Reliable protection for your appliances: voltage monitoring relays ZUBR
Modern appliances are an investment you want to keep for years. But fluctuations in the power supply can damage expensive electronics. That’s why ZUBR voltage relays are a smart choice to protect your devices from power surges.
How does the ZUBR voltage relay work?
ZUBR voltage relays constantly monitor the voltage level in the power supply. If a dangerous fluctuation is detected — whether an increase or a drop — the device instantly cuts off the power to prevent damage to connected appliances.
Once the voltage stabilizes, the relay activates a delay timer to ensure the network is steady. Only after that is power restored, helping to avoid repeated failures caused by brief power disturbances.
Models with additional current and power monitoring features are especially useful for landlords, workshop owners, office spaces, and anyone who wants to track energy consumption.
Advantages of ZUBR relays
- Great price-to-performance ratio
High reliability and an affordable price make ZUBR the best choice for both home and business use. - Lightning-fast response
Rapid reaction to voltage fluctuations is confirmed by testing and professional electricians' reviews. - Event log
The device stores voltage values from each emergency shutdown, allowing you to monitor the state of the power grid. - Flexible delay timer
A factory default of 3 seconds can be extended up to 10 minutes — especially useful for protecting compressor-based equipment. - Top-tier safety
Reliable terminals, a non-flammable V0-class polycarbonate case, high-quality components, and extensive testing ensure maximum protection.
ZUBR voltage relay models
⚡Single-phase models: ZUBR D2, CV2, MF2
These relays protect against voltage spikes, drops, and neutral wire breakage. They are installed in a distribution board (2-module width) and are available for 40 A, 50 A, or 63 A currents.
Core features:
- True RMS – high measurement accuracy even with unstable power supply.
- Thermal protection – automatic shutdown in case of overheating.
- Pro Mode – reduces false triggering caused by harmless voltage deviations.
- Advanced settings – hysteresis, protection from frequent switching, and more.
Model-specific features:
- ZUBR D2 – classic relay for voltage monitoring only.
- ZUBR CV2 – displays voltage plus either current or power (user-selectable).
- ZUBR MF2 – features three screens: voltage, current, and power.
⚡Three-phase models: ZUBR D6 and ZUBR 3F
These models provide protection against:
- High/low voltage
- Phase asymmetry
- Phase imbalance and sticking
- Incorrect phase sequence
- Universal relay for both single-phase and three-phase loads
- Replaces three individual single-phase relays — a cost-effective solution
- Available for 40 A, 50 A, or 63 A
- Designed exclusively for three-phase equipment
- Ideal for electric motors
- Operates via contactor (5 A rated)
Check out video reviews from professional electricians
ZUBR voltage monitoring relays are tested and shown in video reviews by professional electrician bloggers from different European countries. The videos are in different languages and a great way to see how the devices work, how to set them up, and how they are installed in real-life conditions:
Tablou electric echipat cu releu de protectie ZUBR • Romania
Kaip apsaugoti savo namus nuo pavojingų įtampos šuolių? • Lithuania
Napěťové relé ZUBR D6 • Czech Republic
Monitor bezpieczeństwa sieci domowej ZUBR • Poland
Watch these videos — they might be the reason you choose ZUBR.
How to choose the right model?
- For home and standard appliances — choose ZUBR D2 (voltage only). If you are planning a three-phase panel that requires three single-phase voltage relays, you can choose one of 2 options. You can choose 3 separate voltage relays ZUBR D2 or buy one ZUBR D6 and use it in single-phase load mode.
- For unstable grids and country houses — ZUBR CV2 or MF2 (for additional current/power monitoring).
- For three-phase equipment — ZUBR D6 or ZUBR 3F.
When selecting the rated current, match it to your main circuit breaker — the relay should be rated higher.
Setup and operation
ZUBR relays are easy to configure — even without technical experience:
- Set voltage thresholds
You can adjust factory settings if your appliances allow wider tolerances. - Set power-on delay
Recommended: increase to 180 seconds — especially for fridges and air conditioners. - Activate Pro Mode
Useful for weak or unstable grids where voltage often nears threshold limits. - Set current/power limits (for relevant models) — to avoid overloads and protect equipment.
What’s the difference between a voltage relay and a surge protector?
A surge protector only guards against short impulse spikes — it does not protect against consistent voltage deviations. ZUBR voltage relays offer complete protection from a wide range of electrical instabilities. Plus, you can precisely configure them to match your equipment's requirements.
Conclusion
If you want peace of mind and don’t want to worry about your appliances — choose ZUBR voltage monitoring relays. It’s a smart solution that protects your equipment, saves energy, and reduces costs.