Product Description

Siemens 3RB3036-2WW1 Electronic Overload Relay – 20–80 A, Class 20E

The Siemens 3RB3036-2WW1 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 20 to 80 A, a Class 20E trip characteristic, Size S2 construction, and stand-alone installation with a straight-through transformer in the main circuit. The auxiliary circuit uses screw terminals, with manual and automatic reset available. Siemens currently lists the exact article as an active product.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3036-2WW1 belongs to the Siemens SIRIUS 3RB30 electronic overload relay family, developed for protecting motors against overload, phase failure and asymmetry.

Its microprocessor-based electronic design continuously monitors motor current and provides a defined Class 20E overload response, making it suitable for industrial motor-protection systems.

Typical applications include:

• Industrial motor control

• Pumps

• Fans and blowers

• Compressors

• Conveyors

• Machine tools

• Production machinery

• Process equipment

• Industrial automation

• OEM control panels

Adjustable 20–80 A Current Range

The 3RB3036-2WW1 provides an adjustable current-setting range of 20 to 80 A. Siemens specifies 80 A thermal current for this exact article.

This broad adjustment range allows the 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 20E Trip Characteristic

The exact 3RB3036-2WW1 is a Class 20E electronic overload relay. Siemens' Industry Mall description explicitly identifies this article as Class 20E.

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

The selected trip characteristic should be matched to the motor starting time and actual application conditions.

Electronic Overload Protection

The primary function of the 3RB3036-2WW1 is electronic motor-overload protection.

The relay continuously evaluates motor current and initiates the appropriate control response 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 motor starting duration

Correct adjustment of the current setting 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 excessive current imbalance can result in increased motor heating and operating stress. Electronic protection therefore provides broader three-phase motor protection than overload protection alone.

1 NO + 1 NC Auxiliary Contacts

The 3RB3036-2WW1 provides 1 normally open (NO) and 1 normally closed (NC) auxiliary contact. The 3RB30 Class 20E range is specified with this auxiliary-contact arrangement.

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 convenient interface between the overload relay and the associated control circuit.

Stand-Alone Installation

The 3RB3036-2WW1 is designed for stand-alone installation rather than direct contactor mounting. Siemens specifies a straight-through transformer in the main circuit and a screw-terminal auxiliary circuit.

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

S2 Size

The 3RB3036-2WW1 is a Size S2 electronic overload relay. Siemens also identifies S2 as the associated contactor size for the product family.

The S2 design is suitable for larger industrial motor-control assemblies and panels.

Screw-Terminal Auxiliary Connection

The product uses screw terminals for the auxiliary circuit. Siemens specifies screw-terminal auxiliary connections for this exact article and for the S2/S3 versions of the 3RB30 range.

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

Manual and Automatic Reset

The 3RB3036-2WW1 supports manual and automatic RESET. Siemens explicitly includes both reset modes in the product description.

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

Siemens documentation for this configuration indicates a typical 3-minute recovery time after an overload trip with automatic reset, while manual and remote reset can have a typical 0-minute recovery time under the specified conditions.

TEST Function and Self-Monitoring

The Siemens 3RB30 Class 20E range includes a TEST function, switch-position indication and self-monitoring.

These functions can support:

• Commissioning

• Functional testing

• Troubleshooting

• Preventive maintenance

• Control-panel servicing

Electrical and Environmental Characteristics

For the 3RB3036-2WW1, Siemens specifies an insulation voltage of 690 V and 6 kV surge-voltage resistance. The product has approximately 0.2 W total power loss at rated current in the hot operating state.

The relay is specified for an operating ambient temperature range of -25 °C to +60 °C and an installation altitude up to 2,000 m.

These conditions should be considered when designing and installing the motor-control panel.

Industrial Motor-Control Applications

Pumps

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

Fans and Blowers

The Class 20E 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 against excessive mechanical loading and abnormal phase conditions.

Production Machinery

The S2 design 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 3RB3036-2WW1 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.

Its combination of 20–80 A adjustable current range, Class 20E protection, phase-failure and asymmetry protection, S2 construction, stand-alone installation, screw-terminal auxiliary connection and manual/automatic reset makes it suitable for industrial motor-protection systems.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3036-2WW1

• Microprocessor-based electronic overload protection

• 20–80 A adjustable current range

• Class 20E

• Size S2

• 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 RESET

• Automatic RESET

• TEST function

• Self-monitoring

• Switch-position indication

• 690 V insulation voltage

• 6 kV surge-voltage resistance

Benefits

• 20–80 A adjustable range: Suitable for a broad range of industrial motor currents.

• Class 20E: 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 asymmetry.

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

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

• Screw terminals: Offers a familiar industrial wiring method.

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

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

• S2 construction: Suitable for larger industrial motor-control applications.

Why Choose Siemens 3RB3036-2WW1?

The Siemens 3RB3036-2WW1 is a robust electronic overload relay for motor protection in the 20–80 A range with a Class 20E trip characteristic. Siemens' current Industry Mall identifies it as a Size S2, stand-alone electronic overload relay with a straight-through main-circuit transformer, screw auxiliary terminals and manual/automatic reset.

Its combination of overload, phase-failure and asymmetry protection, 1 NO + 1 NC auxiliary contacts, TEST/self-monitoring functions and S2 construction makes it suitable for industrial motor-control panels, automation systems and OEM machinery.

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 3RB3036-2WW1?

It is a Siemens SIRIUS 3RB3 electronic overload relay for motor protection with a 20–80 A adjustable current range and Class 20E characteristic.

2. What is the current setting range?

The adjustable current range is 20–80 A.

3. What is the trip class?

The exact 3RB3036-2WW1 is Class 20E.

4. Does it provide phase-failure protection?

Yes. The Siemens 3RB30 Class 20E 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.

6. Is it designed for stand-alone installation?

Yes. The 3RB3036-2WW1 is designed for stand-alone installation 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 3RB3036-2WW1 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.