12 best voltage monitoring relays

Product description

Specification:

Function

Voltage monitoring

Power terminal (monitoring terminal)

A1(+)-A2(-)

Rated power supply voltage (Optional)

#1: AC220V

#2: DC12V

#3: AC/DC24V-4

#4: AC/DC110V-240V

Rated power frequency

50/60Hz

Rated insulation voltage

460V

Hysteresis value

3% fixed

Power indicator

Green LED

Output relay indication

Red LED

Action delay time

0.1s-10s, 10%

Voltage measurement error

≤1%

Power-on delay time

0.5s

Knob setting accuracy

1%

Reset time

1s

Temperature fluctuation error

0.05%/°C, at=20°C

Output

1 * SPDT

10A/AC1

250VAC

Minimum switching power

500mW

Mechanical life

1 * 10000000

Electrical life (resistance load)

1 * 1000000

Working environment temperature

-20°C- +55°C

Storage and transportation ambient temperature

-35°C- +75°C

Installation method

35mm rail installation

Protection level

IP20

Installation location

Any

Installation altitude

≤2000m

Pollution degree

2

Wiring ability

1 * 2.5mm2 or 2 * 1.5mm2

Dimensions

90mm * 18mm * 64mm / 3.5 * 0.7 * 2.5in (Approx.)

Standard

GB14048.5,

IEC/EN 60225-1



Package list:

1 * Relay

1 * User manual

• Monitor the working voltage (true RMS measurement).
• The operating mode can be selected via the rotary knob.
• High accuracy, voltage measurement accuracy is ≦ 1%.
• The working status of the relay is indicated by the LED indicator, which is simple and convenient.
• Compact size, only 18mm width, 35mm rail mounting.

Product description

Features:

Standard modular structure, guide rail type installation Real-time monitoring of dc overvoltage and undervoltage faults No additional auxiliary power supply is required Both over  - voltage and under - voltage value can be adjusted Action time can be adjusted 2 sets of normally open and normally closed contacts 2 indicator lights indicate various working conditions Typical applications: dc motor, battery,UPS power supply, dc switchgear, dc panel, industrial control system



Specification:

Protection function: over voltage, under voltage

Model: DVRD - 12/24/36/48(Optional)

Rated voltage: DC 12V/24V/36V/48V(Optional)

Monitoring circuit: direct current circuit

Protection function: over voltage, under voltage

Overvoltage regulation range: 13-17v

Undervoltage adjustment range: 10-14v

Action delay range: 0.1-15s

Display mode: normal, action 2 LED lights indicate the working status

Contact form: 2 set of normally open and normally closed contacts

Contact capacity: 6A 250VAC (resistivity)

Installation: 35mm guide rail

Overall dimension: 79 × 23 × 79mm / 3.1 × 0.9 × 3.1in

Weight: 200 g / 7.1 oz(approx.)



Package list:

1 × Overvoltage Undervoltage Protector

• ✈ PRODUCT NAME---Voltage Monitoring Relay; Protection function: over voltage, under voltage; Rated voltage: DC 12V/24V/36V/48V; Overvoltage regulation range: 13-17v; Undervoltage adjustment range: 10-14v; Contact 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 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
• ✈ 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

User questions & answers

Question:	Does this auto-reset itself or do I have to manually reset it
Answer:	Hi~Nice day! The voltage monitoring relay is of auto-reset, and you don't have to manually reset it. Hope this could help you, and thank you for your support.
Question:	will this cut off power at preset overvoltage and restart at preset undervoltage? In other words can I set it up to stop at 28v and restart at 24v
Answer:	It probably works like the 12 V unit I have. The short answer is No. You get two single pole double throw switches, but they both work in tandem, and they both actuate at the high setting and they both actuate at the low setting. So when they actuate all you know is that your batteries have reached the high setting, or they have reached the low setting. Not what I expected, Not what you want.
Question:	I plan to use one for a 60v battery and inverter. Can it handle the battery discharging at 80 amps
Answer:	Look at the specs. The contacts are rated at 6 amps maximum. 80 amps will destroy the contacts on the switches I can guarantee you because I have destroyed a couple of these devices with much lower amperage than 80 amps. The ONLY kind of "relay" that will handle 80 amps is a "solenoid". Ordinary relays will not handle that kind of current load. I just bought one od these to switch on and off a 120v AC power supply providing 12V DC to a solenoid which will drop the power to my inverter when the batteries are under voltage. I also am using a relay to drop the AC load at the same time to protect the solenoid.
Question:	How much current does the 12v monitor draw from the 12v supply
Answer:	None

Product description

Features:

1. Standard modular structure, guide rail type installation.

2. Ac/dc voltage universal, automatic identification of ac/dc voltage, no need to switch.

3. Built-in LCD Chinese display voltage value, fault status, setting parameters.

4. Real-time monitoring of single phase over-voltage and under-voltage fault.

5. No additional auxiliary power supply is required.

6. Over-voltage value and action time can be adjusted.

7. 3 Reset modes: manual, automatic, automatic with power-on delay.

8. Fault recording function.

9. Output test function.

10. 1 CO & 1NC contacts, over-voltage and under-voltage protection.

Specification:

Model: SVR1000/AD48

Optional Type: D12, AD48, AD220

Monitoring Circuit: L(+),N(-)

Rated Voltage: AC/DC 24V-48V 50/60Hz

Protection Function: Over-voltage, Under-voltage

Over-voltage Adjustment Range: AC/DC 20V-80V,OFF

Under-voltage Adjustment Range: AC/DC 0.1V-30V

Over-voltage / Under-voltage Action Range: 0.1-999s

Reset Mode: manual, automatic, automatic with power-on delay

Reset Time: 0.1-999s

Display: Chinese LCD

Contact Form: 1 CO & 1NC

Contact Capacity: 6A 250VAC

Size: Approx. 80*43*54mm/3.1*1.7*2.1in

Installation: 35mm Guide Rail

Typical Application Scope: electric motor, blower, water pump, air compressor, crane, travelling crane, lifter, elevator, machine tool, central air-conditioning, refrigeration equipment, laser equipment, industrial control system

Package List:

1 * Over-voltage Under-voltage Relay

• ★★★★★Standard modular structure, guide rail type installation.
• ★★★★★Ac/dc voltage universal, automatic identification of ac/dc voltage, no need to switch.
• ★★★★★Built-in LCD Chinese display voltage value, fault status, setting parameters.
• ★★★★★Real-time monitoring of single phase over-voltage and under-voltage fault.
• ★★★★★No additional auxiliary power supply is required.

Product description

The new 3UG4 line monitoring relays permit a maximum degree of protection to be achieved for machines, plants and systems. This means that line and voltage faults can be detected early on and the appropriate response is initiated before far more significant subsequent damage can occur.. Thanks to the wide voltage range, it can be used on all line supplies around the world – from 160 V to 690 V – without an auxiliary voltage. Can be variably set to above range, below range or window monitoring. Freely parameterizable delay times and reset behavior. Reduced width for all versions for line and voltage monitoring. For the digital versions, the actual value and fault type are permanently displayed. Automatic direction of rotation correction by differentiating between line faults and incorrect phase sequence. All versions have removable terminals. All versions have either screw terminals or alternatively innovative Cage Clamp terminals

• Product Type:Electronic Component
• Item Package Dimension:10.414 Centimeters L X 9.144 Centimeters W X 3.048 Centimeters H
• Country Of Origin: United States
• Item Package Weight:0.25 Pounds

Product description

User manual download link:

https://www.amazon.com/clouddrive/share/56TsVN32wK4n5fdWZ1fSwyy2P6uURyK6I99IfJVuY92



Operating voltage: DC 12V (nominal voltage should not exceed +/- 10%).

Current: less than 12V, 50mA (relay action not less than 12mA, turn off the display less than 3mA).

Operating temperature: Recommended -20 ℃ -60 ℃ (the limits of -30 ℃ -70 ℃).

Measuring range: 0-99.9V.

load capacity:

Normally open relay port maximum load capacity: DC 0-30V / 10A, AC 0-250V / 10A;

Relay NC port maximum load capacity: DC 0-28V / 10A, AC 0-125V / 10A.



Module interface:

Module voltage inputs: a 4-wire interface, all the terminals are the interface, user-friendly;

1, DC +: DC power positive;

2, DC-: DC power supply negative;

3, V +: measuring voltage positive electrode;

4, V-: measure negative voltage.



Function Module：

The user can select from the following five kinds of functions in one, you can set and save function parameters are automatically saved parameter set, power-down is not lost.

Function1: Voltage measurement: this function is selected, the relay will not operate, digital display of the current measurement voltage.

Function 2: Charge monitoring: When the measured voltage falls below a preset voltage V1 and V2 in the lower one, relay, voltage V1 and V2 higher than the higher of a relay off.

Function3: Discharge Monitoring: When the measured voltage is higher than the preset voltage V1 and V2 higher one, relay, T1 and T2 voltage is lower than the lower one, the relay off.

Function 4: pull the interval: When measuring the voltage between V1 and V2 between, relay, the relay off other cases.

Function 5: interval outer pull: When the measured voltage falls below a preset voltage V1 and V2 in a lower or higher than the preset measuring a voltage higher voltages V1 and V2, the relay is energized; otherwise relay disconnect.

• DVB01 module is a versatile voltage monitoring controller, using industrial grade microcontroller as the main control unit, wide measurement range, high accuracy.
• Module carefully processed genuine quality components made of stable performance, it can be widely used in a variety of voltage measurement and control types of occasions. The controller 5 different preset function.
• Users can set the upper limit voltage and the lower voltage limit; measuring range of DC 0-100V, measuring accuracy +/- 0.1V.
• Increase automatic power saving feature, users can customize the settings; all set parameters can be automatically saved, set the content of non-volatile.
• User manual download link: https://www.amazon.com/clouddrive/share/56TsVN32wK4n5fdWZ1fSwyy2P6uURyK6I99IfJVuY92

User questions & answers

Question:	Can i use this to protect a lead acid battery from overdischarge
Answer:	I use this to keep my solar charged batteries from dropping below 12.5 volts. I programmed the relay to turn on when the voltage dropped below 12.5 volts and turn off when above 12.6 volts. I used a 12 volt ac transformer and full bridge rectifier to supply 1 amp of charging current.
Question:	can you apply a time delay to the low voltage cutoff? the directions are not clear
Answer:	The relay activate and relay deactivate have their own user selectable time delays.
Question:	over nominal would only be 13.2, my vehicle on a cold start charges in the 14v range. Will this unit be able to handle that much of an operating
Answer:	Yes. I've try 14.2 without problem

Product description

Specification:

Condition: 100% Brand new

Rated Voltage: 200-500VAC, 50/60Hz

Protection Function: Phase failure and phase sequence

Display Mode: LED Indicates working status

Contact form: Two sets of normally open normally closed contacts

Contact Capacity: 6A AC250V (resistive)

Installation Method: 35mm Rail or device

Size: Approx. 79 x 23 x 79mm / 3.1 x 0.9 x 3.1in



Package List:

1 x Protector



Warning:

This product is generally sampled on the power side of the three-phase power supply and must not be installed on the output side of the variable current.

• ✔【3 INDICATORS】The protector base adopts 35mm rail type or device type, and has two screw hole structures inside, which can be directly installed separately or HT35 rail. Indicated by three indicators: normal, phase loss(voltage three-phase unbalance), reverse phase
• ✔【PHASE LOSS PROTECTION】Phase loss protection means that when the protected line is in the running state or non-operating state, any phase failure occurs, and the delay is 2S
• ✔【REVERSE PHASE PROTECTION】Reverse phase protection, a protection measure to prevent L1, L2, L3 three-phase AC phase sequence from being connected incorrectly, delay 2S action
• ✔【VOLTAGE IMBALANCE PROTECTION】Voltage imbalance protection, which refers to a protective measure that will affect the safe operation of the line due to three-phase voltage imbalance
• ✔【IDEAL FOR】Widely used in air compressors, electric motors, distribution boxes, water pumps, oil pumps, central air conditioning units, etc

User questions & answers

Question:	How is the quality of this product
Answer:	The quality of this relay is very good and reliable.

• Function Features: Monitor operating circuit voltage (True RMS).
• The Principle Of Use: OV or UV trip at desired setpoint.
• Voltage Measurement: Voltage measurement accuracy<1%.
• Relay Status : Status is indicated by the LED indicators.
• Product Size: Ultra-small size, only 18mm width, 35mm din rail mounting.

User questions & answers

Question:	Does the relay auto reconnect after voltage normalize
Answer:	Yes, It does. I used it for voltage sensing on an Automatic Transfer Switch. So far it has been flawless.
Question:	Can this device protect from surges as well as brownouts in a residential application
Answer:	No. This is not what this is designed for. You need a high end whole house surge suppression.
Question:	How does the input voltage adjust to a lower 48v range
Answer:	No it will not... it’s not designed for that application
Question:	Can I use this relay to monitor grid power outages? For example, activate an alarm when my solar hybrid inverter losses grid power
Answer:	Yes...If the output of your inverter is 220-240VAC. It provides a Form C relay contact for the output.

Product features

GAEYAELE's product is simple to operate and connect to circuits, many functions to choose, cost is very reasonable.

GAEYAELE's product has many features, such as High capacity contacts, High breaking capacity, Multi-voltage, Multi-function, wide product range.

GAEYAELE's product has modernization, accuracy, reliability, 100% quality Control. Most customers are satisfied with GAEYAELE's product.

GAEYAELE's product also have comprehensive certificates, and GAEYAELE's factory specialize in low voltage products for the decade, GAEYAELE also win the patented invention.

Product description

Specification:

Model: JVR 800-2

Monitoring Circuit: L1, L2, L3

Rated voltage: 208-480V AC, 50/60Hz

Protection: over-voltage, under-voltage, voltage unbalance, phase loss, phase sequence, counter

Overvoltage setting range: 200-600V

Undervoltage setting range: 150-500V

Voltage hysteresis: 1-20V

Delay time for overvoltage and undervoltage: 0.1-30s

Voltage unbalance ratio: 1-50%

Voltage unbalance hysteresis: 1-10%

Voltage unbalance delay time: 0.1-30s

Delay time for phase loss: 0.1-30s

Delay time for phase sequence: 0.1-30s

Start delay time: 0-999s

Auto reset mode: ON/OFF

Auto reset time: 0.1-999s

Timer and counter input: AC/DC 80-450V

Indicators: LCD indicating voltage,current,operation status

Output contacts: 1 C/O,1NC

Contact capacity: 6A ,250VAC

Dimensions (H×W×D): 80×43×54mm/3.15×1.69×2.12inch

Mounting: suitable for 35mm rail

Weight: 129g



Package List:

1 × 3 Phase Voltage Monitoring Relay

• The Composition of This Product: Three-phase voltage protector, chronograph and counter are integrated in one relay.
• Function: This voltage protection relay has overvoltage, undervoltage, phase loss, phase sequence and unbalanced three-phase voltage protection.
• Practicality: This 3-phase voltage relay does not require an external power supply. Has practical functions: power delay, output test, etc
• 2 rest modules are optional, manual and automatic.
• The LCD can display data for easy reading.

User questions & answers

Question:	Can this product continually monitor voltage and phase issues and not reconnect power until voltage and phase issues have been corrected
Answer:	It's a relay--you can make it do what ever you want it to do.
Question:	I need the manual in English any help are welcome
Answer:	I emailed the vendor and he sent me a manual. I'll be glad to forward to you. I had an unresolved issue of getting the play unit to read out in english rather than chinese. The vendor told me they only had the chinese version (despite the photo and having english instructions!). I ended up using a different product.

Product description

Features:

DPA51CM44 3-Phase monitoring relay features strong anti-interference performance. Compact size and convenient for installation. Maintain constant and efficient work of the motor. Widely used in motor protection, elevator, air conditioning system, power system and other industries. 3-phase monitoring relay for phase sequence and phase loss. Detects when all phases are present and have the correct sequence.

Specifications:

Model: DPA51CM44

Contact load: 5A/ 250VAC; 5 A / 24 VDC

Rated current: 5A

Rated voltage: 208-480VAC

Protective features: IP20

3C rated voltage range: below 36V

Measuring range: 208-480VAC

Contact switching voltage: 250V

Contact switching current: 5A

Output: 1*SPDT relay

Maximum load capacity: 5A/250VAC, 5 A / 24 VDC

Electrical life: > 100,000 times

Size: 8.1 x 6.7 x 1.75cm/3.1 x 2.6 x 0.6inch

Package Included:

1 x 3-Phase Monitoring Relay

• Small Size: This 3-Phase Monitoring Relay has a small compact size for easy and convenient use and install, and the size of the Monitoring Relay is 8.1 x 6.7 x 1.75 cm/3.1 x 2.6 x 0.6 inch, you can install it on any places around the room, saving a lot of place
• Multi-functioanl: This DPA51CM44 3-Phase Monitoring Relay has a widely use on the electric filed, and it can be applied to motor protection, elevator, air conditioning system, power system and other industries, very helpful tool during daily life
• Work Well: DPA51CM44 3-Phase Monitoring Relay features with strong anti-interference performance, so it helps maintain a constant and efficient work of the motor, it will provide an excellent performance during the working process
• 3-Phase Design: This Current Monitoring Relay is designed with 3-Phase Monitoring Relay to provide a correct phase sequence, without neutral, phase Loss and Incorrect phase sequence, so it can detect when all phases are present and have the correct sequence
• LED Indication: This DPA51CM44 Monitoring Relay features an LED indication for easier installation and trouble shooting, which permits a maximum degree of protection to be achieved for machines, plants and systems, and avoid far more significant subsequent damage, very convenient and useful

User questions & answers

Question:	Amp rating of 5, Is this referring to the control voltage? In other words the amperage to the coil on the contactor
Answer:	Contact load: 5A/ 250VAC; 5 A / 24 VDC Contact switching current: 5A Maximum load capacity: 5A/250VAC, 5 A / 24 VDC

Product description

TE CONNECTIVITY / POTTER & BRUMFIELD CSL-38-60010 VOLTAGE MONITORING RELAY, DPDT, 150VDC

Product description

Specification:

Function: Monitor L-L voltage (3-phase 3-wire system)

Monitoring terminal: L1-L2-L3

Power: L1-L2

Rated working voltage: 220-230-240-380-400-415-440-460(P-P) 

Rated power frequency: 45Hz-65Hz

Measuring range: 176V-552V 

Voltage threshold range: 2%-20% (rated voltage)

Voltage fixed lag rate: 2%

Voltage measurement error: ≤1%

Power-on delay time: 0.5s

Knob setting accuracy: 10%

Reset time: 1s

Temperature fluctuation error: 0.05%/°C, at=20°C

Output: 1 × SPDT; 10A/ AC1; 250VAC/24VDC

Minimum switching power: 500mW

Overvoltage: 2%-20%

Undervoltage: -20%-2%

Action delay time: 0.1-10s adjustable

Phase sequence protection: Yes

Phase failure protection: Yes

Power indicator: Green LED

Output relay indication: Red LED

Mechanical life: 1×107

Mounting method: 35mm DIN rail mounting

Mount altitude: ≤2000m

Weight: Approx. 78g/2.7oz



Package list:

1 ×  Voltage Monitoring Relay

• Convenient Monitoring: The voltage relay can monitor its own operating voltage (true rms measurement).
• High Accuracy: The voltage relay has 8 adjustable rated voltages, and the voltage measurement accuracy is less than 1%.
• Application: Equipment protection and control (tower cranes, elevators, agricultural equipment, refrigerated trucks); prevent reverse operation of equipment; normal/emergency power switch; prevent phase failure of dynamic loads.
• LED Indicator: The working status of the voltage control relay is indicated by the LED indicator.
• Small Size and Easy to Install: The voltage protection relay is ultra-small and can be mounted on a 35mm DIN rail.

Product description

Keenso-- JVRD-380W Adjustable Circuit Voltage Protector Three Phase Over Under Voltage Monitoring Relay. Used in electric motors, fans, water pumps, air compressors, cranes, driving, lifts, elevators, machine tools, central air conditioners, refrigeration equipment, industrial control systems, etc. Great choice for you!



Specification:

Model: JVRD-380W 

Detection circuit: L1, L2, L3, N

Rated voltage: 380VAC 50/60Hz

Overvoltage setting: 399-456VAC

Undervoltage setting: 304-361VAC

Protection function: Overvoltage, undervoltage, phase error, phase loss, voltage imbalance, neutral line disconnection

Voltage setting range: ±5%- ±20%

Display mode: Overvoltage, undervoltage, phase error, phase loss, normal

5 LED lights indicate working status

Contact form: 1 set of normally closed contacts + 1 set of conversion contacts

Contact Capacity: 250V/AC 6A

Rated current: 3 (A)

Installation method: 35mm rail



Package list:

1 * Voltage Protector



Note:

1. When you first connect the product, you have to wait about 1 minute, after the red light turn off, then the product will work.

2. The actual product color may deviate from the photo due to light.

3. There may be a slight deviation in the measurement of product



WE SELLER HAS TO SAY:

We Geeriu are The Original Owner And Registrant Of “Keenso".  As an reliable seller, we promise that 100% money refund about damaged product during delivery. We are committed to provide the best customer services to our customers. If you have any questions, just contact us and we will give you the most satisfactory solution, buy with confidence in Geeriu!

• ☆[ ADJUSTABLE VOLTAGE VALUE ]-- The overvoltage and undervoltage value is independently adjustable and the action time is adjustable. 2 sets of normally open normally closed contacts, 5 indicators indicate various working conditions
• ☆[ MULTIPLE PROTECTION ]-- This voltage protector relay has Overvoltage, undervoltage, phase error, phase loss, voltage imbalance and other protection functions, zero line disconnection fault monitoring function
• ☆[ WIDELY APPLICATION ]-- Used in electric motors, fans, water pumps, air compressors, cranes, driving, lifts, elevators, machine tools, central air conditioners, refrigeration equipment, industrial control systems, etc
• ☆[ 35MM RAIL MOUNTED ]-- Circuit Over Under Voltage Monitoring Relay, tandard modular construction, rail mounted, no additional auxiliary power required
• ☆[ KEENSO SERVICE GUARANTEE ]-- Professional, premium aftermarket replacement. In terms of any problem of this product, you can send emails as soon. Keenso will provide you excellent customer service and 100% satisfaction warranty. BUY WITH CONFIDENCE in Geeriu!