Microprocessor based overload relay - 3RB (Class 10E) - 3RB3026-1QB0

Product Description

Siemens 3RB3026-1QB0 Electronic Overload Relay – Class 10E Motor Protection for Industrial Applications

The Siemens 3RB3026-1QB0 Electronic Overload Relay is a high-performance microprocessor-based motor protection device from the trusted SIRIUS 3RB3 series, engineered to provide reliable protection for three-phase motors against overload, phase failure, and phase asymmetry conditions. Designed for industrial automation and motor control systems, this solid-state overload relay ensures accurate thermal motor protection while reducing maintenance requirements and improving operational reliability. The relay features a 6A to 25A adjustable current range, Class 10E tripping characteristic, and compact S0 frame size, making it ideal for a wide range of motor protection applications.

Unlike conventional thermal overload relays that rely on bimetallic elements, the Siemens 3RB3026-1QB0 utilizes advanced electronic current sensing and microprocessor-controlled evaluation. This intelligent protection technology continuously monitors motor current and thermal conditions, enabling fast and precise detection of overload situations. The result is improved protection accuracy, better repeatability, and enhanced motor lifespan compared to traditional overload relay solutions.

The relay is equipped with a Class 10E tripping characteristic, specifically designed for motors with normal starting conditions. Class 10E protection provides rapid response to overload conditions while allowing standard motor acceleration without nuisance tripping. This makes the 3RB3026-1QB0 suitable for pumps, fans, compressors, conveyors, HVAC equipment, packaging machinery, and general industrial motor control applications.

With an adjustable current setting range of 6A to 25A, the relay offers flexibility for protecting a wide range of three-phase motors. Siemens specifies the relay as an electronic overload relay for motor protection with integrated overload monitoring and precise current adjustment, helping OEMs, panel builders, and maintenance engineers standardize motor protection systems across multiple applications.

A major safety feature of the Siemens 3RB3026-1QB0 Motor Protection Relay is its integrated phase failure and phase asymmetry protection. The relay continuously monitors all three phases and automatically trips when abnormal operating conditions occur. This proactive protection helps prevent motor overheating, winding damage, and unexpected equipment failures caused by single-phasing or unbalanced loads.

The 3RB3026-1QB0 is designed for direct mounting onto Siemens S0-size contactors, creating a compact and efficient motor starter assembly. It features robust screw-type terminals for both the main and auxiliary circuits, ensuring secure electrical connections and long-term reliability in industrial environments. The compact construction helps optimize control panel space while simplifying installation and maintenance.

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 interfacing, alarm signaling, remote monitoring, and control circuit interruption. This functionality improves system diagnostics and operational visibility while reducing panel wiring complexity.

The relay supports both manual and automatic reset functions, allowing users to choose the most suitable recovery method for their application. Automatic reset helps minimize downtime in automated systems, while manual reset provides additional safety where operator confirmation is required before restarting equipment.

Built according to IEC 60947-4-1 standards, the Siemens 3RB3026-1QB0 Electronic Overload Relay offers reliable performance across an operating temperature range of -25°C to +60°C, integrated temperature compensation, 690V insulation voltage, and 6kV impulse withstand voltage. These features make it suitable for manufacturing plants, water treatment facilities, HVAC systems, packaging machinery, and industrial automation projects.

At SBsmart.in, we provide genuine Siemens industrial automation and motor protection products trusted by industries across India. The Siemens 3RB3026-1QB0 delivers dependable motor protection, enhanced operational safety, and long-term industrial reliability.