Product Description

Siemens 3RB3036-1WB0 Electronic Overload Relay – 20–80 A, Class 10E

The Siemens 3RB3036-1WB0 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for motor protection against overload, phase failure and current asymmetry. It provides an adjustable current range of 20 to 80 A, a Class 10E trip characteristic, Size S2 construction and contactor mounting. Siemens specifies screw terminals for both the main and auxiliary circuits, along with manual and automatic reset.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3036-1WB0 belongs to the Siemens SIRIUS 3RB30 electronic overload relay family, designed for electronic monitoring and protection of industrial motors.

The relay continuously evaluates motor current and provides a defined electronic overload response. Its S2 contactor-mounting design allows 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 20–80 A Current Range

The 3RB3036-1WB0 provides an adjustable current-setting range of 20 to 80 A. Siemens specifies 80 A thermal current for this product.

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 10E Trip Characteristic

The exact 3RB3036-1WB0 is a Class 10E electronic overload relay. Siemens' product data explicitly identifies the trip class as CLASS 10E.

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 conditions.

Electronic Overload Protection

The primary function of the 3RB3036-1WB0 is electronic protection against motor overload.

The relay monitors 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 important for reliable motor protection.

Phase-Failure and Asymmetry Protection

The Siemens 3RB30 Class 10E range provides overload, phase-failure and asymmetry protection. These functions help protect three-phase motors from abnormal current conditions that can increase motor heating.

Phase-failure protection is particularly useful because operation with a missing phase can produce abnormal current and additional thermal stress.

1 NO + 1 NC Auxiliary Contacts

The 3RB3036-1WB0 provides 1 normally open (NO) and 1 normally closed (NC) auxiliary contact. Siemens documentation specifies the NC contact for contactor disconnection and the NO contact for the “tripped” indication.

These auxiliary contacts can be incorporated into:

• Contactor-control circuits

• Trip indication

• PLC feedback

• Alarm signalling

• Motor fault monitoring

• Control-system interlocking

This provides a practical interface between the overload relay and the surrounding control system.

Contactor Mounting

The 3RB3036-1WB0 is designed for contactor mounting and is a Size S2 overload relay. Siemens identifies S2 as the relay size and the compatible contactor size.

This allows it to form part of a compact motor-starter assembly with a compatible SIRIUS contactor.

Typical applications include:

• Motor starters

• Industrial control panels

• Automation cabinets

• OEM machinery

• Process-control systems

Screw-Terminal Connections

The 3RB3036-1WB0 uses screw-type terminals for both the main current circuit and auxiliary/control circuit. Siemens also specifies a removable auxiliary/control terminal.

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

The main terminals support substantial conductor cross-sections suitable for the 20–80 A current class.

Manual and Automatic Reset

The exact 3RB3036-1WB0 supports manual and automatic RESET. Siemens identifies both reset modes for this product.

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

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

TEST Function and Self-Monitoring

The Siemens 3RB30 electronic overload relay family includes TEST functionality, switch-position indication and self-monitoring. These functions support commissioning, troubleshooting and maintenance.

They can be useful during:

• Commissioning

• Functional testing

• Troubleshooting

• Preventive maintenance

• Control-panel servicing

Electrical and Thermal Characteristics

The 3RB3036-1WB0 has an insulation voltage of 690 V and a surge-voltage resistance of 6 kV. Siemens specifies approximately 4.6 W total power loss at rated current in the hot operating state, or approximately 1.53 W per pole.

The specified operating ambient temperature range is -25 °C to +60 °C, with temperature compensation over this range. The maximum installation altitude is 2,000 m under the specified conditions.

These parameters should be considered during motor-control-panel design and thermal planning.

Compact S2 Design

The 3RB3036-1WB0 has an S2 housing with approximate dimensions of:

• Height: 99 mm

• Width: 55 mm

• Depth: 104 mm

The compact format is suitable for industrial motor-control assemblies and automation cabinets.

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 used for motors with corresponding starting requirements.

Compressors

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

Conveyors

It 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 3RB3036-1WB0 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 contactor mounting, phase-failure and asymmetry protection, screw terminals, auxiliary signalling and manual/automatic reset makes it suitable for industrial motor-protection applications.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3036-1WB0

• Microprocessor-based electronic overload protection

• 20–80 A adjustable current range

• Class 10E

• Size S2

• 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

• 690 V insulation voltage

• 6 kV surge-voltage resistance

Benefits

• 20–80 A adjustable range: Suitable for a broad range of medium-current industrial motors.

• Class 10E: Provides a defined overload characteristic for compatible motor-starting conditions.

• Electronic monitoring: Provides continuous evaluation of motor current.

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

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

• Contactor mounting: Supports compact S2 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 support commissioning and maintenance.

• Compact S2 design: Helps integrate the relay into industrial control panels.

Why Choose Siemens 3RB3036-1WB0?

The Siemens 3RB3036-1WB0 is a practical electronic overload relay for motor protection in the 20–80 A range with a Class 10E trip characteristic.

Its combination of electronic overload protection, phase-failure and asymmetry protection, S2 contactor mounting, 1 NO + 1 NC auxiliary contacts, screw connections and manual/automatic reset makes it suitable for motor starters, industrial automation panels and OEM machinery.

The compact 55 mm-wide S2 housing also supports efficient control-panel integration while retaining the electrical connections required for this current class.

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 3RB3036-1WB0?

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 3RB3036-1WB0 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.

6. Is it contactor-mounted?

Yes. The 3RB3036-1WB0 is designed for S2 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 TEST functionality, switch-position indication and self-monitoring for this 3RB30 configuration.

10. Where can I buy Siemens 3RB3036-1WB0 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.