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Best Phase Monitoring Relays - Buying Guide

Last Updated: 01/18/2019

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Bestselling Phase Monitoring Relays on Amazon

  1. Siemens 3UG4511-1BP20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  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. Siemens 3UG4615-1CR20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  5. Siemens 3UG4617-1CR20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  6. ATC SLA-440-ALE Monitor/Relay, 430-480 Adjustable, Lock Shaft Adjusted, Surface Mounted, 8 Screw Ter...
  7. Siemens 3UG4513-1BR20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  8. Schneider RM22TG20 3 PHASE CONTROL RELAY RM22-TG - RANGE 18
  9. Siemens 3UG4622-1AW30 Monitoring Relay, Single Phase Current Monitoring, 22.5mm Width, Screw Termina...
  10. Schneider RM22TR33 3 PHASE VOLTAGE CONTROL RELAY RM22-TR

  #1

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

' Adjustable Potential Relay, Pick Up Voltage Rating 130-270 Volts, Power Rating Up to 5 HP '

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: $23.22 | as of 01/18/2019(10:32am pst)
Availibility: Usually ships in 1-2 business days
List Price: $24.22

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  #2

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: $230.00 | as of 01/18/2019(10:32am pst)
Availibility: Usually ships in 24 hours
List Price: $230.00 | Used Price: $199.99

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  #3

Siemens 3UG4622-1AW30 Monitoring Relay, Single Phase Current Monitoring, 22.5mm Width, Screw Terminal, 1 CO Contacts, 0.05A AC/DC Measuring Range, 0.01A-5A Hysteresis, 0-20 s Starting Bypass Time, 0-20 s Off Delay, 24-240VAC/DC Auxiliary Voltage

Model: 3UG46221AW30   |    Mpn: 3UG46221AW30   |    Ean: 4011209642423   |    PartNumber: 3UG46221AW30   |   Asin: B0091WERKW

Only two versions from 2 mA to 10 A. Can be variably set to over range, under range or window monitoring. Freely parameterizable delay times and reset switch. Actual value and fault type are permanently displayed. All of the versions have removable terminals. All of the versions have screw terminals or, alternatively, innovative Cage Clamp terminals

Features

  • 22.5 mm wide
  • Can be digitally set and with LCD display
  • Fault memory that can be switched-in
  • Simultaneous monitoring for current over range/under range over the complete measuring range
  • Wide-voltage versions reduce stock inventory costs
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Brand: Siemens   |   Manufacturer: Siemens

Item Dimensions: 0.24 x 0.31 x 0.31 inches (0.6 x 0.8 x 0.8 cm)   |   Package Dimensions: 1.2 x 3.9 x 4.3 inches (3.0 x 9.9 x 10.9 cm)

Amazon Price: $70.53 | as of 01/18/2019(10:32am pst)
Availibility: Usually ships in 24 hours
List Price: $177.59 | Used Price: $63.80

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  #4

M265 Voltage Monitoring Relay, 3-Phase 4-Wire Voltage Monitoring Relay Voltage Adjustable with Phase Sequence/Failure Protection

 Ean: 0736077275729   |    PartNumber: Wal frontgd1hq4skgw   |   Asin: B07L924N9B

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. 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

  • 3-PHASE VOLTAGE MONITOR -- Function: Monitor L-N voltage (3-phase 4-wire system), Monitoring terminal: L1-L2-L3-N, Power: L1-N.
  • MONITOR WORKING VOLTAGE -- This relay can monitor own working voltage (true RMS measurement). 8 kinds of adjustable rated voltage.
  • 1% MEASUREMENT ACCURACY -- Voltage measurement accuracy is not more than 1%. Relay working status is indicated by LED indicators.
  • SUPER SMALL VOLUME -- With super small volume, this relay can be mounted on 35mm DIN rail. Weight: Approx. 76g/2.7oz.
  • WIDE 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.
  • See more on Amazon...

Brand: Wal front   |   Manufacturer: Wal front

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

Amazon Price: $29.59 | as of 01/18/2019(10:32am pst)
Availibility: Usually ships in 1-2 business days
List Price: $29.59

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  #5

Voltage Monitoring Relay GRV8-05, 3-Phase 4-Wire Voltage Monitor Relay M265 Phase Sequence&Failure Protection DIN Rail Mounting

 Ean: 0736077260367   |    PartNumber: Wal frontwpdscf2age   |   Asin: B07L8TC48L

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. 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: 8%
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

  • MONITOR SPECIFICATION -- Function: Monitor L-N voltage (3-phase 4-wire system), Power: L1-N, Measuring range: 101V-318V.
  • PHASE PROTECTION -- Phase sequence/failure protection, Power indicator: Green LED, Output relay indication: Red LED. .
  • INDICATOR VOLTAGE -- This relay can monitor own working voltage (true RMS measurement), 8 kinds of adjustable rated voltage.
  • ACCURATE MEASURE -- Voltage measurement accuracy is not more than 1%. Relay working status is indicated by LED indicators.
  • DIN RAIL MOUNTING -- With super small volume, this relay can be mounted on 35mm DIN rail.
  • See more on Amazon...

Brand: Wal front   |   Manufacturer: Wal front

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

Amazon Price: $30.29 | as of 01/18/2019(10:32am pst)
Availibility: Usually ships in 1-2 business days
List Price: $30.29

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  #6

GRT8-A1 Mini Power On Delay Time Relay, AC/DC 12V~240V Single Function Power-on Delay Relay DIN Rail Mounted

 Ean: 0736077187121   |    PartNumber: Wal front8hz6n3etv9   |   Asin: B07L69WRHK

Description:
This power-on delay relay with AC/DC 12V-240V working voltage. It has super wide time delay range, 0.1s - 10days, include 10 kinds of settings. With super small volume, this relay can be mounted on 35mm DIN rail. It is a single function power-on delay relay and time delay can be set by panel knob. Suitable for industrial equipment, lighting control, heating element control etc.

Specification:
Function: Delay ON
Rated power supply voltage: AC/DC 12-240V (50-60Hz)
Power terminal: A1-A2
Power consumption: AC 0.09-3VA/DC 0.05-1.7W
Setting method: knob
Power indicator: Green LED
Delay range: 0.1s-10 days, normally open, normally closed
Setting accuracy: 10%
Output contact: 1 SPDT, 16A/AC1, 250VAC/24VDC
Minimum switching power: 500mW
Output relay indication: red LED
Mechanical life: 1 107
Reset time: Max 200ms
Working temperature: -20 ~55
Mounting method: 35mm DIN rail
Mounting altitude: 2000m
Weight: Approx. 75g/2.6oz

Package List:
1 On Delay Time Relay

Features

  • [10 kinds of time settings]:This time relay has super wide time delay range, 0.1s - 10days, include 10 kinds of settings.
  • [35mm DIN rail mounted]:With super small volume, this relay can be mounted on 35mm DIN rail.
  • [Single function relay]:This is a single function power-on delay relay and time delay can be set by panel knob.
  • [LED indicators]:Relay working status is indicated by LED indicators, with AC/DC 12V-240V working voltage.
  • [Application]:This time relay can be used for industrial equipment, lighting control, heating element control etc.
  • See more on Amazon...

Brand: Wal front   |   Manufacturer: Wal front

Item Dimensions: 2.76 x 0.79 x 3.94 inches (7.0 x 2.0 x 10.0 cm)   |   

Amazon Price: $27.59 | as of 01/18/2019(10:32am pst)
Availibility: Usually ships in 1-2 business days
List Price: $27.59

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  #7

GRT8-M2 Multifunction Time Relay with 10 Functions, DIN Rail Mount Delay Time Relay AC/DC 12V-240V

 Ean: 0736077183437   |    PartNumber: Wal frontnk3ua596dw   |   Asin: B07L68KLB8

Description:
This is a multifunctional time relay and time delay can be set by panel knob. It has 10 kinds of delay functions including delay on, delay off, cycle delal and so on. Relay working status is indicated by LED indicators, with super wide time delay, you can set delay time range of 0.1s - 10days. With super small volume, this relay can be mounted on 35mm DIN rail. Widely used for industrial equipment, lighting control, heating element control, motor, fan control and more.

Specification:
Rated power supply voltage: AC/DC 12V-240V(50-60Hz)
Power terminal: A1-A2
Power consumption: AC0.09-3VA/DC0.05-1.7W
Setting method: knob
Setting accuracy: 10%
Power indicator: Green LED
Delay range: 0.1s-10 days, normally open, normally closed
Repeated accuracy: 0.2%
Temperature fluctuation error: 0.05%/ , at = 20
Output contact: 2 x SPDT, 250VAC/24VDC
Minimum switching power: 500mW
Output relay indication: Red LED
Mechanical life: 1x107
Reset time: Max 200ms
Working temperature: -20 ~55
Mounting method: 35mm DIN rail
Mounting altitude: 2000m
Weight: Approx. 95g/3.3oz

Package List:
1 Multifunctional Delay Time Relay

Features

  • [10 functions choices]:With 10 kinds of delay functions including delay on, delay off, cycle delal and so on.
  • [Super wide delay time]:The delay time is super wide, you can set delay time range of 0.1s - 10days.
  • [LED indicators]:Designed with LED indicators, you can know the relay working status anytime.
  • [DIN rail mounted]:With super small volume, this relay can be mounted on 35mm DIN rail.
  • [Application]:This time relay can be used for industrial equipment, lighting control, heating element control, motor, fan control and more.
  • See more on Amazon...

Brand: Wal front   |   Manufacturer: Wal front

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

Amazon Price: $33.59 | as of 01/18/2019(10:32am pst)
Availibility: Usually ships in 1-2 business days
List Price: $33.59

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  #8

AC 220V GRT8-M1 Delay Time Relay with 10 Functions Choices DIN Rail Mount for Industrial Equipment Lighting Control

 Ean: 0736077166294   |    PartNumber: Wal front09wqbpgie5   |   Asin: B07L687P79

Description:
This time relay has super small volume, can be mounted on 35mm DIN rail. It is a multifunctional time relay and time delay can be set by panel knob, with 10 kinds of delay functions including delay on, delay off, cycle delay and so on. Designed with LED indicators, relay working status is indicated by LED indicators. The delay range is 0.1s - 10days, used for industrial equipment, lighting control, heating element control, motor, fan control and more.

Specification:
Rated power supply voltage: AC 220V (50-60Hz)
Power terminal: A1-A2
Power consumption: AC max.6VA/1.3W
Setting method: knob
Setting accuracy: 10%
Power indicator: Green LED
Delay range: 0.1s-10 days, normally open, normally closed
Repeated accuracy: 0.2%
Temperature fluctuation error: 0.05%/ , at = 20
Output contact: 1 SPDT, 250VAC/24VDC
Minimum switching power: 500mW
Output relay indication: red LED
Mechanical life: 1 107
Reset time: Max 200ms
Working temperature: -20 ~55
Mounting method: 35mm DIN rail
Mounting altitude: 2000m
Weight: Approx. 75g/2.6oz

Package List:
1 Multifunctional Delay Time Relay

Features

  • [Delay time range]:The delay range is 0.1s - 10days.
  • [High cost performance]:This is a multifunctional time relay and time delay can be set by panel knob, with 10 kinds of delay functions including delay on, delay off, cycle delay and so on.
  • [Product size]:Ultra-small size, can be mounted on 35mm DIN rail.
  • [Relay status]:Designed with LED indicators, relay working status is indicated by LED indicators.
  • [Application]:This time relay can be used for industrial equipment, lighting control, heating element control, motor, fan control and more.
  • See more on Amazon...

Brand: Wal front   |   Manufacturer: Wal front

Item Dimensions: 2.76 x 0.79 x 3.94 inches (7.0 x 2.0 x 10.0 cm)   |   

Amazon Price: $21.89 | as of 01/18/2019(10:32am pst)
Availibility: Usually ships in 1-2 business days
List Price: $21.89

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Looking For Something Else? Search

Most Popular
New Releases

  1. Supco APR5 Wire to Wire Adjustable Potential Relay, 30 A Load Current, 110 - 270 VAC Single Phase Op...
  2. ATC SLA-440-ALE Monitor/Relay, 430-480 Adjustable, Lock Shaft Adjusted, Surface Mounted, 8 Screw Ter...
  3. Siemens 3UG4622-1AW30 Monitoring Relay, Single Phase Current Monitoring, 22.5mm Width, Screw Termina...

Most Wished For

  1. Supco APR5 Wire to Wire Adjustable Potential Relay, 30 A Load Current, 110 - 270 VAC Single Phase Op...
  2. ATC SLA-440-ALE Monitor/Relay, 430-480 Adjustable, Lock Shaft Adjusted, Surface Mounted, 8 Screw Ter...
  3. Siemens 3UG4622-1AW30 Monitoring Relay, Single Phase Current Monitoring, 22.5mm Width, Screw Termina...

Most Gifted

  1. Supco APR5 Wire to Wire Adjustable Potential Relay, 30 A Load Current, 110 - 270 VAC Single Phase Op...
  2. ATC SLA-440-ALE Monitor/Relay, 430-480 Adjustable, Lock Shaft Adjusted, Surface Mounted, 8 Screw Ter...
  3. Siemens 3UG4622-1AW30 Monitoring Relay, Single Phase Current Monitoring, 22.5mm Width, Screw Termina...

Top Selling

  1. Supco APR5 Wire to Wire Adjustable Potential Relay, 30 A Load Current, 110 - 270 VAC Single Phase Op...
  2. ATC SLA-440-ALE Monitor/Relay, 430-480 Adjustable, Lock Shaft Adjusted, Surface Mounted, 8 Screw Ter...
  3. Siemens 3UG4622-1AW30 Monitoring Relay, Single Phase Current Monitoring, 22.5mm Width, Screw Termina...



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