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

Product Description

Siemens 3RB3113-4SB0 Electronic Overload Relay – Intelligent Motor Protection with Adjustable Class 5E to 30E

The Siemens 3RB3113-4SB0 Electronic Overload Relay is a high-performance microprocessor-based motor protection device designed to provide accurate and dependable protection for three-phase motors in industrial applications. As part of the globally trusted Siemens SIRIUS 3RB3 Series, this advanced overload relay combines electronic current sensing, intelligent fault detection, and flexible protection settings to help maximize motor lifespan while reducing costly downtime and maintenance expenses.

Designed for motors operating within a 2.8A to 11.2A adjustable current range, the Siemens 3RB3113-4SB0 delivers precise protection against overload conditions, phase imbalance, phase failure, and internal ground faults. Unlike conventional thermal overload relays, this electronic overload relay continuously monitors motor current using microprocessor-based technology, allowing faster and more accurate responses to abnormal operating conditions. Siemens developed the 3RB3 series specifically for optimum inverse-time delayed protection of three-phase motors operating in 50/60 Hz industrial networks.

One of the most significant advantages of the 3RB3113-4SB0 Electronic Overload Relay is its adjustable trip class functionality. Engineers and maintenance teams can select between Class 5E, Class 10E, Class 20E, and Class 30E protection characteristics depending on motor starting requirements. Fast-starting motors can be protected using lower trip classes, while applications requiring longer acceleration periods can utilize higher trip classes without nuisance tripping. This flexibility makes the relay suitable for pumps, fans, compressors, conveyors, mixers, packaging equipment, and various automation systems.

The Siemens 3RB3113-4SB0 utilizes advanced electronic sensing technology instead of traditional bimetallic elements. This provides substantially greater measurement accuracy and repeatability while reducing the influence of ambient temperature variations. By detecting overload conditions before motor windings overheat, the relay helps prevent insulation damage, bearing stress, and unexpected motor failures. The result is increased equipment reliability, lower maintenance costs, and improved plant productivity.

A key safety feature of the 3RB3113-4SB0 Motor Protection Relay is its integrated ground fault detection capability. The relay continuously analyzes motor current and can identify developing ground faults before they cause severe damage to motors or associated equipment. This additional protection layer improves operational safety and reduces the risk of costly production interruptions. Siemens incorporates internal ground fault detection as a core feature within the 3RB3 electronic overload relay platform.

The relay is designed in the compact S00 frame size and is intended for direct mounting onto Siemens SIRIUS contactors. This compact configuration helps reduce control panel space requirements while simplifying installation and wiring. Both the main circuit and auxiliary circuit utilize reliable screw terminal connections, ensuring secure conductor retention and long-term electrical reliability in demanding industrial environments. Similar S00-frame 3RB3 relays support direct contactor mounting and simplified motor starter assembly.

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 trip indication, PLC monitoring, alarm signaling, fault diagnostics, and control circuit interruption. The integrated auxiliary contacts improve system visibility while reducing the need for additional components within the control panel. Similar Siemens 3RB3 overload relays provide integrated 1NO + 1NC auxiliary contacts for automation and monitoring functions.

The relay supports manual reset, automatic reset, and remote reset functionality, providing flexibility for different operating environments. Whether installed in standalone motor starters or sophisticated automated production lines, the relay enables quick system recovery while maintaining high levels of motor protection. The automatic reset capability can improve process continuity in suitable applications, while manual reset enhances operational safety where required.

Built according to Siemens' rigorous industrial standards, the 3RB3113-4SB0 Electronic Overload Relay offers a rated insulation voltage of 690V AC, 6kV impulse withstand voltage, and dependable operation across ambient temperatures ranging from -25°C to +60°C. Integrated temperature compensation ensures consistent protection performance regardless of environmental conditions. These characteristics make the relay suitable for manufacturing plants, water treatment facilities, HVAC installations, packaging machinery, process industries, and industrial automation systems.

At SBsmart.in, we supply genuine Siemens industrial automation and motor protection products trusted by OEMs, control panel manufacturers, electrical contractors, maintenance engineers, and industrial buyers across India. When you purchase 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 operational performance.