Microprocessor based overload relay - 3RB (Class 20E) - 3RB3036-2WB0

Product Description

Siemens 3RB3036-2WB0 Electronic Overload Relay – Class 20E Motor Protection for Heavy-Duty Industrial Applications

The Siemens 3RB3036-2WB0 Electronic Overload Relay is a high-performance microprocessor-based motor protection device designed to deliver reliable and accurate protection for three-phase motors operating in demanding industrial environments. As part of the trusted Siemens SIRIUS 3RB3 Series, this electronic overload relay combines advanced monitoring technology with intelligent motor protection functions to safeguard equipment against overload conditions, phase failure, and thermal stress. Featuring a 20A to 80A adjustable current range and a Class 20E tripping characteristic, the 3RB3036-2WB0 is specifically engineered for motors that require extended starting times and heavy-duty operational performance.

Unlike conventional thermal overload relays that depend on bimetallic elements, the Siemens 3RB3036-2WB0 utilizes electronic current sensing and microprocessor-controlled evaluation. This advanced protection technology continuously monitors motor current and operating conditions, allowing the relay to react more accurately and consistently to overload situations. By detecting abnormal operating conditions before they can damage motor windings or insulation systems, the relay helps reduce maintenance costs, extend motor lifespan, and improve overall plant reliability.

One of the major advantages of the 3RB3036-2WB0 Electronic Overload Relay is its Class 20E tripping characteristic. Class 20E protection is specifically designed for motors that experience longer acceleration times during startup. Equipment such as conveyors, crushers, mixers, compressors, material handling systems, pumps, and heavy-duty process machinery often require extended startup periods. The Class 20E characteristic allows these motors to start normally while still providing effective protection against prolonged overload conditions.

The relay offers an adjustable current setting range of 20A to 80A, making it suitable for protecting a broad range of industrial motors. According to Siemens technical specifications, the 3RB3036-2WB0 supports motor ratings from approximately 11 kW to 37 kW at 400V, 15 kW to 55 kW at 500V, and 18.5 kW to 75 kW at 690V. This flexibility allows OEMs, panel builders, and maintenance professionals to standardize protection solutions while reducing inventory complexity.

A critical feature of the Siemens 3RB3036-2WB0 Motor Protection Relay is its integrated phase failure detection capability. Loss of one phase can quickly lead to overheating, increased current draw, and severe motor damage. The relay continuously monitors all three phases and automatically disconnects the motor whenever dangerous phase-loss conditions are detected. This proactive protection minimizes downtime and prevents costly equipment failures.

Designed for seamless integration into industrial motor starter assemblies, the 3RB3036-2WB0 features contactor mounting and robust screw-type terminals for both main and auxiliary circuits. The compact S2-size design helps optimize panel space while simplifying installation and maintenance procedures. Reliable screw terminals ensure secure electrical connections and long-term operational stability, even in vibration-prone industrial environments.

For improved automation and monitoring capabilities, the relay includes 1 Normally Open (1NO) and 1 Normally Closed (1NC) auxiliary contacts. The NO contact is typically used for trip indication and status monitoring, while the NC contact is used for contactor disconnection during overload events. These integrated contacts support PLC integration, alarm systems, fault diagnostics, and remote monitoring applications.

The Siemens 3RB3036-2WB0 supports both manual and automatic reset functions, providing flexibility for different industrial applications. Automatic reset functionality helps reduce downtime in automated systems, while manual reset offers enhanced operator control and safety for critical processes. Recovery after automatic reset typically occurs within a few minutes once the overload condition has cleared.

Built according to Siemens' rigorous industrial standards, the 3RB3036-2WB0 Electronic Overload Relay features a 690V rated operating voltage, IP20 protection, integrated temperature compensation, and reliable operation across ambient temperatures ranging from -25°C to +60°C. These features make it suitable for manufacturing facilities, water treatment plants, food processing systems, packaging equipment, HVAC installations, mining operations, 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 engineers across India. When you purchase the Siemens 3RB3036-2WB0 Electronic Overload Relay, you receive an authentic Siemens SIRIUS motor protection solution designed for superior reliability, enhanced safety, and long-term industrial performance.