TBT8-A01 Phase Voltage Relay Intelligent Motor Protector Voltage Overload Protector Phase Failure Relay

Quick Detail:

1.motor protection circuit breaker

2.Control for connection of moving equipment(site equipment,agricultural equipent,refrigerated trucks).

-Control for protection of persons and equipment against the consequences of reverse running.

-Normal/emergency power supply switching.

-Protection against the risk of a driving load(phase failure).

Description:

TBT8 Series: The Sophisticated Voltage Guardian for Three-Phase Motor and System Integrity

In the demanding environment of industrial automation, the three-phase induction motor is an indispensable workhorse, powering everything from conveyor belts and pumps to compressors and machine tools. The reliability and longevity of these critical assets are inextricably linked to the quality of the power supplied to them. Voltage-related faults—including phase loss, severe asymmetry (phase unbalance), overvoltage, and undervoltage—are among the leading causes of motor winding failure, excessive heat generation, and catastrophic downtime. Traditional thermal overload relays offer no defense against these electrical supply pathologies. The TBT8 Series Three-Phase Voltage Monitoring Relay is engineered to fill this critical protection gap. It serves as an intelligent, dedicated sentinel for your three-phase systems, continuously analyzing supply quality and preemptively disconnecting equipment before damaging electrical conditions can cause harm. By focusing exclusively on precise voltage measurement and analysis, it provides a foundational layer of protection that is essential for maximizing motor life, ensuring process continuity, and safeguarding significant capital investment.

Advanced Three-Phase Supply Analysis for Proactive Protection

The TBT8’s core intelligence lies in its ability to perform detailed, real-time analysis of the three-phase supply, moving beyond simple presence/absence detection.

· Dual System Compatibility: The series is offered in two models tailored for different global grid standards. The TBT8-A is designed for wye/star configurations (monitoring Phase-to-Neutral voltages: 127V, 230V, etc.), while the TBT8-B is for delta configurations (monitoring Phase-to-Phase voltages: 220V, 380V, 415V, etc.). This specialized approach ensures optimal accuracy and relevance for the installation.

· Comprehensive Fault Detection: It is programmed to identify all critical voltage faults:

· Phase Loss / Under voltage: Detects when a phase is completely missing or drops below a safe threshold.

· Overvoltage: Protects against supply surges that can saturate motor cores and increase current draw.

· Phase Asymmetry (Unbalance): A particularly insidious fault where voltages are unequal, causing negative sequence currents that lead to severe overheating. The TBT8 allows adjustment of the asymmetry threshold from 5% to 15%.

· Incorrect Phase Sequence: Can prevent reverse rotation of motors.

Precision Engineering with Fully Configurable Thresholds and Delays

Recognizing that no two applications are identical, the TBT8 provides extensive user adjustability for a perfect fit.

· Adjustable Voltage Thresholds: The trip points for overvoltage and undervoltage are not fixed. Users can adjust them within a range of 2% to 20% of the selected nominal voltage (Un), allowing protection to be finely tuned to both the motor's tolerance and the specific stability of the local grid.

· Intelligent Timing Logic: To prevent nuisance tripping on brief, harmless transients, the device incorporates an adjustable trip delay from 0.1 to 10 seconds. A fixed 0.5-second run-up delay at power-up allows the supply to stabilize before monitoring begins, ignoring startup transients. The relay also features a built-in reset time of 1000ms.

· High-Fidelity Measurement: All protective decisions are based on highly accurate data, thanks to a measurement error of ≤1% and excellent long-term stability characterized by a low temperature coefficient of 0.05% per °C.

Clear Indication, Robust Output, and Durable Construction

Designed for integration into industrial control panels, the TBT8 is both user-friendly and built to last.

· Instant Visual Status: A green LED provides clear confirmation of power supply and healthy monitoring operation. A separate red LED indicates the status of the output relay, offering immediate visual diagnostics.

· Reliable Switching Interface: The device features a 1 PDT (Poled Double Throw) output relay with a 10A (AC1) contact rating. This robust output can directly control the coil of a main contactor or circuit breaker, providing a secure and reliable disconnection path for the protected load.

· Industrial-Grade Longevity and Safety: Constructed for millions of operations, it boasts a mechanical life of 10 million cycles and an electrical life of 100,000 cycles (AC1). Its IP40 front panel / IP20 terminal protection guards against dust and accidental contact. Compliance with Overvoltage Category III and Pollution Degree 2 standards confirms its suitability for harsh industrial environments. Its compact, DIN-rail mountable design (95.5x18x64mm) ensures easy installation in any control cabinet.

Critical Applications for Enhanced System Reliability

The TBT8 Series is indispensable in any setting where three-phase motor health and system stability are priorities:

· Industrial Motor Control Centers (MCCs): Protecting pumps, fans, compressors, and machine tool drives from supply irregularities.

· HVAC Systems: Safeguarding large chiller, cooling tower, and air handling unit motors in commercial buildings.

· Water and Wastewater Treatment: Ensuring the reliability of critical aeration blowers, raw water, and sludge pumps.

· Material Handling & Processing: Protecting motors on conveyors, crushers, mixers, and extruders from phase failures that can lead to jams and burnout.

· Renewable Energy Integration: Monitoring the grid connection point for generators or as a pre-check for automated transfer switches.

Conclusion:

The Essential Investment in Predictive Electrical Protection

The TBT8 Series Three-Phase Voltage Monitoring Relay transcends the role of a simple protective device. It is an essential component of a predictive maintenance strategy, preventing failures before they occur by continuously auditing the quality of the incoming power. By offering precise, configurable protection against voltage asymmetries, loss, and deviations—threats invisible to traditional overload relays—it directly contributes to reduced maintenance costs, extended motor lifespan, and dramatically improved overall system uptime. For facility managers, it delivers peace of mind. For system integrators, it provides a reliable, standards-compliant building block for robust control system design. In an era where operational efficiency is paramount, installing a TBT8 is a proactive declaration that your critical motor-driven systems are not only powered but are intelligently and vigilantly protected.

Applications:

-Control for connection of moving equipment(site equipment,agricultural

equipent,refrigerated trucks).

-Control for protection of persons and equipment against the

consequences of reverse running.

-Normal/emergency power supply switching.

-Protection against the risk of a driving load(phase failure).

Specifications:

Competitive Advantage:

Advantages of Wenzhou DAQUAN Electric Co., Ltd

1. Innovation Leadership

With 258 patents and 27 years of industry experience, we lead in R&D of industrial control devices like relays and timers, ensuring cutting-edge product performance.

2. Global Certifications

Our products hold CE, ROHS, IEC, TUV certifications plus ISO9001, meeting strict international standards for seamless global market access.

3. Scale Supply Stability

Backed by a 7,800㎡ factory, 499-strong team, and 70M RMB annual output, we guarantee efficient production and timely delivery for bulk orders.