Microprocessor based overload relay - 3RB (Class 5 to 30E – Settable) - 3RB3113-4NB0

Product Description

Siemens 3RB3113-4NB0 Electronic Overload Relay – Reliable Microprocessor-Based Motor Protection for Industrial Automation

The Siemens 3RB3113-4NB0 Electronic Overload Relay is a high-precision motor protection device engineered to safeguard three-phase motors against overload conditions, phase failure, phase imbalance, and ground faults. As part of the trusted Siemens SIRIUS 3RB3 Series, this microprocessor-based overload relay combines intelligent electronic sensing with advanced motor protection technology to deliver reliable performance in industrial automation systems.

Designed for motors operating within a 0.7A to 2.8A adjustable current range, the Siemens 3RB3113-4NB0 provides accurate thermal motor protection for small motors used in pumps, fans, conveyors, compressors, packaging machines, HVAC equipment, material handling systems, and process automation applications. Unlike conventional thermal overload relays that rely on bimetal strips, the 3RB3113-4NB0 utilizes electronic current measurement technology to continuously monitor motor conditions and react quickly to abnormal operating situations.

One of the most important advantages of the Siemens 3RB3113-4NB0 Electronic Overload Relay is its adjustable tripping class functionality. Users can select between Class 5E, 10E, 20E, and 30E protection characteristics depending on the motor's startup behavior and application requirements. This flexibility allows the relay to protect both standard-duty and heavy-duty motors while minimizing nuisance tripping during startup operations.

The microprocessor-controlled design continuously evaluates motor current and thermal conditions to provide highly accurate overload protection. By detecting overload conditions before excessive heat can damage motor windings, the relay helps extend motor lifespan, reduce maintenance costs, and improve plant productivity. Electronic sensing also provides superior repeatability and protection accuracy compared to traditional thermal overload devices.

A major safety feature of the 3RB3113-4NB0 Motor Protection Relay is its integrated phase failure and phase imbalance monitoring. Phase-related faults are among the most common causes of motor damage in industrial environments. The relay quickly identifies abnormal phase conditions and disconnects the motor before significant damage occurs, helping protect valuable equipment and minimize unplanned downtime.

The relay also incorporates ground fault detection functionality, providing an additional layer of protection for industrial motors. Ground faults can lead to serious electrical damage and production interruptions. By continuously monitoring motor current characteristics, the relay helps identify developing ground fault conditions before they become critical failures.

Built in the compact S00 frame size, the Siemens 3RB3113-4NB0 is designed for direct mounting onto Siemens SIRIUS contactors, creating a compact and efficient motor starter assembly. The space-saving design simplifies installation while reducing panel space requirements. Both the main and auxiliary circuits utilize reliable screw terminal connections, ensuring secure wiring and long-term electrical reliability in demanding industrial environments.

For enhanced control system integration, the relay includes 1 Normally Open (1NO) and 1 Normally Closed (1NC) auxiliary contacts. These contacts can be used for fault signaling, PLC monitoring, alarm systems, status indication, and motor control circuits. The integrated auxiliary contacts simplify panel design while improving visibility into motor operating conditions.

The Siemens 3RB3113-4NB0 supports manual reset, automatic reset, and remote reset functions, allowing users to configure the relay according to application requirements. This flexibility makes the device suitable for both standalone motor starters and fully automated industrial systems where rapid fault recovery is essential.

Designed according to Siemens' strict industrial quality standards, the relay offers reliable operation across a wide temperature range and complies with international motor protection requirements. Its robust construction and intelligent protection features make it an ideal solution for OEMs, panel builders, maintenance teams, and industrial operators seeking dependable motor protection.

At SBsmart.in, we supply genuine Siemens industrial automation and motor protection products trusted by industries throughout India. When you choose the Siemens 3RB3113-4NB0 Electronic Overload Relay, you receive an authentic Siemens SIRIUS motor protection solution engineered for maximum reliability, operational safety, and long-term performance.