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Best Phase Monitoring Relays - Buying Guide

Last Updated: 10/16/2019

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Bestselling Phase Monitoring Relays on Amazon

  1. SVR1000 Single Phase Protection Relay Over-Voltage 50V-300V Under-Voltage 1V-90V AC/DC(AD220)
  2. Siemens 3UG4512-1AR20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  3. Supco APR5 Wire to Wire Adjustable Potential Relay, 30 A Load Current, 110 - 270 VAC Single Phase Op...
  4. Voltage Monitoring Relay DC 12V/24V/36V/48V Over-Voltage and Under-Voltage Protection Relay 35MM Gui...
  5. ATC SLA-440-ALE Monitor/Relay, 430-480 Adjustable, Lock Shaft Adjusted, Surface Mounted, 8 Screw Ter...
  6. Siemens 3UG4511-1BP20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  7. Siemens 3UG4616-1CR20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  8. Voltage Monitoring Relay DC 12V/24V/36V/48V Over-Voltage and Under-Voltage Protection Relay 35MM Gui...
  9. Voltage Monitoring Relay DC 12V/24V/36V/48V Over-Voltage and Under-Voltage Protection Relay 35MM Gui...
  10. Siemens 3UG4513-1BR20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...

  #1

SVR1000 Single Phase Protection Relay Over-Voltage 50V-300V Under-Voltage 1V-90V AC/DC(AD220)

 Ean: 0703633820945   |    PartNumber: shgbwqe94u-03   |   Asin: B07PZD9WSL

Over-voltage value and action time can be adjusted. 3 Reset modes: manual, automatic, automatic with power-on delay. Fault recording function. Output test function. 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 110V-240V 50/60Hz
Protection Function: Over-voltage, Under-voltage
Over-voltage Adjustment Range: AC/DC 50V-300V,OFF
Under-voltage Adjustment Range: AC/DC 1V-90V
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


Features

  • 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.
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Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Package Dimensions: 1.8 x 2.5 x 3.5 inches (4.6 x 6.4 x 8.9 cm)

Amazon Price: $27.39 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 24 hours
List Price: $27.39

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  #2

Supco APR5 Wire to Wire Adjustable Potential Relay, 30 A Load Current, 110 - 270 VAC Single Phase Operating Voltage

 Ean: 0687152010080   |    PartNumber: APR5   |   Asin: B004XS1ML6

This Supco APR5 wire-to-wire adjustable potential relay is used to start 1-phase, capacitor-type motors in air conditioning and refrigeration applications. It is a replacement part with adjustable settings for wire-to-wire replacement of most potential relays with 110 to 270 VAC pickup voltage. It has a safety time-out of 1 to 1.5 sec, at which point the contacts will open if the motor does not start. It has universal, non-positional mounting and adapters for screw or push-on terminals. This adjustable potential relay replaces 3- and 5-terminal potential relays and is suitable for use with single phase motors or air conditioning and refrigeration compressors up to 5 hp.

Specifications Operating voltage 110-270 VAC Load current 30 amp Time setting range 0.05 100 sec Operating temperature -40 to +150 degrees F Dimensions* 1.5 x 2.25 x 1.75" (H x W x D) *H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Relay switches (also called an electrical relay or an electrical relay switch) use a small amount of power to control a larger source of power connected to electrical devices such as car motors, computers, and lighting installations. A basic relay switch has a control circuit with an electromagnetic coil and a load circuit with contacts and a lever. When current flows into the relay switch, it moves through the coil and a magnetic field is created, which causes the lever in the load circuit to move between contacts, either turning the device on or off. In a normally open (NO) relay switch, when power is supplied to the relay, the load circuit is closed and the power source connected to the relay is turned on. In a normally closed (NC) relay switch, when power is supplied to the relay, the load circuit is open and the power source connected to the relay is turned off. In other types of relay switches, non-moving parts such as transistors or semiconductors can be used as the control circuit to operate the switching mechanism. Relay switches can be controlled with an external switch, such as a light switch, or they can be connected to an automatically switched power source, such as a car ignition. One relay can operate multiple switches, and multiple relays can be operated with a single switch, with each relay operating independently from the other relays in the system.

Supco manufactures test instruments and replacement parts for heating, ventilation, air conditioning, and refrigeration systems. The company, founded in 1945, is headquartered in Allenwood, NJ.

Features

  • Adjustable potential relay for HVAC/R
  • Set pick up voltage
  • Safety time-out of 1 to 1.5 sec
  • Universal, non-positional mounting and adapters for screw or push-on terminals
  • Replaces 3- and 5-terminal potential relays
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Brand: Supco   |   Manufacturer: Supco

Package Dimensions: 2.5 x 2.5 x 6.1 inches (6.4 x 6.4 x 15.5 cm)

Amazon Price: $20.93 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 24 hours
List Price: $24.22 | Used Price: $17.99

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  #3

Voltage Monitoring Relay DC 12V/24V/36V/48V Over-Voltage and Under-Voltage Protection Relay 35MM Guide Rail 13-17V 10-14V(DC24V)

 Ean: 0748018730051   |    PartNumber: YWBL-WHamgsv40wqb-02   |   Asin: B07QDW2WN3

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

Features

  • 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
  • See more on Amazon...

Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Package Dimensions: 1.1 x 3.3 x 3.4 inches (2.8 x 8.4 x 8.6 cm)

Amazon Price: $25.59 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 24 hours
List Price: $25.59

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  #4

ATC SLA-440-ALE Monitor/Relay, 430-480 Adjustable, Lock Shaft Adjusted, Surface Mounted, 8 Screw Terminals

Model: SLA-440-ALE   |    Mpn: SLA-440-ALE   |    PartNumber: SLA-440-ALE   |   Asin: B00DWI316W

The ATC Diversified SLA Series is designed to protect 3-phase equipment against Phase Loss, Under Voltage, and Phase Reversal conditions. With normal operating voltages applied in the proper ABC sequence, the internal relay will energize (Pick-Up). When incorrect phase sequence or phase loss occurs or the three-phase voltages fall below the drop out voltages, the relay will de-energize (Drop-Out). On models featuring indicators, the LED glows when all line conditions are normal. Both Delta and Wye systems may be monitored. In Wye systems, connections to neutral are NOT required. For UL Listed units, with field wiring terminals, copper wire with 60 /75 C rating must be used for control circuitry connections. NOTE: When a phase is lost while the motor is running, a condition known as regeneration occurs where a voltage is induced into the open phase nearly equal in magnitude to the normal phase-to-phase voltage. However, with the exception of lightly loaded motors, enough change is detected by the SLA to provide the required protection when properly adjusted. The SLA Series is UL Listed under File Number E55826.

Features

  • Delta or Wye Systems
  • Fixed, Lock Shaft, or Screwdriver Adjustment
  • Available up to 480 VAC (625 VAC with E Style)
  • Several Enclosure Styles
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Brand: Atc   |   Manufacturer: ATC

Package Dimensions: 4.17 x 4.29 x 4.61 inches (10.6 x 10.9 x 11.7 cm)

Amazon Price: $243.99 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 24 hours
List Price: $243.99

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  #5

Voltage Monitoring Relay DC 12V/24V/36V/48V Over-Voltage and Under-Voltage Protection Relay 35MM Guide Rail 13-17V 10-14V(DC48V)

 Ean: 0748018730075   |    PartNumber: YWBL-WHamgsv40wqb-04   |   Asin: B07QJ8B21R

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

Features

  • 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
  • See more on Amazon...

Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Package Dimensions: 0.1 x 0.1 x 0.1 inches (0.3 x 0.3 x 0.3 cm)

Amazon Price: $24.79 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 24 hours
List Price: $24.79

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  #6

Voltage Monitoring Relay DC 12V/24V/36V/48V Over-Voltage and Under-Voltage Protection Relay 35MM Guide Rail 13-17V 10-14V(DC12V)

 Ean: 0748018730044   |    PartNumber: YWBL-WHamgsv40wqb-01   |   Asin: B07QDW3BDR

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

Features

  • 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
  • See more on Amazon...

Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Package Dimensions: 1.1 x 3.3 x 3.4 inches (2.8 x 8.4 x 8.6 cm)

Amazon Price: $25.59 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 24 hours
List Price: $25.59

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  #7

Voltage Monitoring Relay, GRV8-04 M460 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection 176V-552V Range for Equipment Protection

 Ean: 0789904955271   |    PartNumber: Jarchiin1tvmhfy8d   |   Asin: B07WPGZHK1

Features:
1. This relay can monitor own working voltage (true RMS measurement).
2. 8 kinds of adjustable rated voltage.
3. Voltage measurement accuracy is not more than 1%.
4. Relay working status is indicated by LED indicators.
5. With super small volume, this relay can be mounted on 35mm DIN rail.
6. Application: Equipment protection and control(tower crane, elevator, agriculture equipment, refrigerated trucks); Protect equipment from reverse running; Normal/emergency power supply switch; Protect against phase failure of a dynamic load.

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 x 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: 1x107
Mounting method: 35mm DIN rail mounting
Mount altitude: 2000m
Weight: Approx. 78g/2.7oz

Package list:
1 * Voltage Monitoring Relay

Features

  • This relay can monitor own working voltage (true RMS measurement).
  • 8 kinds of adjustable rated voltage.
  • Voltage measurement accuracy is not more than 1%.
  • With super small volume, this relay can be mounted on 35mm DIN rail.
  • Relay working status is indicated by LED indicators.
  • See more on Amazon...

Brand: Jarchii   |   Manufacturer: Jarchii

Item Dimensions: 2.76 x 1.18 x 3.94 inches (7.0 x 3.0 x 10.0 cm)   |   

Amazon Price: $14.87 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $15.49

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  #8

3 Phase Voltage Monitoring Relay,250VAC / 24VDC 35MM DIN Rail Mount Phase Sequence Protective Relay,Adjustable Voltage Electronic Industrial Control Power Off Relay,with LED Indicators.

 Ean: 0739551670645   |    PartNumber: Jectse71yod5f3kb   |   Asin: B07WHS98PV

Features:

1. This relay can monitor own working voltage (true RMS measurement).
2. 8 kinds of adjustable rated voltage.
3. Voltage measurement accuracy is not more than 1%.
4. Relay working status is indicated by LED indicators.
5. With super small volume, this relay can be mounted on 35mm DIN rail.
6. Application: Equipment protection and control(tower crane, elevator, agriculture equipment, refrigerated trucks); Protect equipment from reverse running; Normal/emergency power supply switch; Protect against phase failure of a dynamic load.

Specification:

Function: Monitor L-N voltage (3-phase 4-wire system)
Monitoring terminal: L1-L2-L3-N
Power: L1-N
Rated working voltage: 127-132-138-220-230-240-254-265 (P-N)
Rated power frequency: 45Hz-65Hz
Measuring range: 101V-318V
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 x SPDT; 10A/ AC1; 250VAC/24VDC
Minimum switching power: 500mW
Overvoltage: 2%-20%
Undervoltage: -20%-2%
Unbalanced voltage: 5%-15%
Action delay time: 2s
Phase sequence protection: Yes
Phase failure protection: Yes
Power indicator: Green LED
Output relay indication: Red LED
Mechanical life: 1x107
Mounting method: 35mm DIN rail mounting
Mount altitude: 2000m
Weight: Approx. 76g/2.7oz

Package list:
1 * Voltage Monitoring Relay

Features

  • This relay can monitor own working voltage (true RMS measurement).
  • 8 kinds of adjustable rated voltage.
  • Voltage measurement accuracy is not more than 1%.
  • Relay working status is indicated by LED indicators.
  • With super small volume, this relay can be mounted on 35mm DIN rail.
  • See more on Amazon...

Brand: Jectse   |   Manufacturer: Jectse

Item Dimensions: 2.76 x 1.18 x 3.94 inches (7.0 x 3.0 x 10.0 cm)   |   Package Dimensions: 0.83 x 2.99 x 3.74 inches (2.1 x 7.6 x 9.5 cm)

Amazon Price: $29.99 | as of 10/16/2019(12:14pm pst)
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List Price: $29.99

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  #9

3 Phase Circuit Protection, 3 Phase Circuit Protection Voltage Relay Phase Failure Sequence Protector for Industrial Home

 Ean: 0739879151406   |    PartNumber: Suchinmr185bygwe6   |   Asin: B07Z5PJM9S

. 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.
. Reverse phase protection, a protection measure to prevent L1, L2, L3 three-phase AC phase sequence from being connected incorrectly, delay 2S action.
. Widely used in air compressors, electric motors, distribution boxes, water pumps, oil pumps, central air conditioning units, etc.

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.

Features

  • 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.
  • Size: Approx. 79 x 23 x 79mm / 3.1 x 0.9 x 3.1in
  • 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, a protection measure to prevent L1, L2, L3 three-phase AC phase sequence from being connected incorrectly, delay 2S action.
  • Voltage imbalance protection, which refers to a protective measure that will affect the safe operation of the line due to three-phase voltage imbalance.
  • See more on Amazon...

Brand: Suchinm   |   Manufacturer: Suchinm

Amazon Price: $19.09 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $19.09

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  #10

3 Phase Circuit Protector, 3 Phase Circuit Protection Voltage Relay Phase Failure Sequence Protector for Industrial Home

 Ean: 0739879151048   |    PartNumber: Suchinmpz81imgx65   |   Asin: B07Z5PHMQL




. Indicated by five indicators: normal, phase loss(voltage three-phase unbalance), reverse phase.

. 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, a protection measure to prevent L1, L2, L3 three-phase AC phase sequence from being connected incorrectly, delay 2S action.

. Voltage imbalance protection, which refers to a protective measure that will affect the safe operation of the line due to three-phase voltage imbalance.


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.

Features

  • 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 five indicators: normal, phase loss(voltage three-phase unbalance), reverse phase. Widely used in air compressors, electric motors, distribution boxes, water pumps, oil pumps, central air conditioning units, etc.
  • 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, a protection measure to prevent L1, L2, L3 three-phase AC phase sequence from being connected incorrectly, delay 2S action.
  • Size: Approx. 79 x 23 x 79mm / 3.1 x 0.9 x 3.1in
  • See more on Amazon...

Brand: Suchinm   |   Manufacturer: Suchinm

Amazon Price: $19.19 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $19.19

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  #11

Phase Sequence, Exquisite Compact 380V TH-215 Three Phase Sequence Control Relays Voltage Monitor Power Protection Relay for Automated Control Systems

 Ean: 0739879036062   |    PartNumber: Taiddatzsc9hgiam   |   Asin: B07Z55LSXV

Features:
1. The TH-215 uses advanced large-scale integrated circuits.
2. It has beautiful appearance, exquisite and compact, high precision and reliable action.
3. Low power consumption, long life, large contact capacity and easy installation.
4. Used in all types of automated control systems.
5. With phase sequence, off-phase, and three-phase unbalance protection functions.

Specification:
Condition: 100% Brand New
Material: Plastic
Model: TH-215
Number of Poles: 1P
Rated Frequency: 50 (Hz)
Rated Insulation Voltage: 380(V)
Arc Extinguishing Method: Vacuum circuit breaker
Electrical Endurance: Ten thousand time
Mechanical Life: Ten thousand time
Contact Capacity: 8A 250VAC
Contact Quantity: Normally open, normally closed Action 1 conversion SPDT(1)
Altitude:

Features

  • With phase sequence, off-phase, and three-phase unbalance protection functions.
  • Low power consumption, long life, large contact capacity and easy installation.
  • It has beautiful appearance, exquisite and compact, high precision and reliable action.
  • The TH-215 uses advanced large-scale integrated circuits.
  • Used in all types of automated control systems.
  • See more on Amazon...

Brand: Taidda   |   Manufacturer: Taidda

Amazon Price: $15.99 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $15.99

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  #12

Liukouu SVR-220 Single-Phase Voltage Monitoring Relay Overvoltage Undervoltage Protector 220VAC

 Ean: 0739879972476   |    PartNumber: Liukouu7gu3b9yzcw   |   Asin: B07Z53411V

Features:
1. Single-phase voltage monitoring of overvoltage and undervoltage
2. Powered by the measuring circuit, no extra power supply required.
3. 1 group of normally open(NO) and normally closed(NC) contacts.
4. 3 LEDs for status indication of overvoltage, undervoltage and normal.
5. Compact size, 35mm DIN rail mount.
6. Typical application: Motor, fan, pump, air compressor, elevator, machine tool, central air conditioner, etc.

Specification:
Model: SVR-220
Monitoring Terminal: L, N
Rated Voltage: 220VAC
Protection Function: Overvoltage, undervoltage
Overvoltage Setting Value: 253VAC
Undervoltage Setting Value: 187VAC
Working Status Indication: Overvoltage, Undervoltage, Normal
Contact Form: 1NO + 1NC
Contact Capacity: 3A 250VAC (resistive)
Mounting: 35mm DIN rail
Dimensions (height * width * depth): 68*30*76mm / 2.7*1.2*3.0in
Package Weight: 91g

Package List:
1 x Overvoltage Undervoltage Protector Relay

Features

  • 1. Single-phase voltage monitoring of overvoltage and undervoltage
  • 2. Powered by the measuring circuit, no extra power supply required.
  • 3. 1 group of normally open(NO) and normally closed(NC) contacts.
  • 4. 3 LEDs for status indication of overvoltage, undervoltage and normal.
  • 5. Compact size, 35mm DIN rail mount.
  • See more on Amazon...

Brand: Liukouu   |   Manufacturer: Liukouu

Amazon Price: $13.69 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $13.69

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  #13

Nitrip GRV8-04 3-Phase Voltage Monitoring Relay Phase Sequence Phase Failure Protection M265

 Ean: 0705989760692   |    PartNumber: NITRIPbo1kht02ru   |   Asin: B07YY6S775

Specification:
Function: Monitor L-N voltage (3-phase 4-wire system)
Monitoring terminal: L1-L2-L3-N
Power: L1-N
Rated working voltage: 127-132-138-220-230-240-254-265 (P-N)
Rated power frequency: 45Hz-65Hz
Measuring range: 101V-318V
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 x 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: 1x107
Mounting method: 35mm DIN rail mounting
Mount altitude: 2000m
Weight: Approx. 76g/2.7oz

Package list:
1 * Voltage Monitoring Relay

Features

  • This relay can monitor own working voltage (true RMS measurement).
  • 8 kinds of adjustable rated voltage.
  • Voltage measurement accuracy is not more than 1%.
  • Relay working status is indicated by LED indicators.
  • With super small volume, this relay can be mounted on 35mm DIN rail.
  • See more on Amazon...

Brand: NITRIP   |   Manufacturer: NITRIP

Item Dimensions: 2.76 x 1.18 x 3.94 inches (7.0 x 3.0 x 10.0 cm)   |   

Amazon Price: $18.99 | as of 10/16/2019(12:14pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $18.99

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