Product Description

Siemens 3RB3046-1XB0 Electronic Overload Relay – 32–115 A, Class 10E

The Siemens 3RB3046-1XB0 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for reliable protection of industrial motors against overload, phase failure and asymmetry. It provides an adjustable current range of 32 to 115 A, a Class 10E trip characteristic, S3 size, and contactor mounting. Siemens specifies screw terminals for both the main and auxiliary circuits and manual/automatic reset for this exact article.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3046-1XB0 belongs to the Siemens SIRIUS 3RB electronic overload relay family, developed for motor protection in industrial control and automation systems.

Its electronic, microprocessor-based design continuously evaluates motor current and provides a defined overload response. The relay is designed for S3 contactor mounting, allowing integration into compatible Siemens SIRIUS motor-starter assemblies.

Typical applications include:

• Industrial motor control

• Pumps

• Fans and blowers

• Compressors

• Conveyors

• Production machinery

• Machine tools

• Process equipment

• Industrial automation

• OEM control panels

Adjustable 32–115 A Current Range

The 3RB3046-1XB0 provides an adjustable current-setting range of 32 to 115 A. Siemens specifies 115 A thermal current for the device.

This wide adjustment range allows the overload relay to be configured 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 10E Trip Characteristic

The exact 3RB3046-1XB0 is a Class 10E electronic overload relay. Siemens' current product data and catalog identify this article specifically as the 32–115 A Class 10E S3 version.

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

Electronic Overload Protection

The primary function of the 3RB3046-1XB0 is electronic protection against motor overload.

The relay monitors motor current and responds when the measured operating condition exceeds the configured overload characteristic.

This helps protect motors against:

• Prolonged overcurrent

• Excessive mechanical loading

• Motor overheating caused by overload

• Abnormal operating conditions

• Unsuitable motor-starting conditions

Correct adjustment of the current setting is essential for reliable protection.

Phase-Failure and Asymmetry Protection

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

Phase failure and current asymmetry can cause abnormal motor heating and operating stress, so these functions provide additional protection for three-phase motors.

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 auxiliary contacts can be incorporated into:

• Contactor-control circuits

• Trip indication

• PLC feedback

• Alarm signalling

• Motor fault monitoring

• Control-system interlocking

The auxiliary contacts allow the overload relay's operating and trip condition to be communicated to the surrounding control system.

Contactor Mounting

The 3RB3046-1XB0 is specifically designed for contactor mounting and belongs to Size S3. Siemens also identifies S3 as the compatible contactor size.

This mounting arrangement helps create a compact motor-starter assembly with a compatible SIRIUS contactor.

It is suitable for:

• Motor starters

• Industrial control panels

• Automation cabinets

• OEM machinery

• Process-control systems

Screw-Terminal Connections

The 3RB3046-1XB0 uses screw-type terminals for the main current circuit and auxiliary/control circuit. Siemens confirms both connection types for this article.

The auxiliary and control terminal is removable, supporting practical panel wiring, commissioning and maintenance.

Manual and Automatic Reset

The exact 3RB3046-1XB0 supports manual and automatic RESET. Siemens specifies both reset options for this article.

Siemens lists a typical recovery time after an overload trip of approximately 3 minutes with automatic reset, while manual reset and remote-reset conditions can provide 0-minute recovery time under specified conditions.

The appropriate reset strategy should be selected according to the machine and control-system design.

TEST Function and Self-Monitoring

The Siemens 3RB30 Class 10E family includes a TEST function, switch-position indication and self-monitoring.

These functions can assist during:

• Commissioning

• Functional testing

• Troubleshooting

• Preventive maintenance

• Control-panel servicing

Electrical and Thermal Characteristics

The 3RB3046-1XB0 is a Size S3 relay with approximately 4.6 W total power loss at rated current in the hot operating state, or approximately 1.53 W per pole. Siemens specifies an insulation voltage of 1,000 V and 8 kV surge-voltage resistance.

The device is specified for an operating ambient temperature of -25 °C to +60 °C, with temperature compensation across that range.

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

Installation Dimensions

Siemens specifies approximate dimensions of:

• Height: 106 mm

• Width: 70 mm

• Depth: 124 mm

The required side clearance is approximately 6 mm where applicable.

This S3 housing is intended for larger motor-control assemblies where sufficient panel space is available.

Industrial Motor-Control Applications

Pumps

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

Fans and Blowers

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

Compressors

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

Conveyors

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

Production Machinery

Its S3 construction makes it suitable for larger industrial motor-control assemblies.

Process Automation

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

Suitable for OEMs and Panel Builders

The 3RB3046-1XB0 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its combination of 32–115 A adjustable current, Class 10E protection, phase-failure and asymmetry protection, S3 construction, contactor mounting, screw terminals and manual/automatic reset makes it suitable for a broad range of industrial motor-protection applications.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3046-1XB0

• Microprocessor-based electronic overload protection

• 32–115 A adjustable current range

• Class 10E

• Size S3

• 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

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

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

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

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

• Contactor mounting: Supports compact S3 motor-starter assemblies.

• Screw terminals: Provides a familiar industrial wiring method.

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

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

• Robust S3 design: Suitable for larger industrial motor-control applications.

Why Choose Siemens 3RB3046-1XB0?

The Siemens 3RB3046-1XB0 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 contactor mounting, 1 NO + 1 NC auxiliary contacts, screw connections and flexible reset options makes it suitable for industrial motor starters, OEM machinery and automation panels.

Siemens currently lists the 3RB3046-1XB0 as an active product, so this exact article is suitable for procurement where the 32–115 A Class 10E 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 3RB3046-1XB0?

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 3RB3046-1XB0 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 contactor-mounted?

Yes. The 3RB3046-1XB0 is designed for S3 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. Siemens specifies a TEST function, switch-position indication and self-monitoring for the 3RB30 Class 10E range.

10. Where can I buy Siemens 3RB3046-1XB0 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.