Product Description

Siemens 3RB3016-2PB0 Electronic Overload Relay – 1–4 A, Class 20E

The Siemens 3RB3016-2PB0 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for reliable protection of three-phase motors against overload, phase failure and asymmetry. The exact model provides an adjustable current range of 1 to 4 A, a Class 20E trip characteristic, Size S00 construction and contactor mounting. Siemens specifies screw terminals for both the main and auxiliary circuits, with manual and automatic reset.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3016-2PB0 belongs to the Siemens SIRIUS 3RB30 electronic overload relay family, designed for electronic monitoring and protection of industrial motors.

Its microprocessor-based electronic design evaluates motor current and provides a defined Class 20E overload response. The compact S00 contactor-mounted design allows the relay to be used with compatible Siemens SIRIUS contactors in motor-starter assemblies.

Typical applications include:

• Industrial motor starters

• Pumps

• Fans and blowers

• Compressors

• Conveyors

• Machine tools

• Production equipment

• Process machinery

• Industrial electrical panels

• Motor protection applications

Adjustable 1–4 A Current Range

The 3RB3016-2PB0 has an adjustable current-setting range of 1 to 4 A, with a rated operational current of 4 A at 400 V AC-3. Siemens documentation also lists guide motor-power ranges of approximately 0.37–1.5 kW at 400 V, 0.37–2.2 kW at 500 V, and 0.55–3 kW at 690 V, depending on the actual motor and application.

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 3RB3016-2PB0 is a Class 20E electronic overload relay. Siemens' product documentation identifies the device as Class 20E.

Class 20E provides a defined overload tripping characteristic suitable for motors with corresponding starting requirements. The selected trip class should be matched to the motor starting time and actual operating conditions.

Electronic Overload Protection

The primary function of the 3RB3016-2PB0 is electronic motor-overload protection.

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

This helps protect compatible 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 dependable motor protection.

Phase-Failure and Asymmetry Protection

The Siemens 3RB30 Class 20E family provides overload, phase-failure and asymmetry protection. Siemens specifically lists these protection functions for the series.

These functions are important for three-phase motors because phase loss or current imbalance can increase motor heating and electrical stress.

1 NO + 1 NC Auxiliary Contacts

The 3RB3016-2PB0 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” indication.

These contacts can be used for:

• Contactor control

• Trip indication

• Panel feedback

• Alarm signalling

• Motor fault indication

• Electrical interlocking

Contactor Mounting

The 3RB3016-2PB0 is designed for contactor mounting and belongs to Size S00. Siemens identifies the S00 format for this product and provides compact dimensions of approximately 79 mm height, 45 mm width and 73 mm depth.

This allows the overload relay to be combined with a compatible Siemens SIRIUS contactor to form a compact motor-starter assembly.

Screw-Terminal Connections

The 3RB3016-2PB0 uses screw-type terminals for both the main current circuit and auxiliary/control circuit. Siemens specifies a removable auxiliary/control terminal for this configuration.

This provides a conventional connection method for industrial electrical panels, motor starters and maintenance applications.

Manual and Automatic Reset

The exact 3RB3016-2PB0 supports manual and automatic RESET. Siemens identifies both reset modes for this product.

The reset method should be selected according to the motor-control requirements and the operating conditions of the machine.

TEST Function and Self-Monitoring

The Siemens 3RB30 Class 20E family includes:

• TEST function

• Switch-position indication

• Self-monitoring

• Manual and automatic RESET

These functions support commissioning, functional testing, troubleshooting and maintenance.

Electrical and Environmental Characteristics

The 3RB3016-2PB0 is specified with:

• 690 V maximum operating voltage

• 50–60 Hz operating frequency

• 690 V insulation voltage

• 6 kV surge-voltage resistance

• Approximately 0.6 W total power loss at rated current in the hot operating state

• Approximately 0.2 W power loss per pole

• Operating ambient temperature of -25 °C to +60 °C

• Installation altitude up to 2,000 m under specified conditions

These specifications should be considered during electrical-panel design and installation.

Industrial Motor Applications

Pumps

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

Fans and Blowers

The Class 20E characteristic can be used for suitable motors with corresponding starting requirements.

Small Compressors

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

Conveyors

The relay can be incorporated into suitable conveyor motor-starter assemblies.

Machine Tools

Its compact S00 design is suitable for machine-control panels and motor starters.

Production Equipment

The relay can be used for motor protection in suitable manufacturing and production machinery.

Suitable for OEMs, Panel Builders and Electrical Dealers

The 3RB3016-2PB0 is suitable for OEM equipment manufacturers, electrical panel builders, industrial maintenance teams, industrial buyers and electrical product dealers.

For SB Smart, this product is best positioned around industrial electrical product supply, dealer/distributor procurement and replacement sourcing, without claiming automation integration or automation-service work.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3016-2PB0

• Microprocessor-based electronic overload protection

• 1–4 A adjustable current range

• Class 20E

• Size S00

• Contactor mounting

• Screw terminals for main and auxiliary circuits

• Removable auxiliary/control terminal

• 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

• 1–4 A adjustable range: Suitable for low-current industrial motor applications.

• Class 20E: Provides a defined overload characteristic for compatible motor-starting requirements.

• Electronic protection: Provides continuous motor-current monitoring.

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

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

• Contactor mounting: Supports compact S00 motor-starter assemblies.

• Screw terminals: Provides a familiar industrial wiring solution.

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

• TEST and self-monitoring: Assist commissioning and maintenance.

• Compact S00 design: Helps optimize control-panel space.

Why Choose Siemens 3RB3016-2PB0?

The Siemens 3RB3016-2PB0 is a compact electronic overload relay for motor protection in the 1–4 A range with a Class 20E trip characteristic.

Its combination of electronic overload, phase-failure and asymmetry protection, S00 contactor mounting, 1 NO + 1 NC auxiliary contacts, screw connections and manual/automatic reset makes it suitable for industrial motor starters, electrical panels, OEM equipment and replacement requirements.

For SB Smart, the product should be positioned around Siemens industrial electrical product supply and procurement, making it relevant for industrial buyers, panel builders, maintenance teams and electrical product dealers across India.

Delivery Across India

SB Smart supplies Siemens industrial electrical products across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and other major cities across India.

Major delivery locations include:

• Faridabad

• Delhi

• Gurgaon/Gurugram

• 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 3RB3016-2PB0?

It is a Siemens SIRIUS 3RB3 electronic overload relay for motor protection with a 1–4 A adjustable current range and Class 20E characteristic.

2. What is the current setting range?

The adjustable current range is 1–4 A.

3. What is the trip class?

The exact 3RB3016-2PB0 is Class 20E.

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” indication.

6. Is it contactor-mounted?

Yes. The 3RB3016-2PB0 is designed for S00 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. The 3RB30 Class 20E range includes TEST functionality, switch-position indication and self-monitoring.

10. Where can I buy Siemens 3RB3016-2PB0 in India?

SB Smart supplies Siemens industrial electrical products in India, including SIRIUS electronic overload relays and related motor-protection components for industrial buyers, panel builders, maintenance requirements and product procurement.