Product Description

Siemens 3RB3036-1WW1 Electronic Overload Relay – 20–80 A, Class 10E

The Siemens 3RB3036-1WW1 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for motor protection against overload, phase failure and phase asymmetry. The exact article provides an adjustable current range of 20 to 80 A, a Class 10E trip characteristic, Size S2 construction, and stand-alone installation with a straight-through transformer in the main circuit. The auxiliary and control circuit uses screw terminals, with manual and automatic reset.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3036-1WW1 belongs to the Siemens SIRIUS 3RB30 electronic overload relay family, designed for industrial motor-protection applications where electronic current monitoring and a defined overload characteristic are required.

The relay is suitable for integration into motor-control panels and automation systems where a stand-alone overload relay arrangement is preferred.

Typical applications include:

• Industrial motor control

• Pumps

• Fans and blowers

• Compressors

• Conveyors

• Production machinery

• Machine tools

• Process equipment

• Industrial automation

• OEM control panels

Adjustable 20–80 A Current Range

The 3RB3036-1WW1 provides an adjustable current-response range of 20 to 80 A, with an 80 A thermal current.

This broad adjustment range allows the relay to be set 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 3RB3036-1WW1 is a Class 10E electronic overload relay. Siemens' product data explicitly identifies the trip class as CLASS 10E.

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

Electronic Overload Protection

The primary function of the 3RB3036-1WW1 is electronic motor-overload protection.

The relay continuously evaluates the motor current and responds 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

• Unsuitable motor-starting conditions

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

Phase-Failure and Asymmetry Protection

The Siemens 3RB30 electronic overload relay family provides overload, phase-failure and asymmetry protection.

Phase failure or significant current imbalance can cause additional 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 3RB3036-1WW1 provides 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 incorporated into:

• Contactor-control circuits

• Trip indication

• PLC feedback

• Alarm signalling

• Motor fault monitoring

• Control-system interlocking

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

Stand-Alone Installation

The 3RB3036-1WW1 is designed for stand-alone installation, rather than direct mounting onto the contactor. Siemens specifies a straight-through transformer for the main current circuit.

This arrangement provides flexibility when the overload relay needs to be positioned separately within a motor-control panel.

The product is a Size S2 overload relay, and Siemens identifies S2 as the corresponding contactor size for applicable SIRIUS systems.

Screw-Terminal Connections

The 3RB3036-1WW1 uses screw-type terminals for the auxiliary and control circuit. Siemens also specifies a removable auxiliary/control terminal.

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

Manual and Automatic Reset

The exact 3RB3036-1WW1 supports manual and automatic RESET. Siemens specifies a typical recovery time of approximately 3 minutes with automatic reset, while manual and remote reset recovery are specified as 0 minutes under the applicable conditions.

The reset strategy should be selected according to the requirements of the motor-control application.

TEST Function and Self-Monitoring

The Siemens 3RB30 range includes TEST functionality, switch-position indication and self-monitoring. These functions support commissioning, functional checks and maintenance activities.

They can be useful for:

• Commissioning

• Functional testing

• Troubleshooting

• Preventive maintenance

• Control-panel servicing

Electrical and Environmental Characteristics

The 3RB3036-1WW1 has an insulation voltage of 690 V and a surge-voltage resistance of 6 kV. Siemens specifies 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, with temperature compensation across this range and a maximum installation altitude of 2,000 m.

Compact S2 Design

Siemens specifies the following approximate dimensions for the 3RB3036-1WW1:

• Height: 81 mm

• Width: 55 mm

• Depth: 109 mm

The compact S2 enclosure is suitable for industrial motor-control panels while allowing stand-alone installation.

Industrial Motor-Control Applications

Pumps

The relay can protect compatible pump motors against overload, phase failure and current 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 from 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 medium-current 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 3RB3036-1WW1 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 10E protection, S2 stand-alone construction, phase-failure and asymmetry protection, screw-terminal auxiliary connections and manual/automatic reset makes it suitable for industrial motor-protection systems.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3036-1WW1

• Microprocessor-based electronic overload protection

• 20–80 A adjustable current range

• Class 10E

• Size S2

• Stand-alone installation

• Straight-through transformer in main circuit

• Screw terminals for auxiliary/control 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 10E: 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 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 medium-current industrial motor-control applications.

Why Choose Siemens 3RB3036-1WW1?

The Siemens 3RB3036-1WW1 is a reliable electronic overload relay for motor protection in the 20–80 A range with a Class 10E trip characteristic.

Its combination of overload, phase-failure and asymmetry protection, 1 NO + 1 NC auxiliary contacts, stand-alone S2 construction, screw-terminal connections and flexible reset options makes it suitable for industrial motor-control panels, automation systems and OEM machinery.

For applications where the overload relay needs to be installed separately from the contactor, the stand-alone design provides additional panel-layout flexibility.

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 3RB3036-1WW1?

It is a Siemens SIRIUS 3RB3 electronic overload relay for motor protection with a 20–80 A adjustable current range and Class 10E characteristic.

2. What is the current setting range?

The adjustable current range is 20–80 A.

3. What is the trip class?

The exact 3RB3036-1WW1 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 specified for contactor disconnection and the NO contact for the “tripped” message.

6. Is it designed for stand-alone installation?

Yes. The 3RB3036-1WW1 is a Size S2 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-type terminals for the auxiliary and control circuit.

8. What reset options are available?

It supports manual and automatic RESET. Siemens specifies approximately 3 minutes recovery with automatic reset under the applicable conditions.

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 3RB3036-1WW1 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.