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Best Phase Monitoring Relays - Buying Guide

Last Updated: 04/22/2019

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Bestselling Phase Monitoring Relays on Amazon

  1. ATC SLA-440-ALE Monitor/Relay, 430-480 Adjustable, Lock Shaft Adjusted, Surface Mounted, 8 Screw Ter...
  2. Voltage Monitoring Relay DC 12V/24V/36V/48V Over-Voltage and Under-Voltage Protection Relay 35MM Gui...
  3. Siemens 3UG4512-1AR20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  4. Supco APR5 Wire to Wire Adjustable Potential Relay, 30 A Load Current, 110 - 270 VAC Single Phase Op...
  5. Schneider RM22TU23 3 PHASE UNDERVOLTAGE CONTROL RELAY RM22-TU
  6. Schneider RM22TG20 3 PHASE CONTROL RELAY RM22-TG - RANGE 18
  7. Siemens 3UG4511-1BP20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  8. Siemens 3UG4632-1AW30 Monitoring Relay, Single Phase Voltage Monitoring, Screw Terminal, 1 CO Contac...
  9. Siemens 3UG4512-1BR20 Monitoring Relay, Three Phase Voltage, Insulation Monitoring, 22.5mm Width, Sc...
  10. Siemens 3UG4622-1AW30 Monitoring Relay, Single Phase Current Monitoring, 22.5mm Width, Screw Termina...

  #1

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: $247.00 | as of 04/22/2019(6:19pm pst)
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  #2

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
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Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Amazon Price: $24.99 | as of 04/22/2019(6:19pm pst)
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  #3

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: $20.93 | as of 04/22/2019(6:19pm pst)
Availibility: Usually ships in 24 hours
List Price: $24.22

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  #4

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 04/22/2019(6:19pm pst)
Availibility: Usually ships in 24 hours
List Price: $70.53 | Used Price: $65.95

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  #5

APR-4 Waterproof Phase Reverse Protection Relay 10A 220/380VAC Multipurpose Phase Failure Relay (220VAC)

 Ean: 0783335820405   |    PartNumber: Walfrontynw02pgsb4-01   |   Asin: B07P8R94JK

Description:
This product is great for phase failure, phase reverse, phase sequence protection. It features waterproof and dustproof, and it is easy to carry with small volume.

Specification:
Model: APR-4
Working voltage: 220VAC, 380VAC (Optional)
Rated current: 5A
Contact load: 5A 250VAC
Contact type: 1NO + 1NC
Delay accuracy: 0.5%
Mounting method: DIN rail
Operating temperature: ~40
Dimensions: 50 40 57mm / 1.97 1.57 2.24in
Package weight: Approx. 156g/5.5oz

Package list:
1 Phase Sequence Relay

Features

  • [Protection functions]: It is great for phase failure, phase reverse, phase sequence protection.
  • [Widely used]:It can be used to provide relay protection for various three-phase equipment such as motors, compressor, pump, fan, blower and so on.
  • [Waterproof and dustproof]:It features high quality flame-retardant PV housing, waterproof and dustproof.
  • [Stable performance]:There are 8 pins with good contact performance to ensure stable working.
  • [Small volume]:It is designed with small volume, and DIN rail mounting.
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Brand: Wal front   |   Manufacturer: Wal front

Item Dimensions: 1.97 x 2.17 x 3.35 inches (5.0 x 5.5 x 8.5 cm)   |   

Amazon Price: $14.69 | as of 04/22/2019(6:19pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $14.69

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  #6

380V Three Phase Voltage Monitoring Relay, Power Protection Relay Three Phase Sequence Control Relays Voltage Monitor

 Ean: 0748018058032   |    PartNumber: Keenso3d8zuaingk   |   Asin: B07QMRC8VR

Keenso- This 380v three phase voltage monitoring relay comes with phase sequence, off-phase, and three-phase unbalance protection functions. Used in all types of automated control systems.


Specification:
Model: TH-201
Number of poles: 1P
Rated frequency: 50 (Hz)
Rated insulation voltage: 24~380(V)
Arc extinguishing method: Vacuum circuit breaker
Mechanical life: 100 (one million time)
Contact capacity: AC250V DC30V 8A
Rated voltage: Three-phase or three-phase four-wire AC 380V 50Hz
Number of contacts: Normally open, normally closed Action 1 conversion SPDT(1)
Electrical life: 105 times
Mechanical life: 106 times
Altitude:

Features

  • Multiple Protection Functions: This 380v three phase voltage monitoring relay comes with phase sequence, off-phase, and three-phase unbalance protection functions. Used in all types of automated control systems
  • High Precision & Reliable Action: The three phase sequence relay has beautiful appearance, exquisite and compact, high precision and reliable action. Low power consumption, long life, large contact capacity and easy installation. Smooth operation, superior performance
  • Advanced Integrated Circuits: The phase sequence protection relay uses advanced large-scale integrated circuits, and its appearance is comparable to that of similar products in Europe
  • Premium Quality: Made of premium material, this 380v three phase voltage monitoring relay is sturdy, not easy to aging and abrasion resistant, to ensure maximum strength and durability for long lasting usage
  • What You Will Get: We stand behind all of our them with a 100% product guarantee and promise to give you the best in customer care! If you have any issue about the item, please contact us by e-mail, we will try our best within 24 hours to reply
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Brand: Keenso   |   Manufacturer: Keenso

Amazon Price: $39.99 | as of 04/22/2019(6:19pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $39.99

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  #7

Voltage Monitoring Relay Single-phase Voltage Monitoring Relay SVR-220 Overvoltage Undervoltage Protector 220VAC 1NO + 1NC

 Ean: 0748018874632   |    PartNumber: YWBL-WH8qah7ug2zg   |   Asin: B07QKDM3FG

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 Overvoltage Undervoltage Protector Relay




Features

  • PRODUCT NAME---Overvoltage Undervoltage Protector Relay; Rated Voltage: 220VAC; Protection Function: Overvoltage, undervoltage; Overvoltage Setting Value: 253VAC; Undervoltage Setting Value: 187VAC; Contact Form: 1NO 1NC; Contact Capacity: 3A 250VAC (resistive); Mounting: 35mm DIN rail
  • MAIN FEATURES---The voltage monitoring relay is equipped with 1 group of normally open(NO) and normally closed(NC) contacts, with compact size, 35mm DIN rail mount, easy to install
  • 3 LED STATUS INDICATION---The voltage monitoring relay is equipped with 3 LEDs for status indication of overvoltage, undervoltage and normal, convenient to operate
  • NO EXTRA POWER REQUIRED---The voltage monitoring relay is powered by the measuring circuit, no extra power supply required, achieving monitoring of overvoltage and undervoltage
  • TYPICAL APPLICATION---The voltage monitoring relay is typically applied to motor, fan, pump, air compressor, elevator, machine tool, central air conditioner, etc
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Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Amazon Price: $19.19 | as of 04/22/2019(6:19pm pst)
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  #8

Voltage Monitoring Relay DC 12V/24V/36V/48V Over-Voltage and Under-Voltage Protection Relay 35MM Guide Rail 13-17V 10-14V(DC36V)

 Ean: 0748018730068   |    PartNumber: YWBL-WHamgsv40wqb-03   |   Asin: B07QJ8BQYR

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

Amazon Price: $24.99 | as of 04/22/2019(6:19pm pst)
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  #9

3 Phase Voltage Monitoring Relay JVR-380W Circuit Over Under Voltage Monitoring Relay Phase Failure Phase Sequence Protector Rated Voltage 380VAC 50/60Hz 35 MM Rail

 Ean: 0748018528382   |    PartNumber: YWBL-WHu9atwebyvh   |   Asin: B07QGW8NLQ

Features:
1. Compact size, rail mounted, no additional auxiliary power required.
2. The overvoltage and undervoltage value is independently adjustable.
3. 1 sets of normally open normally closed contacts, 5 indicators indicate various working conditions.
4. Overvoltage, undervoltage, phase error, phase loss, voltage imbalance and other protection functions.
5. Used in electric motors, fans, water pumps, air compressors, cranes, driving, lifts, elevators, machine tools, central air conditioners, refrigeration equipment, industrial control systems, etc.
Specification:
Model: JVR-380W
Detection circuit: L1, L2, L3,
Rated voltage: 380VAC 50/60Hz
Overvoltage setting: 399-456VAC
Undervoltage setting: 304-361VAC
Protection function: Overvoltage, undervoltage, phase error, phase loss, voltage imbalance
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 open normally closed contacts
Contact Capacity: 250V/AC 2.5A (resistive)
Rated current: 3 (A)
Installation method: 35mm rail
Package list: 1 Voltage Protector

Features

  • PRODUCT NAME---3 Phase Voltage Monitoring Relay; Rated voltage: 380VAC 50/60Hz; Overvoltage setting: 399-456VAC; Undervoltage setting: 304-361VAC; Voltage setting range: 5% - 20%; Contact Capacity: 250V/AC 2.5A (resistive); Rated current: 3 (A); Installation method: 35mm rail
  • MULTI FUNCTION---The 3 phase voltage monitoring relay could provide overvoltage, undervoltage, phase error, phase loss, voltage imbalance and other protection functions
  • MAIN FEATURES---The overvoltage and undervoltage value is independently adjustable. The 3 phase voltage monitoring relay is of 1 sets of normally open normally closed contacts, 5 indicators indicate various working conditions
  • NO ADDITIONAL POWER REQUIRED---With compact size, 35mm rail mounted, the 3 phase voltage monitoring relay is of no additional auxiliary power required, convenient to use
  • USED FOR---The 3 phase voltage monitoring relay is widely used in electric motors, fans, water pumps, air compressors, cranes, driving, lifts, elevators, machine tools, central air conditioners, refrigeration equipment, industrial control systems, etc
  • See more on Amazon...

Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Amazon Price: $21.49 | as of 04/22/2019(6:19pm pst)
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  #10

Time Delay Relay,Off Delay Time Relay, Mini Power Off Delay Time Relay,for 35mm Din Rail, AC/DC 12V~240V

 Ean: 0748018856973   |    PartNumber: Jectse54q9726ndx   |   Asin: B07QG2WHN6

Features:
1. This is a single function power-off delay relay and time delay can be set by panel knob.
2. Super wide time delay range of 0.1s - 10days.
3. With AC/DC 12V-240V working voltage.
4. Relay working status is indicated by LED indicators.
5. With super small volume, this relay can be mounted on 35mm DIN rail.

Specification:
Function: Delay OFF
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 x SPDT, 16A/AC1, 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. 74g/2.6oz

Package list:
1 * Off Delay Time Relay

Features

  • This is a single function power-off delay relay and time delay can be set by panel knob.
  • Super wide time delay range of 0.1s - 10days.
  • With AC/DC 12V-240V working voltage.
  • Relay working status is indicated by LED indicators.
  • With super small volume, this relay can be mounted on 35mm DIN rail.
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Brand: Jectse   |   Manufacturer: Jectse

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

Amazon Price: $18.49 | as of 04/22/2019(6:19pm pst)
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  #11

3 Phase Voltage Monitoring Relay JVRD-380W Adjustable Circuit Voltage Protector Three Phase Over Under Voltage Monitoring Relay 35 MM Rail 304-361VAC 399-456VAC

 Ean: 0748018528368   |    PartNumber: YWBL-WHbcwv3xzhq0   |   Asin: B07QFRCGLZ

Features:
1. Standard modular construction, rail mounted, no additional auxiliary power required.
2. The overvoltage and undervoltage value is independently adjustable and the action time is adjustable.
3. 2 sets of normally open normally closed contacts, 5 indicators indicate various working conditions.
4. Overvoltage, undervoltage, phase error, phase loss, voltage imbalance and other protection functions, zero line disconnection fault monitoring function.
5. Used in electric motors, fans, water pumps, air compressors, cranes, driving, lifts, elevators, machine tools, central air conditioners, refrigeration equipment, industrial control systems, etc.
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

Features

  • PRODUCT NAME---3 Phase Voltage Monitoring Relay; Rated voltage: 380VAC 50/60Hz; Overvoltage setting: 399-456VAC; Undervoltage setting: 304-361VAC; Voltage setting range: 5%- 20%; Contact Capacity: 250V/AC 6A; Installation method: 35mm rail
  • MAIN FEATURES---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
  • MULTI-FUNCTION---The 3 phase voltage monitoring relay could provide overvoltage, undervoltage, phase error, phase loss, voltage imbalance and other protection functions, zero line disconnection fault monitoring function
  • WIDE APPLICATION---The 3 phase voltage monitoring relay is widely used in electric motors, fans, water pumps, air compressors, cranes, driving, lifts, elevators, machine tools, central air conditioners, refrigeration equipment, industrial control systems, etc
  • NO ADDITIONAL POWER REQUIRED---With standard modular construction, 35mm rail mounted, the 3 phase voltage monitoring relay needs no additional auxiliary power
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Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Amazon Price: $25.19 | as of 04/22/2019(6:19pm pst)
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  #12

GRV8-03 Three Phase Voltage Monitoring Phase Failure IP20 Protection Relay Phase Sequence(M265)

 Ean: 0747333994094   |    PartNumber: YWBL-WH0dku57rpxa-02   |   Asin: B07Q7YYR86

Specification:
Condition: 100% Brand New
Model: GRV8-03
Monitoring Terminal: L1-L2-L3
Power Supply: L1-L2
Rated Working Voltage Selection: AC220-230-240-380-400-415-440-460(P-P)
Measuring Frequency Range: 50/60Hz
Measuring Range: 176V-552V
Voltage Threshold Range: 2%-20% (Rated Voltage)
Unbalance Threshold Range: 5%-15%
Voltage Fixed Lag Rate: 2%
Power Indicator: Green LED
Action Delay Time: 0.1s-10s Adjustable
Voltage Measurement Error: 1%
Power-On Delay Time: 0.5s
Knob Setting Accuracy: 1%
Reset Time: 1s
Temperature Fluctuation Error: 0.05%C, at=20C
Output: 1 x SPDT 10A/AC250VAC
Minimum Switching Power: 500mW
Output Relay Indication: Red LED
Mechanical Life: 10000000
Electrical Life (Resistive Load): 1000000
Storage and Transportation Environment Temperature: -35 -75
Installation Method: 35mm Rail Installation
Protection Level: IP20
Installation Altitude: 2000 Meters
Pollution Degree: 2
Wiring Capacity: 1x2.5mm2 or 2x 1.5mm2
Optional Style: M460, M265
Weight: Approx. 76g / 2.7oz
Size: Approx. 90 * 18 * 64mm / 3.5 * 0.7 * 2.5in

Package List:
1 * Monitoring Relay

Features

  • This monitoring relay can monitor own working voltage.
  • 8 kinds of rated voltages are adjustable, can apply to voltages in all regions of the world
  • The working status of the relay is indicated by the LED indicator
  • Ultra-small size and it is easy to install.
  • It is applied to mobile device connection control, causing accidents in equipment protection against reverse operation, normal/emergency power switch, preventing phase failure of power load.
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Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Amazon Price: $15.99 | as of 04/22/2019(6:19pm pst)
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  #13

WAL FRONT TG30 3-Phase Phase Sequence Relay Phase Failure Loss Protection 220-380VAC

 Ean: 0724942617125   |    PartNumber: Walfronta5r1kvxp3o   |   Asin: B07Q6VC1VY

Characteristics of working:
1. If the connection of L1, L2 and L3 phases are right, the green light of the relay illuminates and the relay closes. If they are wrong, the yellow light of the relay illuminates. Exchanging any two of them, the relay will accept the phase sequence and begin to work normally.
In this case that there occurs yellow light illuminated and relay unclosed after the protected equipment works normally, it should be a wrong connection of external circuit. The relay has a function of protection against wrong connection.
2. While any of these L1, L2 and L3 phases is phase loss, the red light is lighted with the unlighted green light and the released relay. While the voltage come back to normal, it will recover immediately with lighted green light and closed relay.
3. L1, L2 and L3 connect with three phase AC. NO, COM are normally open contact point and NC, COM are normally closed contact point. Use lead to connect terminal directly.



Specification:

Model: TG30

Rated voltage: 220-380VAC

Rated current: 5A

Power consumption: 2W

Insulation voltage: 40000VCC/m

Mounting method: 35mm TH type rail or M2-M4 screws

Package weight: Approx. 98g/3.4oz



Package list:

1 * Phase Sequence Relay

Features

  • In the reverse phase (anti-phase), three-phase voltage imbalance, phase loss and short-circuit when the inductive load such as motor is running, it can quickly judge and output the relay protection, and its protection function is not affected by the circuit or load current, surge current, unbalanced current and load characteristics, achieving long-term operation of full performance and full climate to ensure normal and stable operation of the motor.
  • Phase loss protection: It means that any phase occurs phase loss when the protected circuit is in running or stopping status. In this case, the red indicator light will be lighted and be priority.
  • Phase reversal protection: It is a safeguard acting immediately, which protects L1, L2, and L3 three phase against wrong connection sequence. In this case, the yellow indicator light will be lighted. Delay protection: When the fault happens, the monitor will delay 1~3 seconds to act and release.
  • Voltage imbalance protection: While a protection of voltage imbalance rate > 50%, the imbalance of three phase voltage will affect the safe running of the equipment. In this case that there is a phase losing, the red indicator light will be lighted and be priority.
  • It can be used to provide relay protection for various three-phase motors and other three-phase equipment such as refrigeration compressor, pump, fan, air compressor, elevator, injection molding machine.
  • See more on Amazon...

Brand: WAL FRONT   |   Manufacturer: WAL FRONT

Item Dimensions: 1.18 x 2.56 x 2.95 inches (3.0 x 6.5 x 7.5 cm)   |   

Amazon Price: $14.99 | as of 04/22/2019(6:19pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $14.99

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  #14

H3Y-4 Time Relay Pointer Control Delay Timer Control Switch 14-Pin 24VDC AC250V 5A Resistive(30S)

 Ean: 0703633149985   |    PartNumber: YWBL-WHk6v3qzcupt-03   |   Asin: B07Q4MKTBR

Specification:
Condition: 100% Brand New
Material: Plastic
Model: H3Y-4
Contact Load: Medium-power
Contact Switching Current: 5A
Contact Switching Voltage: 1V
Rated Current: 5A
Rated Voltage: 24V
Protective Characteristics: Seal Type
Coil Power Supply: 24V
3C Rated Voltage Range: Below 36V
Contact Capacity: AC250V 5A Resistive
Time Delay Error: 10%
Working Mode: Electricity Delay
Number of Terminals: 14 pins
Package Size: Approx. 6.5 * 3 * 2.5cm/2.6 * 1.2 * 1inch
Optional Type: 6S, 10S, 30S, 60S
Package Weight: Approx. 43g

Package list:
1 * Time Relay

Features

  • Premium pins for good electricity conductivity.
  • Stable performance, long service life.
  • High delay accuracy and strong anti-interference.
  • Easy and convenient for install.
  • Widely applied to automatic control, remote control, communication, mechatronics and so on.
  • See more on Amazon...

Brand: YWBL-WH   |   Manufacturer: YWBL-WH

Item Dimensions: 0.98 x 1.18 x 2.56 inches (2.5 x 3.0 x 6.5 cm)   |   

Amazon Price: $8.19 | as of 04/22/2019(6:19pm pst)
Availibility:
List Price:

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