One-Stop Solution To Electric

Safeguard your critical equipment and electrical systems from irregular voltage conditions. Trust TOSUNlux’s advanced voltage monitoring solutions to provide reliable protection while ensuring optimized performance. Our premium relays put you in complete control.

TOSUNlux Control Relay

As an electrical equipment supplier, TOSUNlux has launched the TRV8-03 and TRV8-04 voltage relays – engineered to protect your critical equipment. These advanced relays continuously monitor voltage levels and trip immediately when they deviate from set parameters. Protect motors, generators and electrical systems from undervoltage, overvoltage, phase failure and more.Crafted with precision and utilizing high-quality materials, the TOSUNlux Control Relay ensures reliable performance and durability in every application.

TOSUNlux’s 3-phase voltage relays allow 8 different rated operating voltages to be set via a knob, providing flexible operation, simple setup and reliable performance, making them an indispensable safeguard for your operations.

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Take a look at TOSUNlux control relay collection, including voltage relay and time relay.

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Meticulous Engineering

Employing stringent design and testing, every relay meets the highest standards for industrial-grade performance. Our engineers leverage decades of experience to create robust, failsafe voltage monitoring solutions. Each relay undergoes rigorous quality checks before leaving our facilities.

Customizable Options

From monitoring ranges to output configurations, we customize relays to your exact voltage control needs. Don’t settle for off-the-shelf products – get a solution precisely tailored to your application requirements. Our flexibility ensures seamless integration.

Robust Construction

Premium components and housings withstand harsh operating conditions without compromise. TOSUNlux relays are built to last, capable of performing reliably in demanding industrial environments. Expect years of dependable service.

Simplified Integration

Compact sizing with universal mounting means easy installation in any control panel. Our space-saving designs and versatile mounting options reduce complexity. Plug-and-play functionality gets your voltage monitoring up and running quickly.

Global Certifications

Our relays meet international safety approvals for supply across multiple markets. You can confidently deploy TOSUNlux solutions worldwide, assured they comply with all relevant standards and regulations in your region.

Attentive Service

Our team is not just here for you; we’re invested in your enduring success. We offer readily accessible tech support to ensure everything runs smoothly for you. You can depend on our experts – whether it’s about choosing the right product or resolving maintenance and troubleshooting issues.

About TOSUNlux

As a leading control relay manufacturer, TOSUNlux delivers premium voltage monitoring solutions for global markets. Our diverse product range includes three-phase voltage relays, undervoltage relays, phase monitoring relays and more. Combining innovative designs with stringent quality control, TOSUNlux ensures reliable power protection for countless applications.

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All Your Questions

Here are some frequently asked questions about TOSUNlux Control Relays

Voltage monitoring relays act as protectors for vital systems like motors, generators, and other electrical functions. They’re crucial in ensuring that voltage inconsistency doesn’t risk these systems. These monitors are indispensable across a plethora of industries – put them to use in manufacturing plants, building management setups, renewable energy stations or farms; they’re even used widely in civic facilities.

Undervoltage protection trips the relay output if supply voltage drops too low, preventing equipment damage from underpower conditions. Overvoltage protection does the opposite, de-energizing loads when voltage exceeds safe thresholds to avoid failures from power surges or overloads.

Key factors are the required monitoring range, number of phases, output contact configuration, and desired timing/reset functions. Proper sizing for your system voltage and load is critical. TOSUNlux offers guidance to specify the ideal relay for your voltage protection needs.

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Fortify your operations with TOSUNlux voltage relays. Inquire today for premium protection and peace of mind.



TOSUNlux voltage relays provide robust voltage monitoring across industrial sectors. Safeguard manufacturing equipment from irregular power conditions that lead to downtime. Protect critical building management systems like HVAC and elevators. Ensure reliable operation of renewable energy assets like solar farms and wind turbines. And defend municipal infrastructure from damaging undervoltage or overvoltage events.

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We Help Your Business to Connect and Grow on Large Scale

TOSUNlux has its own design team with a 5-people in-house design team, which provides 4-5 new series of products every year for our clients.

Choosing the Perfect Voltage Monitoring Relay for You

Voltage relays are essential in guarding your pricey electrical equipment and avoiding expensive shutdowns or breakdowns. But with a baffling array of choices available, picking the right one can be quite overwhelming. Don’t worry—this guide outlines the main things you need to think about when selecting a voltage relay that best fits your requirements.

Define Monitoring Requirements 

The first step is understanding what voltage conditions you need to monitor. Is it just undervoltage protection? Or do you also need to guard against overvoltage events? Make sure to select a relay designed for your specific monitoring requirements.

Determine System Voltage 

Voltage monitoring relays are rated for specific voltage ranges. You’ll need to match this range to your system’s nominal operating voltage. For example, a 400V three-phase industrial plant would require a different relay than a 120V single-phase residential application.

Consider the Number of Phases 

Relays come in single-phase and three-phase models. Ensure you get a relay compatible with the power setup you’re monitoring. Single-phase is common for residential, while three-phase covers industrial equipment and large commercial buildings.

Specify Contact Configurations 

Relays use output contacts to trigger connected devices like alarms, circuit breakers, or control systems when tripped. Specify whether you need Normally Open or Normally Closed output contacts and how many poles you require.

Timing Functions 

Many relays include adjustable time delays and recycle delays to avoid nuisance tripping from short voltage spikes or prevent high-inrush loads from causing undervoltage. Match these timing functions to your operational needs.

Environmental Conditions 

If your voltage relay will be used in harsh environments like high heat, humidity, dust or vibrations, you’ll want a model built with a ruggedized, environmentally sealed housing to ensure reliable performance.

Other Customization Needs 

Premium suppliers like TOSUNlux offer flexible customization of voltage ranges, contact configurations, timing curves, and other parameters. Don’t settle for an off-the-shelf relay – get one perfectly tailored to your voltage protection requirements.

With these factors thoughtfully considered, you can navigate the many voltage monitoring options and select the ideal relay. One that seamlessly integrates into your system to deliver robust voltage monitoring capabilities and defense against irregular supply conditions.

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