Product Description

Siemens 3RB3016-1NB0 Electronic Overload Relay – 0.32–1.25 A, Class 10E

The Siemens 3RB3016-1NB0 is a microprocessor-based electronic overload relay from the Siemens SIRIUS 3RB3 series, designed for motor protection against overload, phase failure and asymmetry. The exact Siemens Industry Mall listing specifies an adjustable current range of 0.32–1.25 A, Class 10E, Size S00, contactor mounting, screw terminals for the main and auxiliary circuits, and manual-automatic reset. Siemens currently lists the product as active.

Siemens SIRIUS 3RB3 Electronic Overload Relay

The 3RB3016-1NB0 is an electronic motor-protection device for industrial electrical applications. Its electronic design monitors motor current and provides a defined Class 10E overload response.

The compact S00 contactor-mounted construction makes it suitable for use with compatible Siemens SIRIUS contactors in motor-starter assemblies. Siemens' 2025/2026 documentation also lists this exact article in the S00, Class 10E, screw-terminal range.

Typical applications include:

• Small industrial motors

• Pumps

• Fans and blowers

• Small compressors

• Conveyors

• Machine tools

• Production equipment

• Process machinery

• Motor starters

• Industrial electrical panels

Adjustable 0.32–1.25 A Current Range

The 3RB3016-1NB0 provides an adjustable current-setting range of 0.32 to 1.25 A. Siemens identifies the thermal current as 1.25 A.

The current setting should be selected according to the protected motor's nameplate current and the requirements of the complete motor-protection system.

The low current range makes this model suitable for smaller motors where precise electronic overload protection is required.

Class 10E Trip Characteristic

The exact 3RB3016-1NB0 is a Class 10E electronic overload relay. Siemens explicitly specifies CLASS 10E for this article.

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 operating conditions.

Electronic Overload Protection

The primary function of the 3RB3016-1NB0 is electronic motor-overload protection.

The relay 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 10E family provides overload, phase-failure and asymmetry protection.

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

The relay therefore provides broader motor protection than overload protection alone.

1 NO + 1 NC Auxiliary Contacts

The Siemens 3RB30 Class 10E range provides 1 NO + 1 NC auxiliary contacts. These contacts can be used for contactor disconnection, trip indication and control-panel signalling.

Typical uses include:

• Contactor control

• Trip indication

• Control-panel feedback

• Alarm signalling

• Motor fault indication

• Electrical interlocking

Contactor Mounting

The 3RB3016-1NB0 is designed for contactor mounting and belongs to Size S00. Siemens specifies S00 as the overload-relay size and the compatible contactor size.

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

Screw-Terminal Connections

The 3RB3016-1NB0 uses screw-type terminals for both the main current circuit and auxiliary/control circuit. Siemens also specifies a removable terminal for the auxiliary and control circuit.

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

Manual and Automatic Reset

The exact 3RB3016-1NB0 supports manual and automatic RESET. Siemens identifies the product with a manual-automatic-reset configuration.

Siemens specifies a typical recovery time of approximately 3 minutes after an overload trip with automatic reset, while manual and remote reset recovery are specified as 0 minutes under the applicable conditions.

The appropriate reset mode should be selected according to the motor and machine-control requirements.

TEST Function and Self-Monitoring

The Siemens 3RB30 Class 10E range includes TEST functionality, switch-position indication and self-monitoring.

These functions can support:

• Commissioning

• Functional testing

• Troubleshooting

• Preventive maintenance

• Electrical-panel servicing

Electrical Characteristics

The 3RB3016-1NB0 is specified with:

• 1.25 A thermal current

• 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

The product documentation also specifies an installation altitude of up to 2,000 m under the applicable conditions.

Compact S00 Design

The 3RB3016-1NB0 has a compact S00 housing with approximate dimensions of:

• Height: 79 mm

• Width: 45 mm

• Depth: 73 mm

Siemens also specifies approximately 6 mm side clearance where required.

This compact construction is suitable for:

• Motor starters

• Electrical control panels

• Machine-control assemblies

• OEM electrical equipment

• Industrial replacement applications

Industrial Motor Applications

Small Pumps

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

Fans and Blowers

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

Small Compressors

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

Conveyors

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

Machine Tools

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

Production Equipment

The device can be used for motor-protection requirements in suitable manufacturing and industrial production equipment.

Suitable for OEMs, Panel Builders and Electrical Dealers

The 3RB3016-1NB0 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.

SB Smart supplies Siemens industrial electrical components for procurement requirements across Faridabad, Delhi NCR, Gurgaon/Gurugram, Noida, Haryana, Punjab, Mumbai and other major Indian cities.

Key Features

• Siemens SIRIUS 3RB3 electronic overload relay

• Article number 3RB3016-1NB0

• Electronic overload protection

• 0.32–1.25 A adjustable current range

• Class 10E

• 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

• 0.32–1.25 A adjustable range: Suitable for low-current industrial motors.

• Class 10E: 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 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 3RB3016-1NB0?

The Siemens 3RB3016-1NB0 is a compact electronic overload relay for motor protection in the 0.32–1.25 A range with a Class 10E 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 small 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 3RB3016-1NB0?

It is a Siemens SIRIUS 3RB3 electronic overload relay for motor protection with a 0.32–1.25 A adjustable current range and Class 10E characteristic.

2. What is the current setting range?

The adjustable current range is 0.32–1.25 A.

3. What is the trip class?

The exact 3RB3016-1NB0 is Class 10E.

4. Does it provide phase-failure protection?

Yes. The Siemens 3RB30 Class 10E 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 3RB3016-1NB0 is designed for S00 contactor mounting.

7. Does it use screw terminals?

Yes. Siemens specifies screw connections for both the main and auxiliary circuits.

8. What reset options are available?

It supports manual and automatic RESET.

9. What are its dimensions?

The approximate dimensions are 79 mm height × 45 mm width × 73 mm depth.

10. Where can I buy Siemens 3RB3016-1NB0 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.