Microprocessor based overload relay - 3RB (Class 5 to 30E – Settable) - 3RB3113-4SB0

Product Description

Siemens 3RB3113-4SB0 Electronic Overload Relay – Advanced Microprocessor-Based Motor Protection Solution

The Siemens 3RB3113-4SB0 Electronic Overload Relay is a high-precision motor protection device designed to safeguard industrial motors against overload conditions, phase failures, phase imbalance, and ground faults. As part of the highly trusted Siemens SIRIUS 3RB3 Series, this microprocessor-based overload relay delivers superior protection accuracy, improved operational reliability, and enhanced equipment safety compared to traditional thermal overload relays. Built for modern industrial automation systems, the 3RB3113-4SB0 helps extend motor service life while minimizing costly downtime and maintenance expenses. The Siemens 3RB3 series is specifically developed for optimum inverse-time delayed protection of three-phase motors operating in 50/60 Hz power systems.

Designed for motors with an adjustable current range of 2.8A to 11.2A, the Siemens 3RB3113-4SB0 offers flexible protection for a wide variety of industrial applications. Whether protecting pumps, fans, conveyors, compressors, mixers, packaging equipment, or HVAC systems, the relay continuously monitors motor current and reacts quickly to abnormal operating conditions. Its electronic sensing technology provides significantly higher accuracy than conventional bimetal overload relays, ensuring dependable protection under both normal and heavy-duty starting conditions.

One of the key advantages of the 3RB3113-4SB0 Electronic Overload Relay is its adjustable trip class functionality. Engineers can select between Class 5E, 10E, 20E, and 30E based on the motor's starting characteristics and application requirements. Fast-starting motors benefit from lower trip classes, while heavy-load applications with extended acceleration times can utilize higher trip classes without nuisance tripping. This flexibility allows the relay to be adapted to diverse industrial processes while maintaining optimal motor protection.

Unlike traditional overload relays that rely on thermal elements, the Siemens 3RB3113-4SB0 employs advanced microprocessor-controlled current evaluation. This technology continuously calculates motor thermal conditions and detects overload situations before they can damage motor windings or insulation systems. By preventing overheating and excessive current stress, the relay significantly improves motor reliability and reduces maintenance requirements. Electronic protection technology also provides excellent repeatability and consistent performance across varying environmental conditions.

A major safety feature of the 3RB3113-4SB0 Motor Protection Relay is its integrated internal ground fault detection capability. Ground faults can cause serious motor damage and unexpected production interruptions. The relay continuously monitors motor current and identifies developing ground faults before they become critical failures. This additional layer of protection improves system safety, protects valuable equipment, and supports uninterrupted plant operations. Internal ground fault detection is a standard feature within the Siemens SIRIUS 3RB3 overload relay family.

The relay is designed in a compact S00 frame size and is intended for direct mounting onto Siemens SIRIUS contactors. This compact construction helps optimize control panel space while simplifying installation and wiring. The main circuit and auxiliary circuit utilize screw terminal connections, ensuring secure conductor retention, vibration resistance, and long-term electrical reliability in demanding industrial environments. The compact design also helps reduce engineering complexity and inventory requirements for OEMs and panel builders.

For seamless integration into industrial automation systems, the Siemens 3RB3113-4SB0 includes 1 Normally Open (1NO) and 1 Normally Closed (1NC) auxiliary contacts. These contacts can be used for motor trip indication, PLC monitoring, alarm signaling, control circuit interruption, and diagnostic functions. Integrated auxiliary contacts simplify control panel design while improving system visibility and fault monitoring capabilities. Similar Siemens 3RB3 relays are widely used in motor control centers, automation panels, and industrial process control systems.

The relay supports manual reset, automatic reset, and remote reset functions, providing flexibility for different operational requirements. Maintenance personnel can quickly restore operation following a trip event, while automated facilities can utilize remote reset capabilities to reduce downtime and improve process efficiency. Temperature compensation further ensures accurate protection performance across a broad ambient temperature range.

Built according to Siemens' stringent quality standards, the 3RB3113-4SB0 Electronic Overload Relay features a 690V rated insulation voltage, IP20 protection, and compliance with international motor protection standards. These features make it an ideal solution for manufacturing plants, water treatment facilities, HVAC installations, packaging machinery, food processing systems, material handling equipment, and industrial automation projects.

At SBsmart.in, we supply genuine Siemens industrial automation and motor protection products trusted by OEMs, panel builders, electrical contractors, maintenance engineers, and industrial buyers across India. When you choose the Siemens 3RB3113-4SB0 Electronic Overload Relay, you receive an authentic Siemens SIRIUS motor protection solution engineered for long-term reliability, enhanced equipment safety, and superior industrial performance.