Microprocessor based overload relay - 3RB (Class 5 to 30E – Settable) - 3RB3143-4XW1

Product Description

Siemens 3RB3143-4XW1 Electronic Overload Relay – Advanced Motor Protection with Adjustable Class 5E to 30E

The Siemens 3RB3143-4XW1 Electronic Overload Relay is a high-performance microprocessor-based motor protection solution designed to safeguard industrial motors against overload conditions, phase failures, unbalanced loads, and excessive current draw. As part of the highly reliable Siemens SIRIUS 3RB3 Series, this advanced electronic overload relay delivers precise motor protection, superior operational reliability, and flexible adjustment capabilities for demanding industrial applications.

Engineered for motors operating within a 32A to 115A current range, the Siemens 3RB3143-4XW1 utilizes solid-state microprocessor technology to provide significantly higher protection accuracy compared to conventional thermal overload relays. Its intelligent electronic monitoring continuously evaluates motor current conditions and responds rapidly to overload situations, helping prevent motor damage, production downtime, and costly maintenance expenses. The relay is designed for Size S3 motor starters and supports stand-alone installation with straight-through transformer current sensing.

One of the most valuable features of the 3RB3143-4XW1 overload relay is its adjustable trip class functionality. Unlike standard overload relays with fixed trip classes, this Siemens relay allows users to select between Class 5E, 10E, 20E, and 30E protection settings. This flexibility enables engineers to optimize motor protection according to application requirements. Fast-starting motors can be protected with lower trip classes, while heavy-duty motors requiring longer starting times can utilize higher trip class settings without nuisance tripping.

The Siemens 3RB3143-4XW1 Electronic Motor Protection Relay incorporates advanced electronic overload detection and integrated ground fault monitoring capabilities. The relay can detect abnormal operating conditions before they cause severe motor damage, ensuring maximum operational reliability and extending equipment service life. Its built-in ground fault protection provides an additional layer of safety for industrial motors operating in demanding environments.

With a current adjustment range of 32A to 115A, the relay supports a broad variety of industrial motors. It is suitable for protecting motors with power ratings ranging from approximately 18.5 kW to 55 kW at 400V, 22 kW to 75 kW at 500V, and 30 kW to 90 kW at 690V. This wide protection range makes the 3RB3143-4XW1 an excellent choice for manufacturing facilities, process plants, HVAC systems, water treatment facilities, conveyor systems, compressors, pumps, fans, and material handling equipment.

The relay includes integrated 1 Normally Open (1NO) and 1 Normally Closed (1NC) auxiliary contacts. These contacts enable direct integration into motor control circuits, alarm systems, PLC interfaces, and automation platforms. The NC contact is typically used for contactor tripping, while the NO contact provides status indication and fault signaling. This integrated design reduces installation complexity and simplifies control panel wiring.

Designed for harsh industrial environments, the Siemens SIRIUS 3RB3143-4XW1 features a robust construction with a rated insulation voltage of 1000V, impulse withstand voltage of 8kV, and IP20 protection. The relay operates reliably in ambient temperatures ranging from -25°C to +60°C and provides automatic temperature compensation across the entire operating range. These features ensure accurate protection performance regardless of environmental conditions.

The relay supports manual, automatic, and remote reset functions, offering flexibility for various operational requirements. Maintenance personnel can quickly restore equipment operation following a fault event while ensuring safe restart procedures. Remote reset functionality further enhances automation capabilities and supports integration into advanced industrial control systems.

The Siemens 3RB3143-4XW1 Electronic Overload Relay is widely used in industries such as manufacturing, oil & gas, chemical processing, water treatment, power generation, mining, food processing, HVAC, and industrial automation. Its combination of intelligent motor protection, adjustable trip classes, ground fault monitoring, and Siemens engineering excellence makes it a trusted solution for critical motor protection applications worldwide.

At SBsmart.in, we supply genuine Siemens industrial automation and motor protection products trusted by OEMs, panel builders, electrical contractors, maintenance teams, and industrial buyers throughout India. When you purchase the Siemens 3RB3143-4XW1, you receive an authentic Siemens SIRIUS motor protection solution designed for superior reliability, enhanced equipment safety, and long-term operational performance.