The Siemens 3RB3026-1VB0 Electronic Overload Relay is a high-performance microprocessor-based motor protection device from the trusted SIRIUS 3RB3 series, designed to provide reliable protection for three-phase motors against overload, phase failure, and phase imbalance conditions. Engineered for industrial automation and motor control applications, this electronic overload relay delivers accurate thermal motor protection while helping reduce downtime, improve equipment reliability, and extend motor service life. The relay features a 10A to 40A adjustable current range, Class 10E tripping characteristic, and compact Size S0 construction for seamless integration with Siemens contactors.
Unlike conventional thermal overload relays that rely on bimetallic elements, the Siemens 3RB3026-1VB0 utilizes advanced electronic current sensing and microprocessor-controlled evaluation. This technology continuously monitors motor operating conditions and thermal loading, providing highly accurate overload detection and consistent protection performance regardless of ambient temperature variations. The electronic design ensures superior repeatability and long-term reliability compared to traditional overload protection methods.
The relay incorporates a Class 10E tripping characteristic, making it ideal for motors with standard starting requirements. Class 10E protection provides rapid response to overload conditions while allowing normal motor startup without nuisance tripping. This protection profile is commonly used for pumps, fans, compressors, conveyors, HVAC equipment, and general industrial machinery where reliable motor protection is essential.
With an adjustable current setting range of 10A to 40A, the 3RB3026-1VB0 supports a wide range of motor applications. According to Siemens specifications, it is suitable for motors rated approximately 5.5–18.5 kW at 400V, 7.5–22 kW at 500V, and 11–37 kW at 690V, providing flexibility for OEMs, panel builders, and industrial maintenance teams.
A key safety feature of the Siemens 3RB3026-1VB0 Motor Protection Relay is its integrated phase failure and phase imbalance protection. The relay continuously monitors all three motor phases and automatically disconnects the motor when abnormal conditions occur. This helps prevent overheating, winding damage, and premature motor failure caused by single-phasing or uneven current distribution.
The relay is designed for direct contactor mounting and is compatible with Siemens S0 frame contactors, creating a compact and efficient motor starter assembly. Durable screw-type terminals for both power and auxiliary circuits ensure secure electrical connections and reliable long-term performance in industrial environments.
For enhanced monitoring and automation integration, the relay includes 1 Normally Open (1NO) and 1 Normally Closed (1NC) auxiliary contacts. These contacts can be used for overload trip indication, PLC communication, alarm signaling, remote monitoring, and control circuit interruption. The integrated auxiliary contact arrangement simplifies panel wiring while improving system diagnostics.
The Siemens 3RB3026-1VB0 supports both manual and automatic reset functions, allowing users to select the most suitable recovery method for their application. Automatic reset helps reduce downtime in automated systems, while manual reset provides additional operational safety where operator confirmation is required before restart.
Built according to IEC 60947-4-1 standards, the relay offers 690V insulation voltage, 6kV impulse withstand voltage, IP20 protection, and an operating temperature range of -25°C to +60°C. Its rugged design and proven Siemens engineering make it ideal for manufacturing plants, water treatment facilities, packaging machinery, HVAC systems, and industrial automation projects.
At SBsmart.in, we supply genuine Siemens industrial automation and motor protection products trusted by industries across India. The Siemens 3RB3026-1VB0 Electronic Overload Relay delivers dependable motor protection, enhanced operational safety, and long-term industrial reliability.
| Specification | Details |
|---|---|
| Product Name | Electronic Overload Relay |
| Brand | Siemens |
| Series | SIRIUS 3RB3 |
| Model Number | 3RB3026-1VB0 |
| SKU | 3RB3026-1VB0 |
| Product Type | Microprocessor-Based Electronic Overload Relay |
| Protection Technology | Solid-State / Electronic |
| Current Setting Range | 10A – 40A |
| Trip Class | Class 10E |
| Relay Size | S0 |
| Mounting Type | Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1NO + 1NC |
| Number of Poles | 3 Pole |
| Protection Functions | Overload Protection, Phase Failure Protection, Phase Imbalance Protection |
| Reset Type | Manual / Automatic Reset |
| Rated Operational Current | 40A |
| Rated Operational Voltage | Up to 690V AC |
| Motor Rating @ 400V | 5.5 – 18.5 kW |
| Motor Rating @ 500V | 7.5 – 22 kW |
| Motor Rating @ 690V | 11 – 37 kW |
| Operating Frequency | 50/60 Hz |
| Rated Insulation Voltage (Ui) | 690V |
| Rated Impulse Withstand Voltage (Uimp) | 6kV |
| Protection Rating | IP20 |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +80°C |
| Relative Humidity | 10% – 95% |
| Height | 87 mm |
| Width | 45 mm |
| Depth | 84 mm |
| Standards Compliance | IEC 60947-4-1 |
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