A adjustable current range

• Class 20E

• Size S3

• Stand-alone installation

• Straight-through transformer in main circuit

• Screw terminals in auxiliary circuit

• Overload protection

• Phase-failure protection

• Asymmetry protection

• 1 NO + 1 NC auxiliary contacts

• Manual and automatic RESET

• TEST function

• Self-monitoring

• Switch-position indication

• 1,000 V insulation voltage

• 8 kV surge-voltage resistance

Benefits

• 32–115 A adjustable range: Suitable for a broad range of industrial motor currents.

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

• Electronic protection: Provides continuous current monitoring without a conventional bimetal element.

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

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

• Stand-alone installation: Gives flexibility in motor-control-panel layouts.

• Screw terminals: Provides a familiar industrial wiring solution.

• Diagnostic functions: TEST and self-monitoring support commissioning and maintenance.

• S3 construction: Suitable for larger SIRIUS motor-control assemblies.

Why Choose Siemens 3RB3046-2XW1?

The Siemens 3RB3046-2XW1 is a robust electronic overload relay for industrial motor protection in the 32–115 A range. Its Class 20E characteristic, overload protection, phase-failure protection and asymmetry protection make it suitable for a wide range of industrial motors.

The stand-alone design with a straight-through transformer, S3 construction, 1 NO + 1 NC auxiliary contacts, manual/automatic reset and diagnostic functions provide flexibility for OEM panels, industrial motor-control systems and automation installations.

For procurement, it is important to note that 3RB3046-2XW1 is a Class 20E model; it should not be described as Class 10E unless the article number is changed to the appropriate Class 10E variant. Siemens' current catalog confirms this distinction.

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 3RB3046-2XW1?

It is a Siemens SIRIUS 3RB3 electronic overload relay for motor protection with a 32–115 A adjustable current range and Class 20E characteristic.

2. Is the 3RB3046-2XW1 a Class 10E relay?

No. The exact 3RB3046-2XW1 is Class 20E according to Siemens' product datasheet and current catalog.

3. What is the current setting range?

The adjustable current range is 32–115 A.

4. What type of overload protection does it provide?

It provides electronic overload, phase-failure and asymmetry protection.

5. How many auxiliary contacts does it have?

The 3RB30 Class 20E range provides 1 NO + 1 NC auxiliary contacts.

6. Is it designed for stand-alone installation?

Yes. The 3RB3046-2XW1 is a stand-alone S3 overload relay with a straight-through transformer in the main circuit.

7. What type of auxiliary terminals does it use?

It uses screw terminals for the auxiliary circuit.

8. What reset options are available?

It supports manual and automatic RESET.

9. Does it have diagnostic functions?

Yes. Siemens specifies a TEST function, switch-position indication and self-monitoring for the 3RB30 Class 20E range.

10. Where can I buy Siemens 3RB3046-2XW1 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.