Microprocessor based overload relay - 3RB (Class 20E) - 3RB3026-2QB0

Product Description

Siemens 3RB3026-2QB0 Electronic Overload Relay – Class 20E Advanced Motor Protection for Industrial Applications

The Siemens 3RB3026-2QB0 Electronic Overload Relay is a high-performance microprocessor-based motor protection device engineered to provide reliable protection for three-phase motors operating in demanding industrial environments. As part of the globally recognized Siemens SIRIUS 3RB3 Series, this electronic overload relay combines intelligent monitoring technology with precise overload protection to safeguard motors against overload conditions, phase failure, phase imbalance, and thermal stress. Designed with a 6A to 25A adjustable current range and Class 20E tripping characteristic, the 3RB3026-2QB0 is ideal for applications involving heavy-duty motor starting and extended acceleration periods.

Unlike conventional thermal overload relays that rely on bimetallic elements, the Siemens 3RB3026-2QB0 utilizes advanced electronic current sensing and microprocessor-controlled evaluation. This intelligent technology continuously monitors motor operating conditions and accurately calculates thermal loading. As a result, the relay responds more precisely to overload situations, helping prevent motor overheating, insulation deterioration, winding damage, and costly equipment failures. Electronic overload protection also offers greater accuracy and repeatability compared to traditional thermal protection devices.

A major advantage of the 3RB3026-2QB0 Electronic Overload Relay is its Class 20E tripping characteristic. Class 20E protection is specifically designed for motors that require longer startup times or operate under heavy starting loads. Equipment such as conveyors, crushers, mixers, compressors, pumps, material handling systems, and process machinery often experience prolonged acceleration periods. The Class 20E curve allows these motors to start normally while still ensuring reliable protection against prolonged overload conditions.

The relay features an adjustable current setting range of 6A to 25A, allowing it to protect a wide variety of industrial motors. This flexibility enables OEMs, panel builders, and maintenance engineers to standardize motor protection solutions while reducing inventory complexity. The relay is designed for inverse-time delayed protection, ensuring motor protection characteristics closely match actual motor thermal behavior.

One of the most important protection functions integrated into the Siemens 3RB3026-2QB0 Motor Protection Relay is phase failure and phase imbalance protection. Single-phasing is one of the most common causes of motor overheating and premature failure. The relay continuously monitors all three phases and automatically trips whenever dangerous operating conditions occur. This proactive protection helps minimize downtime, reduce maintenance costs, and extend equipment lifespan.

The 3RB3026-2QB0 is designed in a compact Size S0 frame and supports direct contactor mounting. It integrates seamlessly with compatible Siemens SIRIUS contactors, allowing panel builders to create compact and efficient motor starter assemblies. Both the main and auxiliary circuits utilize durable screw terminal connections, ensuring secure wiring, simplified installation, and long-term reliability in industrial environments.

For enhanced control and monitoring capabilities, the relay includes 1 Normally Open (1NO) and 1 Normally Closed (1NC) auxiliary contacts. These contacts can be used for overload trip indication, PLC integration, alarm signaling, fault diagnostics, and control circuit interruption. The built-in auxiliary contacts simplify panel design and improve system visibility for maintenance personnel.

The Siemens 3RB3026-2QB0 Electronic Overload Relay supports both manual and automatic reset functionality, providing flexibility for different industrial applications. Automated systems benefit from reduced downtime through automatic reset capability, while manual reset ensures enhanced safety in critical operations where operator intervention is required before restart.

Built according to Siemens' stringent quality standards, the relay offers reliable operation across a wide temperature range and delivers consistent protection performance throughout its service life. With temperature compensation, IP20 protection, and compliance with international motor protection standards, the 3RB3026-2QB0 is suitable for manufacturing facilities, water treatment plants, HVAC systems, food processing units, packaging machinery, and industrial automation projects.

At SBsmart.in, we supply genuine Siemens industrial automation and motor protection products trusted by OEMs, panel builders, electrical contractors, and maintenance professionals across India. When you purchase the Siemens 3RB3026-2QB0, you receive an authentic Siemens SIRIUS motor protection solution engineered for superior reliability, enhanced safety, and long-term industrial performance.