Product Description

Siemens 3RB3046-1XW1 Electronic Overload Relay – 32–115 A, Class 10E

The Siemens 3RB3046-1XW1 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 32 to 115 A, a Class 10E trip characteristic, Size S3 construction, and stand-alone installation with a straight-through transformer in the main circuit and screw terminals for the auxiliary circuit. Siemens currently lists this article as an active product.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3046-1XW1 belongs to the Siemens SIRIUS 3RB30 electronic overload relay family, designed to protect motors against overload, phase failure and asymmetry.

Its electronic, microprocessor-based design continuously evaluates motor current and provides a defined overload response, making it suitable for industrial motor-control systems where reliable protection and adjustable current settings are required.

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 3RB3046-1XW1 provides an adjustable current-setting range of 32 to 115 A. Siemens identifies 115 A as the thermal current for the device.

This broad adjustment range allows the relay to be configured for motors with different rated currents within the specified range.

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

Class 10E Trip Characteristic

The exact 3RB3046-1XW1 is a Class 10E electronic overload relay. Siemens' current product description and 2025/2026 catalogs explicitly identify this article as Class 10E.

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

Electronic Overload Protection

The primary function of the 3RB3046-1XW1 is electronic motor-overload protection.

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

This helps protect motors against conditions such as:

• Prolonged overcurrent

• Excessive mechanical loading

• Motor overheating caused by overload

• Abnormal operating conditions

• Inappropriate motor-starting conditions

Proper adjustment of the current setting is essential for effective motor protection.

Phase-Failure and Asymmetry Protection

The Siemens 3RB30 Class 10E range provides overload, phase-failure and asymmetry protection.

Phase failure or significant current imbalance can cause increased motor heating and operating stress. Electronic monitoring therefore provides broader protection for three-phase motors than overload protection alone.

1 NO + 1 NC Auxiliary Contacts

The Siemens 3RB30 Class 10E range provides 1 normally open (NO) and 1 normally closed (NC) auxiliary contact.

These contacts can be incorporated into motor-control and automation circuits for:

• Contactor control

• Trip indication

• PLC feedback

• Alarm signalling

• Motor fault monitoring

• Control-system interlocking

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

Stand-Alone Installation

The 3RB3046-1XW1 is specifically designed for stand-alone installation. Siemens specifies a straight-through transformer in the main circuit and a screw connection for the auxiliary circuit.

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

The device is designed for Size S3 applications.

Screw-Terminal Auxiliary Connection

The 3RB3046-1XW1 uses a screw-terminal auxiliary circuit. Siemens distinguishes this configuration from spring-loaded-terminal versions in the 3RB30 range.

This provides a conventional wiring method for industrial electrical panels, making the device practical for panel builders and maintenance teams.

Manual and Automatic Reset

The exact 3RB3046-1XW1 supports manual and automatic RESET. Siemens specifies these reset modes in the current Industry Mall product description.

The typical recovery time after an overload trip is approximately 3 minutes with automatic reset, while manual and remote reset conditions can provide immediate reset when the specified conditions are met.

The appropriate reset strategy should be selected according to the machine-control requirements.

TEST Function and Self-Monitoring

Siemens specifies the 3RB30 Class 10E family with:

• TEST function

• Switch-position indication

• Self-monitoring

• Optional sealable covers

These functions support commissioning, troubleshooting and preventive maintenance.

Electrical and Environmental Characteristics

The 3RB3046-1XW1 has an insulation voltage of 1,000 V and a specified surge-voltage resistance of 8 kV. Siemens specifies approximately 0.6 W total power loss at rated current in the hot operating state.

The operating ambient temperature range is -25 °C to +60 °C, subject to the applicable temperature-compensation conditions.

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

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 selected for motors with corresponding starting requirements.

Compressors

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

Conveyors

The device can protect conveyor motors against excessive mechanical loading and phase-related abnormalities.

Production Machinery

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

Process Automation

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

Suitable for OEMs and Panel Builders

The 3RB3046-1XW1 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its combination of 32–115 A adjustable current range, Class 10E protection, phase-failure and asymmetry protection, S3 construction, stand-alone installation, screw-terminal auxiliary connections and flexible reset options makes it suitable for industrial motor-protection systems.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3046-1XW1

• Microprocessor-based electronic overload protection

• 32–115 A adjustable current range

• Class 10E

• 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 10E protection: Provides a defined overload characteristic for suitable motor-starting conditions.

• Electronic monitoring: Provides accurate current evaluation without conventional thermal bimetal operation.

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

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

• Stand-alone installation: Provides flexibility for motor-control-panel layouts.

• Screw terminals: Offers a familiar industrial wiring method.

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

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

Why Choose Siemens 3RB3046-1XW1?

The Siemens 3RB3046-1XW1 is a robust electronic overload relay designed for motor protection in the 32–115 A range with a Class 10E trip characteristic.

Its combination of electronic overload protection, phase-failure and asymmetry protection, S3 stand-alone construction, 1 NO + 1 NC auxiliary contacts, screw-terminal connections and manual/automatic reset makes it suitable for industrial motor starters, OEM machinery and automation systems.

Siemens currently lists 3RB3046-1XW1 as an active product, so the exact article is suitable for procurement where this Class 10E, 32–115 A configuration is required.

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 3RB3046-1XW1?

It is a Siemens SIRIUS 3RB3 electronic overload relay for motor protection with a 32–115 A adjustable current range and Class 10E characteristic.

2. What is the current setting range?

The adjustable current range is 32–115 A.

3. What is the trip class?

The exact 3RB3046-1XW1 is Class 10E.

4. Does it provide phase-failure protection?

Yes. The 3RB30 Class 10E range provides phase-failure and asymmetry protection in addition to overload protection.

5. How many auxiliary contacts does it have?

The 3RB30 Class 10E range provides 1 NO + 1 NC auxiliary contacts.

6. Is it designed for stand-alone installation?

Yes. The 3RB3046-1XW1 is a Size S3 stand-alone 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 10E range.

10. Where can I buy Siemens 3RB3046-1XW1 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.