Voltage monitoring relays are crucial for protecting sensitive electronic equipment from fluctuations in power supply. These devices act as a safeguard, preventing damage caused by overvoltage, undervoltage, or phase imbalances. Investing in a reliable relay ensures the longevity and stable operation of your valuable machinery.
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Discover now our comparison of the best Voltage Monitoring Relays. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best Voltage Monitoring Relays are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the Voltage Monitoring Relays in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.
No. 1
Voltage Monitor Module, DC 0-99.9V Relay Controller Board for Overvoltage Undervoltage Control Voltage...
- Digital display DC voltage detection, control the relay output.
- DC 6~80V relay interface board with 2 buttons for easy operation. With clear LED display, convenient to check the value.
- Adjustable Voltage Detection Range: DC 0~99.9V.
- When the measured voltage is lower than the lower limit or higher than upper limit value, the relay works. Can be used for voltage detection switch, battery over/under voltage protector or discharge meter. Comes with a cover for protection.
No. 2
Over Under Voltage Protection Relay Adjustable Voltage Monitoring Relay 35MM Rail Mount Undervoltage...
- 2 INDICATOR LIGHT: Action time of over-voltage relay can be adjusted, 2 sets of normally open and normally closed contacts, 2 indicator lights indicate various working conditions
- ADJUSTABLE: The overvoltage protector is not additional auxiliary power supply is required. Both over-voltage and under-voltage value can be adjusted
- REAL-TIME MONITOR: The overvoltage undervoltage protector relay is convenient to use, real-time monitoring of dc overvoltage and undervoltage faults
- RAIL MOUNT: The voltage monitoring relay made of meterial, with standard modular structure, rail type installation
- APPLICATION: The motor overvoltage protector can be used for dc motor, battery, UPS power supply, dc switchgear, dc panel, industrial control system
No. 3
NOYITO Voltage Relay Module Upper Lower Limit Detection Control Switch Off ON Over Voltage Protection Battery...
- NOYITO Voltage Relay Module . Voltage detection display range: 0 - 99.9V; Voltage detection error: ±0.1V;
- Module working voltage:: DC 10-16V (12V version) DC18-28V (DC24V version) ("Note: The 24V pulse charger may have more than 30V pulse voltage and cannot be used as the power supply for this relay board.").
- Module working current: standby average 16mA/12V, relay pull-in 45mA/12V, digital tube off standby current 6mA/12V;
- Relay parameters: a set of conversion (normally open normally closed point), contact load: 10A/277VAC 10A/30 DC (NOTE： the maximum DC load 30V 10A) (maximum load current is 1A at 50V DC voltage).
- Relay Load: 10A / 277VAC 10A / 30 DC Max
No. 4
DVRD Voltage Monitoring Relay DC 12V/24V/36V/48V Over-Voltage and Undervoltage Protector Relay(DC12V)
- IMPORTANT PARAMETERS: ❶Protection function: over voltage, under voltage; ❷Rated voltage: DC 12V/24V/36V/48V; ❸Overvoltage regulation range: 13-17v; ❹Undervoltage adjustment range:10-14v; ❺Contact capacity: 6A 250VAC (resistivity).
- REAL-TIME MONITORING: The voltage monitoring relay could achieve real-time monitoring of dc overvoltage and undervoltage faults, and over-voltage, under-voltage value, and action time can be adjusted.
- MAIN ADVANTAGE: The voltage monitoring relay is of 2 sets of normally open and normally closed contacts, 2 indicator lights indicate various working conditions, no additional auxiliary power supply is required.
- 35MM GUIDE RAIL: With 35mm guide rail and standard modular structure, the voltage monitoring relay is easy to install, easy to operate.
- TYPICAL APPLICATIONS: The voltage monitoring relay is typically applied in dc motor, battery, UPS power supply, dc switchgear, dc panel, industrial control system.
No. 5
GEYA Single Phase Voltage Relay Adjustable Over or Under Voltage Protection Monitor Relay 1SPDT 10A...
- Controls its own supply voltage(True RMS measurement)
- User may select operation mode through knob
- Voltage measurement accuracy<1%
- Relay Status:Its working status is indicated by the LED indicator.
- Product Size:Ultra-small size, only 18mm width, 35mm rail mounting.
No. 6
Voltage Monitoring Relay Adjustable Over Under Voltage Protector with Delay Timer 35mm DIN Rail Mount for...
- 2 INDICATOR LIGHT: Action time of over-voltage relay can be adjusted, 2 sets of normally open and normally closed contacts, 2 indicator lights indicate various working conditions
- REAL-TIME MONITOR: The overvoltage undervoltage protector relay is convenient to use, real-time monitoring of dc overvoltage and undervoltage faults
- ADJUSTABLE: The overvoltage protector is not additional auxiliary power supply is required. Both over-voltage and under-voltage value can be adjusted
- RAIL MOUNT: The voltage monitoring relay made of meterial, with standard modular structure, rail type installation
- APPLICATION: The motor overvoltage protector can be used for dc motor, battery, UPS power supply, dc switchgear, dc panel, industrial control system
No. 7
Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control...
- 1>Screen display Current Measured Voltage Value automatically after power ON. Press SET button enter into set mode and the first bit will keep flashing. The first parameter set is the Upper Limit Voltage Value. Press ENTER button to set first bit value...
- 2>Then Then First Parameter ‘Upper Limit Voltage Value’ Has Been Set. Press SET Button At 4th Time To Set Next Parameter The Lower Limit Voltage Value In The Same Methods. Note: its value needs less than the Upper Limit Voltage Value. The third...
- 3>Its Set Range Is D-0 ~ D-9 Which Means After 1~9minute, The Screen Will Turn OFF. Note: d-0 means the screen will keen ON all the time. The 5th parameter is to set the Relay Triggering Status ‘ON H’ or ‘ON L’. ‘ON H’ : Relay output will turn...
- 4>ON L’ : Relay output will turn ON if the Current Measured Voltage Value is less than the Lower Limit Voltage Value. Relay output will turn OFF if the Current Measured Voltage Value is more than the Upper Limit Voltage Value.It can be applied to...
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No. 8
YWBL-WH 35MM Din Rail Voltage Monitoring Relay, DC 48V, Over-Voltage and Under-Voltage Protection, 6A 250VAC...
- REAL-TIME VOLTAGE MONITORING: Continuously monitors DC circuits for overvoltage and undervoltage faults with adjustable voltage thresholds (overvoltage: 13-17V, undervoltage: 10-14V) and action delay time from 0.1 to 15 seconds
- DUAL PROTECTION RELAY: Features 2 sets of normally open and normally closed contacts with 6A 250VAC capacity, designed for DC 48V rated voltage applications without requiring additional auxiliary power supply
- EASY DIN RAIL INSTALLATION: Standard modular structure with 35mm rail mounting for quick and simple installation, compact dimensions of 3.1 x 0.9 x 3.1 inches and weighs approximately 7.1 ounces
- LED STATUS INDICATORS: Equipped with 2 indicator lights that clearly display various working conditions including normal operation and fault action states for easy monitoring
- VERSATILE DC APPLICATIONS: Ideal for protecting DC motors, batteries, UPS power supplies, DC switchgear, DC panels, and industrial control systems from voltage fluctuations
SaleNo. 9
YWBL-WH Voltage Monitoring Relay Over-Voltage and Under-Voltage Relay 35MM Rail 13-17V 10-14V(DC12V)
- ✈ Product Name: Voltage Monitoring Relay; function: over voltage, under voltage; Rated voltage: DC 12V/24V/36V/48V; Overvoltage regulation range: 13-17v; Undervoltage adjustment range: 10-14v; capacity: 6A 250VAC (resistivity).
- ✈ Main Features: The voltage monitoring relay is of 2 sets of normally open and normally closed contacts, 2 indicator lights indicate various working conditions, no additional auxiliary power supply is required.
- ✈ Real Time Monitoring: The voltage monitoring relay could achieve real-time monitoring of dc overvoltage and undervoltage faults, and over-voltage, under-voltage value, and action time can be adjusted.
- ✈ 35mm Rail: With 35mm rail and standard modular structure, the voltage monitoring relay is easy to install, easy to operate.
- ✈ Typical Applications: The voltage monitoring relay is typically applied in dc motor, battery, UPS power supply, dc switchgear, dc panel, industrial control system.
No. 10
YWBL-WH SVR1000 Single Phase Voltage Monitoring Sequence Relay Over Voltage Under Voltage Protection Relay...
- Modular Design: Features a standardized modular structure for rail-type installation.
- Universal Voltage Detection: Automatically identifies AC/DC voltage with no need to manually switch.
- Comprehensive Display: Utilizes a built-in LCD screen to display voltage values, fault statuses, and setting parameters in Chinese.
- Advanced Monitoring: Monitors for single-phase over-voltage and under-voltage faults in real time.
- Self-Powered: Requires no additional auxiliary power source.
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Last update on 2026-03-29 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Voltage Monitoring Relays
Key Factors When Choosing a Voltage Monitoring Relay
When selecting a voltage monitoring relay, consider the following essential factors to ensure optimal performance and protection for your equipment:- Voltage and Phase Requirements: Determine the operating voltage range your equipment requires. Relays are available for single-phase and three-phase systems. Ensure the relay's specifications match your power supply to prevent incompatibility issues.
- Protection Features: Look for relays that offer the specific protections needed for your application. Common features include overvoltage, undervoltage, phase loss, phase reversal, and voltage imbalance detection. Some advanced models may also offer adjustable delay times.
- Environmental Conditions and Durability: Consider the environment where the relay will be installed. Some relays are designed for industrial settings and feature robust construction to withstand dust, humidity, and temperature extremes. Check the operating temperature range and ingress protection (IP) rating if necessary.
Frequently Asked Questions
What is the primary function of a voltage monitoring relay?
A voltage monitoring relay's main job is to protect electrical equipment from damage caused by abnormal voltage conditions. It continuously monitors the incoming voltage and disconnects the load if it falls outside a safe, pre-set range.
What is the difference between single-phase and three-phase relays?
Single-phase relays are designed for standard household or light commercial power systems that use two wires (one power and one neutral). Three-phase relays are used in industrial and heavy commercial settings where power is supplied through three alternating currents, offering more stable and efficient power distribution.
How do I determine the correct voltage rating for a monitoring relay?
You need to match the relay's voltage rating to the operating voltage of the equipment it will protect and the power supply it's connected to. Consult your equipment's manual and your electrical panel specifications to find the correct voltage and phase configuration.
Can a voltage monitoring relay protect against power surges?
While some voltage monitoring relays offer overvoltage protection, they are primarily designed to manage steady-state voltage deviations rather than sudden, high-energy power surges. For surge protection, a dedicated surge protector or suppressor is typically recommended in conjunction with a voltage monitoring relay.