Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant's customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. As an Amazon Associate we may earn from qualifying purchases. We may receive a commission from purchases made through links on our site, which will help us continue to provide you with value.
Best Choice Domary 
Domary DC 6-80V Voltage Monitoring Relay, Time Delay Charging Discharge Controller Module with 4 Operating Modes, for Vo [Precise Voltage Detection] Equipped with a voltage detection channel and relay switch output for accurate monitoring anGEYA 
GEYA Voltage Monitoring Relay Phase Sequence and Phase Failure Protection Relay 1SPDT 10A(GRV8-03,AC127V-265V) Function Feature:Controls its own supply voltage(True RMS measurement).Best Value ECSiNG 
ECSiNG 2X 12V Low Voltage Disconnect Module YX-X0001 Battery Undervoltage Cut-Off Protection Board for Solar RV LED DIY Wide Compatibility: Works with 12V DC systems including solar setups, RVs, LED lighting, and DIY electronics.Badafaci 
Badafaci Voltage Detection Relay Module, PCB Material, Voltage Monitoring, 12V Control for Automotive and Home Appliance [Wide Voltage Monitoring]Monitors voltage from 0 to 99.9V with precision, ensuring accurate voltage levels for various aMarhynchus 
Marhynchus DC Overvoltage Undervoltage Protector, 12V 24V 36V 48V Adjustable Voltage Monitoring Relay for DC Motor Batte [Real-time Voltage Monitoring] Our advanced relay provides continuous monitoring of dc circuits, instantly detecting botGEYA 
GEYA Voltage Monitoring Relay Phase Sequence and Phase Failure Protection Relay 1SPDT 10A(GRV8-03,AC220V-460V) Function Feature:Controls its own supply voltage(True RMS measurement).AKLOSIPY 
AKLOSIPY DC Current Detection Module Relay Switch Sensor with Digital Display for Motor Control 7-30V 10A Control - This advanced DC current detection module features an intelligent relay switch that automatically connects andCocoarm Cocoarm Voltage Protector Relay, Self-Powered Overvoltage Undervoltage Protection, DC Real-Time Monitoring for Motors, U [Self-Powered Operation]No external power source required, directly draws from monitored circuit, simplifying installatiGAEYAELE GAEYAELE Three Phase Failure Phase Sequence Voltage Monitoring Relay Voltage Sensing Protection Relay AC220V-460V 10A 1S Function Feature:Controls its own supply voltage(True RMS measurement).Eacam Eacam Digital Relay Tester for Cars, 12V 24V Voltage Automotive Relay, 4 Pin 5 Pin Diagnostic Tool, with HD Screen, Safe [High-definition Digital Screen] Accurately displays 12v - 24v battery voltage in real-time for comprehensive electricalOmabeta DC 12V 24V 36V 48V Over Voltage Under Voltage Protection Relay with Standard Modular Structure, Real-time Monitoring 2 S Dual Sets: DC overvoltage undervoltage relay is equipped with 2 sets of normally open and normally closed contacts for vGAEYAELE GAEYAELE Voltage Monitoring Relay Phase Sequence and Phase Failure Protection Relay AC127V-265V 10A 1SPDT(GRV8-03,M265) Function Feature:Controls its own supply voltage(True RMS measurement).GEYA GEYA 3 Phase Failure Phase Sequence Voltage Monitoring Relay Voltage Sensing Protection Relay 1SPDT 10A(GRV8-06,AC220V-4 Function Feature:Controls its own supply voltage(True RMS measurement).ViaGasaFamido Car Relay Tester 12V 24V, Digital Battery Voltage Analyzer for 4 Pin 5 Pin Relays, Automotive Electrical Diagnostic Tool [Safe Testing]Insulated silicone alligator clips prevent electric leakage, ensuring user safety during the testing proceGAEYAELE GAEYAELE Voltage Protection Relay AC220V Over-Voltage and Under-Voltage Monitoring Relay(GRV8-02,A220) Controls its own supply voltage (True RMS measurement).Hyuduo Hyuduo GRV8-03 Voltage Monitoring Relay, Adjustable Settings, Phase Sequence Protection, LED Indicator for Industrial Eq [Voltage Monitoring Efficiency]Monitors three-phase voltage effectively, ensuring safety for industrial equipment againsHyuduo Hyuduo Voltage Protective Device, Phase Failure Voltage Imbalance Relay 380VAC, Industrial Equipment, Power Monitoring, [High Performance] Insulating copper wire with a carrying area of 1.0-2.5mm ensures secure and connection.Barbuly Barbuly GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay SENECESLI SENECESLI Voltage Relay Module with Industrial Circuit Guard for Stable Performance in Power Systems [PRECISE VOLTAGE DISPLAY] Accurate monitoring from 0-99.9V with initial accuracy at 0.1V, ideal for DC24V operations.GEYA GEYA Single Phase Voltage Relay Adjustable Over or Under Voltage Protection Monitor Relay 1SPDT 10A (GRV8-01,AC/DC110V-2 Controls its own supply voltage(True RMS measurement)Spacnana Spacnana GRV8-03 Monitoring Relay, Voltage Monitoring, Phase Sequence Protection, Adjustable Settings for Mobile Device [Voltage Protection]Designed to monitor three-phase voltage levels, providing under and over voltage protection to yourSpacnana Spacnana JVRD6, JVRD6 Three Phase Power Monitoring Relay Phase Sequence Protector Control Device, Voltage Monitoring Rel Features: Standard modular construction, rail mounted. Real-time monitoring of three-phase phase failure and phase lossMarhynchus Marhynchus DC 12V Voltage Detection Relay Module Voltage Monitoring Relay 0-99.9V with LED Display Upper Lower Limit Det [Reliable Equipment Protection] By rapidly detecting abnormal voltage levels in specific low-voltage ranges and triggeriEMSea EMSea 10pcs DC0-25V Voltage Detection Module Voltage Sensor Suitable For Power Monitoring Automation Control Data Collec Use this product to measure voltage and current, making it ideal for DIY electronic design projects.LIYJTK Voltage Monitoring Relay Protective Phase Protection for Elevators and Refrigerated Trucks M265 [MONITOR OWN VOLTAGE]: Ensures accurate true RMS measurement of working voltage.Adfaga Adfaga GRV8 03 Three Phase Voltage Monitoring Relay Adjustable Voltage Protection LED Indicator Compact Design for Indus [PRECISE VOLTAGE MONITORING] The GRV8 03 Three Phase Voltage Monitoring Relay continuously tracks working voltage with eYsyaxsyt Ysyaxsyt Overvoltage Undervoltage Protector Voltage Monitoring Relay Undervoltage Protector DC Protection Relay DC24V Both over - voltage and under - voltage value can be adjustedJxngery Jxngery GRV8-04 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection M265 This relay can monitor own working voltage (true RMS measurement).CUOFYUNL CUOFYUNL GRV8-04 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection M460 This relay can monitor own working voltage (true RMS measurement).Badafaci Badafaci 3-Phase Monitoring Relay 208-480VAC Current Voltage Monitoring Relay Phase Sequence Protector DPA51CM44 3-Phase monitoring relay features strong anti-interference performanceCUOFYUNL CUOFYUNL GRV8-05 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection M265 This relay can monitor own working voltage (true RMS measurement).Xiuganpo Xiuganpo 3-Phase Voltage Monitoring Relay with Accurate Voltage Measurement for Equipment Protection and Control, Mounta [TRUE RMS VOLTAGE MONITORING] ensures accurate measurement for equipment protection and controlPIOGHAX 240V Plug Power Meter Electricity Usage Monitor,PIOGHAX Energy Watt Voltage Amps Meter with Backlit Digital LCD, Overloa 【Backlit Digital LCD Display】The plug-in power meter is designed to be extremely user-friendly, with a large, clear backHyuduo Hyuduo 3 Phase Voltage Monitoring Relay DIN Rail Mount with True RMS Measurement LED Indicators for Industrial Equipment [True RMS Measurement]Accurate voltage monitoring with true RMS technology for precise readings in industrial environmenGeneric DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage Protect ⚽Operating power is DC 6 to 80V, contact load is 30A, 250V AC or 30V DC. voltage monitoring relay is durable, and featurYctze Yctze 3-Phase Voltage Monitoring Relay with Accurate Measurement LED Indicators for Equipment Protection and Control 1 P [TRUE RMS MEASUREMENT] This relay can monitor its own working voltage accurately with a measurement error of less than 1MEIJUN RAYWE DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage P 🔔[Operating power is DC 6 to 80V, contact load is 30A, 250V AC or 30V DC. High quality voltage monitoring relay is duraBassulouda GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay 3. Voltage measurement accuracy is not more than 1%.YaSao YaSao DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage P 💌[Operating power is DC 6 to 80V, contact load is 30A, 250V AC or 30V DC. High quality voltage monitoring relay is duraSorandy Sorandy GRV8-04 3-Phase Voltage Monitoring Relay Adjustable Voltage Control with Phase Failure Protection for Refrigerat [PRECISE VOLTAGE MEASUREMENT] Voltage measurement accuracy within 1% ensures reliable operation.Hyuduo Hyuduo Phase Sequence Protection Relay JVR800-2, 3 Phase Voltage Monitoring Relay with Over Under Voltage Protector for [Multi-Voltage Protection] Monitors over-voltage, under-voltage, phase loss, and phase sequence for 208-480V AC systemsFUNFANG DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage Protect 📍Operating power is DC 6 to 80V, contact load is 30A, 250V AC or 30V DC. voltage monitoring relay is durable, and featuALKOY DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage Protect ♠[Operating power is DC 6 to 80V, contact load is 30A, 220V AC or 30V DC. High quality voltage monitoring relay is durabKaifucy Kaifucy GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay 2. 8 kinds of adjustable rated voltage.SPACTZ SPACTZ DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage Can be used in voltage monitoring, charging and discharging control, overvoltage and undervoltage protection and other fHaofy Haofy GRV8-03 Three Phase Voltage Monitoring Relay with Adjustable Rated Voltages for Worldwide Application (M460) [WIDE VOLTAGE RANGE] Measuring range from 176V to 552V for comprehensive monitoringpupoioi GRV8 04 3 Phase Voltage Monitoring Relay True RMS Measurement 8 Adjustable Rated Voltages Phase Sequence Phase Failure P [TRUE RMS VOLTAGE MONITORING] This advanced 3-phase voltage monitoring relay provides precise true RMS measurement of yoMarhynchus Marhynchus 3 Phase Voltage Monitoring Relay, Voltage Protection Device, Under Over Protector, Rated 208-480V AC for Indu [Voltage Protection]Monitors over-voltage, under-voltage, phase loss, and sequence, ensuring safe operation of machineryDiewu Diewu DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge ler Module Undervoltage Overvoltage Protecti Operating power is DC 6 to 80V, contact load is 30A, 250V AC or 30V DC. High quali voltage monitoring relay is durable,ZEYUAN ZEYUAN DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage Operating power is DC 6 to 80V, contact load is 30A, 250V AC or 30V DC. High quality voltage monitoring relay is durablekeppy keppy DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage P Operating power is DC 6 to 80V, contact load is 30A, 250V AC or 30V DC. High quality voltage monitoring relay is durableTIKATARER TIKATARER 3-Phase Voltage Monitoring Relay Efficient Phase Failure Protection for Equipment Protection Industrial Applic [HIGHLY ACCURATE VOLTAGE MONITORING] Monitor working voltage with 1% accuracy and 8 adjustable levels for precise protecNDNCZDHC Voltage Monitoring Relay, GRV8-02 Single-Phase Voltage Control Monitoring Relay Voltage Protector Relay for Electrical E Compact and Easy Installation: Voltage monitoring relays is designed with a compact size, measuring only 18mm in width.Tuperoymse Tuperoymse GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay 3. Voltage measurement accuracy is not more than 1%.NDNCZDHC Voltage Monitoring Relay, GRV8-02 Single-Phase Voltage Control Monitoring Relay Voltage Protector Relay for Electrical E Compact and Easy Installation: Voltage monitoring relays is designed with a compact size, measuring only 18mm in width.Hyuduo Hyuduo Phase Sequence Protection Relay 3 Phase LCD Display Voltage Monitoring Relay for Motor Pump Air Compressor Over U [Real-Time Voltage Monitoring] LCD display shows real-time voltage values and fault status for quick troubleshooting andOdorkle Odorkle Voltage Monitoring Relay 3 Phase Protective Device with True RMS Measurement 8 Adjustable Voltages for Elevators [True RMS Measurement] Accurately monitors working voltage with true RMS measurement for reliable performance in variousBBZY DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage Protect 👍Operating power is DC 6 to 80V, contact load is 30A, 220V AC or 30V DC. High quality voltage monitoring relay is durabKaifucy Kaifucy GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay 4. Relay working status is indicated by LED indicators.Fafeicy Fafeicy Monitoring Relay GRV8-04 Voltage Monitoring Relay, Voltage Control 3-Phase, Adjustable High Exactness with LED I DIN rail mounted: With super small volume, this relay can be mounted on 35mm DIN rail.Fafeicy Fafeicy Monitoring Relay GRV8-04 Voltage Monitoring Relay, Voltage Control 3-Phase, Adjustable High Exactness with LED I DIN rail mounted: With super small volume, this relay can be mounted on 35mm DIN rail.TIKATARER TIKATARER GRV8-04 3-Phase Voltage Monitoring Relay High Accuracy Protective Relay for Normal/Emergency Power Supply Swit [PRECISE VOLTAGE CONTROL] Monitors own working voltage with true RMS measurement for ultimate accuracy and safety.YDuupxe YDuupxe Voltage Protect Relay 3 Voltage Monitoring Relay Control Phase Monitoring 35mm Guide Rail [Adjustable rated voltage] Voltage Protect Relay offers 8 kinds of adjustable rated voltage options.Jeffergarden Jeffergarden Delay Relay Controller Module, PCB Material, Wide Voltage Detection Range 0-99.9V, Automatic Control for DC Wide Voltage Range: Monitors voltages from 0-99.9V with 0.1V accuracy, ideal for various low voltage applications.Spacnana Spacnana 3 Phase Voltage Monitoring Relay, JVR800-2 Voltage Protection Device for Over Under, LCD Display for Industrial [Comprehensive Protection]Monitors over and under voltage, ensuring optimal performance of industrial equipment with resViaGasaFamido ViaGasaFamido Phase Failure Protection, Voltage Monitoring Relay with LCD Display for Over-Voltage and Under- Protection [Real-time Monitoring] Built-in LCD display shows voltage levels, error status and parameter settings for instant analysHaofy Haofy Voltage Monitoring Relay Over Under Voltage Protector Powered by Measuring Circuit [RELIABLE PROTECTION] Guards against three-phase overvoltage, undervoltage, phase error, and phase loss faults. EnsuresRelogic Relogic DC 6~80V Voltage Monitoring Relay Time Delay Relay Charging Discharge Controller Module Undervoltage Overvoltage Operating power is DC 6 to 80V, contact load is 30A, 250V AC or 30V DC. High quality voltage monitoring relay is High quKUNLONGSKY Overvoltage Undervoltage Protector Voltage Monitoring Relay Undervoltage Protector DC Protection Relay DC24V Real-time monitoring of dc overvoltage and undervoltage faults; Action time can be adjustedTomvorks 3 Phase Voltage Monitoring Relay for Equipment Tower Crane Elevator, DIN Rail Mount [Led Indicators] Relay working status conveniently indicated by led indicators.Lrocaoai 3X GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay 3. Voltage measurement accuracy is not more than 1%.SVRITE SVRITE GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay Mingzhe 3-Phase Voltage Monitoring Relay with LED Indicators 8 Adjustable Rated Voltage for Tower Crane Elevator [Compact Design] Super small volume allows convenient mounting on 35mm din rail for space-saving installation.Voniecop Voniecop 2X GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay 3. Voltage measurement accuracy is not more than 1%.Spacnana Spacnana Phase Loss Protector, Voltage Monitoring Relay with LCD Display for Motor and Industrial Applications, Adjustab [Real-Time Monitoring] Continuously tracks overvoltage, undervoltage, phase error, and loss, ensuring optimal operationJeffergarden Jeffergarden Voltage Monitoring Relay, Overvoltage Undervoltage Protector, Adjustable DC Relay for Motor and Battery Pro Real-Time Monitoring: Continuously checks for overvoltage and undervoltage faults, enhancing operational reliability.Morelian Morelian Protective Relay, Voltage Monitoring Relay 3-Phase for Equipment Protection and Control, Super Small Volume on [Led Indicator Status] Easily determine the working status of the relay with led indicators, providing clear visual feedGrcfumo 3 Phase Voltage Protector Relay, Voltage Monitoring Relay, Voltage Control Relay GRV8-04 M460 CLEAR STATUS INDICATION: The relay includes LED indicators to clearly display its working status. This visual feedback sLrocaoai 2X GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay 2. 8 kinds of adjustable rated voltage.Marhynchus Marhynchus 440VAC Voltage Relay Phase Sequence Protector with Rail Type Installation for Electric Motors and Industrial [Voltage Monitoring] Continuously safeguards equipment by ensuring normal working voltage is maintained.Marhynchus Marhynchus 440VAC Voltage Relay Phase Sequence Protector with Rail Type Installation for Electric Motors and Industrial [Voltage Monitoring] Continuously safeguards equipment by ensuring normal working voltage is maintained.Daiilg Daiilg Overvoltage Undervoltage Protector Voltage Monitoring Relay Undervoltage Protector DC Protection Relay DC24V No additional auxiliary power supply is required; Typical applications: dc motor, battery,UPS power supply, dc switchgeaRIZGHWOY RIZGHWOY Voltage Monitoring Relay Small Size LED Indicator with Adjustable Rated Voltages for Power Load Protection (M46 [CUSTOMIZABLE VOLTAGE SETTINGS]: Choose from 8 different voltage options to suit your specific needs and regional requirNutriEss Nutriess DVRD Over Voltage and Under Voltage Monitoring Relay DC 48V Adjustable Voltage System for Motors and Circuitry Reliability: Offers real-time monitocircle of over-voltage and under-voltage conditions, delivecircle consistent AccuracByttlerom Byttlerom Overvoltage Undervoltage Protector Voltage Monitoring Relay Undervoltage Protector DC Protection Relay DC24V Standard modular structure, guide rail type installationFuchooky GRV8 04 3 Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection M460 Product Application：This relay can monitor own working voltage (true RMS measurement).Mellisso Mellisso Overvoltage Undervoltage Protector Voltage Monitoring Relay Undervoltage Protector DC Protection Relay DC24V No additional auxiliary power supply is required; Typical applications: dc motor, battery,UPS power supply, dc switchgeaLIYJTK JVR 384 Voltage Monitoring Relay Circuit Protection Relay for Air Compressors Water Pumps Electric Control Boxes [WIDELY USED IN VARIOUS INDUSTRIAL EQUIPMENT] Widely applied in air compressors, electric motors, and moreJelquix Jelquix Phase Sequence Protection Under Over Voltage Relay for 3 Phase Monitoring, LCD Display for Easy Reading, 1 X 3 V [HASSLE-FREE VOLTAGE PROTECTION] Protects against over-voltage, under-voltage, phase loss, sequence issues, and unbalancJectse Jectse 3 Phase Voltage Monitoring Relay,101V-318V 35MM DIN Rail Mount Phase Sequence Protective Relay,M265 Adjustable Vo This relay can monitor own working voltage (true RMS measurement).KUNLONGSKY 2X Overvoltage Undervoltage Protector Voltage Monitoring Relay Undervoltage Protector DC Protection Relay DC24V Standard modular structure, guide rail type installationGeneric 3-Phase Voltage Monitoring Relay Phase Sequence M460 Equipment Tower Crane Elevator [ Features] Protects equipment from reverse running, offers normal/emergency power supply switch, and safeguards againstXTevu LCD Voltage Monitoring Relay, 3 Phase 4 Wire Over Under Voltage Protector Monitor Relay Voltage Phase Sequence Protector Protection Function: Can monitor 3 phase overvoltage, undervoltage, voltage unbalance, phase misalignment, phase loss faMarhynchus Marhynchus Optocoupler Isolation Relay Module, High Level Actuator 3 Channel Relay Module with Optocoupler Isolation, DC [Independent Control] This 3 channel relay module ensures independent control without interference, for home automationDZS Elec DZS Elec 5V-30V 1 Channel Wilde Voltage 0-24s Adjustable Delay Internal/External Trigger Relay Board with Timer Delay Co Can adjust 0-24 seconds delay time with potentiometer, which is convenient to complete.Hundnsney Hundnsney GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection Voltage Control Relay IHJEDJVA GRV8-10 Din Rail 3 Phase Voltage Monitoring Relay with Reset Time 0.1s-10s Voltage Relay 36mm Width(GRV8-10 M265) RelaysZenithAur ZenithAur Voltage Monitoring Relay DC 12V / 24V / 36V / 48V Adjustable Voltage Relay Over - Voltage and Under - Voltage Reliable Voltage Regulation: This voltage monitoring relay effectively manages overvoltage and undervoltage conditions,TOPINCN TOPINCN Ultra-Small Size Voltage Monitoring Relay with 8 Adjustable Rated Voltages for Safety Control (M460) [ADJUSTABLE VOLTAGE SETTINGS]: Customize the relay with 8 voltage options to suit your specific requirements, ensuring cBGFIVKAD 1pc GRV8-06 3 Phase Failure Phase Sequence Voltage Monitoring Relay Voltage Detection Protection Relay 460V (GRV8-06D M2 Switches & Relays