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Best Voltage Monitoring Relays - Buying Guide

Last Updated: 06/18/2019

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Bestselling Voltage Monitoring Relays on Amazon

  1. Icstation 3V 1 Channel Relay Power Switch Module with Optocoupler High Level Trigger for ESP8266 Dev...
  2. Functional Devices RIBU2C Enclosed Pilot Relay, 10 Amp 2 Spdt with 10-30 Vac/Dc/120 Vac Coil
  3. Symcom MotorSaver 3-Phase Voltage Monitor, Model 250A, 190-480V, DPDT Contacts
  4. Hubbell Wiring Systems HBL2711SW Twist-Lock Watertight Safety Shroud Male Plug, 30 amp, 125/250VAC, ...
  5. SymCom MotorSaver 3-Phase Voltage Monitor Model 201A, 190-480V, 8-Pin Octal Base
  6. SymCom MotorSaver 3-Phase Voltage Monitor, Model 460-L, 190-480V, Fixed Unbalance and Trip Delay, DI...
  7. SymCom 102A Motor Saver 3-Phase Monitor Relay 190-480VAC
  8. Hubbell Wiring Systems HBL2731SW Twist-Lock Watertight Safety Shroud Male Plug, 30 amp, 3-Phase 480V...
  9. GRV8-01 Single Phase Monitor Relay, Keenso Adjustable Voltage Monitoring Relay Over Voltage Protecti...
  10. Eagles 5pcs 1 Channel 3V Relay Module with Optocoupler for ESP8266 Module 3v Logic Level Boards Rasp...

  #1

Icstation 3V 1 Channel Relay Power Switch Module with Optocoupler High Level Trigger for ESP8266 Development Board (Pack of 5)

Model: 3V 1 channel Relay Module   |    Mpn: 356705   |    PartNumber: 356705   |   Asin: B01M0E6SQM


Specifications:
Relay Module: SRD-DC03V-SL-C
Channel: 1 channel
Working Voltage: DC 3-3.3V
Compatible Load: 10A 250VAC / 10A 30VDC
Single Socket Length:7.5mm
Response Time:

Features

  • Please ask seller a question if you have any question about product or shipping, at this page - https://www.amazon.com/hz/help/contact/A243HB0NZWY05K
  • 1 channel 3V/3.3V power relay mdoule support photocoupler isolation control. Support dual power supply input ensure high anti-iinterference ability
  • Fast response time less than 20ms and longlife time up to 100,000 times snap action
  • On-board signal output indicator, wire terminal and installing holescompatible with 10A 250VAC and 10A 30VDC load. Module Size: 70mmX17mmX20mm/2.76X0.70X0.79inch(L*W*H)
  • Tips: when the jumper cap connected, the relay working power supply will also as the signal power supply, when not connected, the relay and signal power supply is isolated.
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Brand: IS   |   Manufacturer: Icstation

Item Dimensions: 0.79 x 0.7 x 2.76 inches (2.0 x 1.8 x 7.0 cm)   |   Package Dimensions: 1.18 x 5 x 7.01 inches (3.0 x 12.7 x 17.8 cm)

Amazon Price: $11.99 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 1-2 business days
List Price: $18.99

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  #2

Functional Devices RIBU2C Enclosed Pilot Relay, 10 Amp 2 Spdt with 10-30 Vac/Dc/120 Vac Coil

Model: RIBU2C   |    Mpn: RIBU2C   |    Ean: 0616913184128   |    PartNumber: RIBU2C   |   Asin: B0078RYY00

10 amp 2 SPDT, 10-30 VAC/DC/120 VAC coil, sold as each, Functional Devices RIBU2C enclosed pilot relay, 10 amp 2 SPDT with 10-30 VAC/DC/120 VAC coil. Made in United States. Manufactured by Functional Devices, Inc.

Features

Brand: Functional Devices   |   Manufacturer: Functional Devices, Inc

Item Dimensions: 1.8 x 3.8 x 2.5 inches (4.6 x 9.7 x 6.4 cm)   |   Package Dimensions: 2.5 x 4.4 x 6.5 inches (6.4 x 11.2 x 16.5 cm)

First Available: 2017-06-13

Amazon Price: $19.12 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 24 hours
List Price: $20.75

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  #3

Symcom MotorSaver 3-Phase Voltage Monitor, Model 250A, 190-480V, DPDT Contacts

Model: 250A   |    Mpn: 250A   |    PartNumber: 250A   |   Asin: B0176L8N4A

SymCom MotorSaver model 250A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically selects between the 200V and 400V range. This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the MotorSaver's output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels. The Model 250A includes advanced single LED diagnostics. Five different light patterns distinguish between faults and normal conditions.

Features

  • Low voltage, high voltage trip, single-phase trip, reverse-phase trip, Fixed 6% voltage unbalance trip
  • Single LED diagnostics, adjustable restart delay, manual reset selection, DPDT relay output
  • Separate indicators for, power-up restart delay, reverse-phase trip, good voltage/relay energized, unbalance/single-phase trip, high/low voltage trip
  • UL, CSA and CE approved
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Brand: Symcom   |   Manufacturer: Littelfuse

Item Dimensions: 2.93 x 5.27 x 2.95 inches (7.4 x 13.4 x 7.5 cm)   |   Package Dimensions: 4.76 x 4.84 x 7.05 inches (12.1 x 12.3 x 17.9 cm)

Amazon Price: $136.00 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 1-2 business days
List Price: $136.00

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  #4

Hubbell Wiring Systems HBL2711SW Twist-Lock Watertight Safety Shroud Male Plug, 30 amp, 125/250VAC, 3-Pole, 4-Wire Grounding, L14-30P, Black/White

Model: HBL2711SW   |    Mpn: HBL2711SW   |    Ean: 0783585231761   |    PartNumber: HBL2711SW   |   Asin: B00IL65DAM

Hubbell watertight safety shroud male plug. Alignment arrows and lock and unlock symbols provide a visual indication that devices are properly connected. Cord grip screw recess minimizes screwdriver slippage. One-step automatic Neoprene sealing gland and engineered thermoplastic guard assure sealing when device is fully connected. Blades are recessed for protection against bending and breaking. External keying provides quick mating of devices. 30-ampere current rating. 23/64-inches to 15/16-inches cord diameter.

Features

  • Alignment arrows and lock and unlock symbols provide a visual indication that devices are properly connected
  • Cord grip screw recess minimizes screwdriver slippage
  • One-step automatic Neoprene sealing gland and engineered thermoplastic guard assure sealing when device is fully connected
  • Blades are recessed for protection against bending and breaking
  • External keying provides quick mating of devices
  • See more on Amazon...

Brand: Hubbell Wiring Systems   |   Manufacturer: Hubbell

Package Dimensions: 3.6 x 4.2 x 5.3 inches (9.1 x 10.7 x 13.5 cm)

Amazon Price: $121.27 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 2-3 business days
List Price: $111.00

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  #5

SymCom MotorSaver 3-Phase Voltage Monitor Model 201A, 190-480V, 8-Pin Octal Base

Model: 201A   |    Mpn: CRESCENT ENTERPRISES-62   |    Ean: 0696505439607   |    PartNumber: CRESCENT ENTERPRISES-62   |   Asin: B0176L8HBE

Littelfuse #201A - 3-PHASE PLUG-IN VOLTAGE MONITO

Features

Brand: Symcom   |   Manufacturer: Littelfuse

Item Dimensions: 1.75 x 2.37 x 4.13 inches (4.4 x 6.0 x 10.5 cm)   |   Package Dimensions: 3.4 x 3.5 x 5.8 inches (8.6 x 8.9 x 14.7 cm)

Amazon Price: $75.67 | as of 06/18/2019(10:46am pst)
Availibility:
List Price: $75.67

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  #6

SymCom MotorSaver 3-Phase Voltage Monitor, Model 460-L, 190-480V, Fixed Unbalance and Trip Delay, DIN Rail Mount

Model: 460-L   |    Mpn: 460-L   |    PartNumber: 460-L   |   Asin: B0176L88YK

Littelfuse #460-L - 3-PHASE VOLT MON/ 190-480V/ AD

Features

Brand: Symcom   |   Manufacturer: Littelfuse

Item Dimensions: 3.5 x 2.08 x 2.35 inches (8.9 x 5.3 x 6.0 cm)   |   Package Dimensions: 2.5 x 2.5 x 4.2 inches (6.4 x 6.4 x 10.7 cm)

Amazon Price: $110.00 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 24 hours
List Price: $110.00

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  #7

SymCom 102A Motor Saver 3-Phase Monitor Relay 190-480VAC

Model: 102A   |    Mpn: 102A   |    PartNumber: 102A   |   Asin: B00RW7LYC2

SymCom MotorSaver Model 102A is an auto-ranging voltage monitor designed to protect 3-phase motors regardless of size. It is used on 190-480 VAC, 50 to 60 Hz motors to prevent damage caused by single phasing, low voltage, phase reversal, or voltage unbalance. This unique microcontroller-based voltage and phase-sensing circuit constantly monitors the three-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the MotorSaver's output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time (Restart Delay). The trip delay prevents nuisance tripping due to rapidly fluctuating power line conditions.

Features

  • Protects Motors from loss of any phase (single-phasing), low voltage, voltage unbalance and phase reversal.
  • Surface Mount with, Optional DIN Rail Mount, Compact design, Finger-safe Barrier Strip Cover
  • Microcontroller-based circuitry provides better accuracy and higher reliability. Transient protection meets IEEE 587 and IEC standards and permits operation under tough conditions.
  • Universal range from 190-480 VAC, 50/60 Hz, provides the versatility needed to handle global applications.
  • UL and cUL listed, 5-year warranty, Assembled in USA
  • See more on Amazon...

Brand: Symcom   |   Manufacturer: Littelfuse

Item Dimensions: 23 x 23 x 31 inches (58.4 x 58.4 x 78.7 cm)   |   Package Dimensions: 4.9 x 4.9 x 7.1 inches (12.4 x 12.4 x 18.0 cm)

Amazon Price: $129.50 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 1-2 business days
List Price: $129.50

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  #8

Hubbell Wiring Systems HBL2731SW Twist-Lock Watertight Safety Shroud Male Plug, 30 amp, 3-Phase 480VAC, 3-Pole, 4-Wire Grounding, L16-30P, Black/White

Model: HBL2731SW   |    Mpn: HBL2731SW   |    Ean: 0783585231921   |    PartNumber: HBL2731SW   |   Asin: B000LDBRJY

Hubbell watertight safety shroud male plug. Alignment arrows and lock and unlock symbols provide a visual indication that devices are properly connected. Cord grip screw recess minimizes screwdriver slippage. One-step automatic Neoprene sealing gland and engineered thermoplastic guard assure sealing when device is fully connected. Blades are recessed for protection against bending and breaking. External keying provides quick mating of devices. 30-ampere current rating. 11/32-inches to 5/32-inches cord diameter.

Features

  • Alignment arrows and lock and unlock symbols provide a visual indication that devices are properly connected
  • Cord grip screw recess minimizes screwdriver slippage
  • One-step automatic Neoprene sealing gland and engineered thermoplastic guard assure sealing when device is fully connected
  • Blades are recessed for protection against bending and breaking
  • External keying provides quick mating of devices
  • See more on Amazon...

Brand: Hubbell Wiring Systems   |   Manufacturer: Hubbell

Package Dimensions: 3.6 x 3.8 x 5.5 inches (9.1 x 9.7 x 14.0 cm)

Amazon Price: $110.38 | as of 06/18/2019(10:46am pst)
Availibility:
List Price: $111.00

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  #9

GRV8-01 Single Phase Monitor Relay, Keenso Adjustable Voltage Monitoring Relay Over Voltage Protection AC/DC Voltage Monitoring Relay A220V/ D12V/ AD48V/ AD240V (GRV8-01(D12))

 Ean: 0747333784107   |    PartNumber: Keenso9ghqz758e2-02   |   Asin: B07QFLFJQH

Keenso GRV8-01 Monitor Relay Single Phase Voltage Monitoring Relay AC/DC Voltage Monitoring

Note:
Please read the relevant parameter information carefully to choose the Type you want before purchase!
100% test before shipping, fast money refund & new replacement! We provide 100% perfect customer service, please contact us if there is ANY problem!

Specification:
Voltage monitoring
Power terminal (monitoring terminal): A1(+)-A2(-)
Rated power supply voltage (Optional):
#1: AC220V

#2: DC12V
#3: AC/DC24V-48V
#4: AC/DC110V-240V
Rated power frequency: 45Hz-65Hz
Rated insulation voltage: 460V
Hysteresis value: 5%-20%
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 / 24VDC
Minimum switching power: 500mW
Mechanical life: 1 * 10000000
Electrical life (resistive 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

Package list:
1 * Phase Voltage Monitoring Relay
1 * User manual

Features

  • Effective & Accurate monitoring -- This GRV8-01 Single Phase Monitor Relay mainly used to monitor the working voltage(true RMS measurement). 100% High accuracy, voltage measurement accuracy is 1%.
  • Super Function -- Apply to over voltage protection for electrical equipment or compressors, emergency/backup power switching control. 100% safe and practical AC/DC Monitor Relay.
  • Compact & Practical -- GRV8-01 Monitoring Relay in professional design, compact size, only 18mm width, 35mm rail mounting. Portable and practical for you to operate!
  • Built-in LED Display -- With built-in LED indicator, you can easily get the working status of the relay is indicated, very simple and convenient to use. The operating mode can be selected via the rotary knob.
  • Keenso Service -- 100% test before shipping, fast money refund & perfect customer service! If You Have Any Questions, Just Connect Us By QA & E-Mail.
  • See more on Amazon...

Brand: Keenso   |   Manufacturer: Keenso

Amazon Price: $32.99 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 1-2 business days
List Price: $32.99

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  #10

Eagles 5pcs 1 Channel 3V Relay Module with Optocoupler for ESP8266 Module 3v Logic Level Boards Raspberry Pi 3.3v Application

 Ean: 0782321857845   |    PartNumber: Relay-5   |   Asin: B07GBS62GX

Discription:
1. Voltage: DC 3v/3.3v
2. Size: 2.7"/70mm X 0.66"/17mm X 0.79"/20mm
3. Main components: EL817, Srd-dc03v-sl-c
4. Can control 10A 250VAC, 10A 30VDC load

Feature
1. The relay module has the output signal indicator light indication;
2. The signal input port can connect SCM IO port, high level signal drive;
3. Dual power supply design with anti-interference ability and high reliability of photoelectric isolation protection ;
4. With diode continuous flow protection;
5. Response time is less than 20 milliseconds;
6. Long life of relay can be absorbed 100,000 times continuously;
7. The external connection uses the Rotary crimping terminal, causes the wiring to be more solid;
8. With fixed installation hole, easy to install. Provide circuit diagram and detailed instructions for use.

Package include:
5 x 1 Channel Relay Module with Optocoupler

Features

  • 1. 3V 1-Channel Relay interface board support photocoupler isolation control,has the output signal indicator,the signal input port can connect SCM IO port, high level signal drive
  • 2. Support dual power supply input ensure high anti-interference ability,high reliability of photoelectric isolation protection
  • 3. With diode continuous flow protection,response time is less than 20 milliseconds,long life of relay can be absorbed 100,000 times continuously
  • 4. The external connection uses the rotary crimping terminal, causes the wiring to be more solid.
  • 5. Equiped with high-current relay, AC250V 10A ; DC30V 10A,each relay has normally open and normally closed contact. Can be selected by jumper relay and TTL or ground.
  • See more on Amazon...

Brand: Eagles   |   Manufacturer: Eagles

Package Dimensions: 1.3 x 3.7 x 5.4 inches (3.3 x 9.4 x 13.7 cm)

Amazon Price: $15.99 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 24 hours
List Price: $15.99

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  #11

Hubbell Wiring Systems HBL2311SW Twist-Lock Watertight Safety Shroud Male Plug, 20 amp, 125VAC, 2-Pole, 3-Wire Grounding, L5-20P, Black/White

Model: 191601   |    Mpn: HBL2311SW   |    Ean: 0783585231020   |    PartNumber: HBL2311SW   |   Asin: B00DWI9P6W

Locking Devices, Twist Lock, Watertight Safety Shroud, Male Plug,, 125V, 2-Pole 3-Wire Grounding, L5-20P, Screw Terminal, Black and White

Features

  • Alignment arrows and lock and unlock symbols provide a visual indication that devices are properly connected
  • Cord grip screw recess minimizes screwdriver slippage
  • One-step automatic Neoprene sealing gland and engineered thermoplastic guard assure sealing when device is fully connected
  • Blades are recessed for protection against bending and breaking
  • External keying provides quick mating of devices
  • See more on Amazon...

Brand: Hubbell Wiring Systems   |   Manufacturer: Hubbell

Item Dimensions: 3.4 x 3.1 x 5.2 inches (8.6 x 7.9 x 13.2 cm)   |   Package Dimensions: 3.39 x 3.7 x 5.39 inches (8.6 x 9.4 x 13.7 cm)

Amazon Price: $31.95 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 24 hours
List Price: $69.30

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  #12

Dorman HELP! 85124 Socket, Ford Elect. Reg."

Model: 85124   |    Mpn: 85124   |    Ean: 0037495851244   |    PartNumber: 85124   |   Asin: B000CO97TO

Dorman Motormite 85124 Electrical, Electrical - Sockets - Harnesses - 6 + Wire Dorman Motormite 85124 Electrical, Electrical - Sockets - Harnesses - 6 + Wire Features: Electrical - Sockets - Harnesses - 6 + Wire Type: 6-Wire Description: Ford Electronic Voltage Regulator Brand: Dorman - Conduct-Tite

Features

Brand: Dorman   |   Manufacturer: Dorman - Conduct-Tite

Item Dimensions: 1.75 x 2.75 x 4.5 inches (4.4 x 7.0 x 11.4 cm)   |   Package Dimensions: 2 x 2.8 x 4.6 inches (5.1 x 7.1 x 11.7 cm)

Amazon Price: $1.39 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 1-2 business days
List Price: $9.69

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  #13

JVR800-2 Voltage Protection Relay,Under Over Voltage Protector 3 Phase Voltage Monitoring Sequence Relay

 Ean: 0747333418897   |    PartNumber: YWBL-WH6ewt8gi2yq   |   Asin: B07Q5Z1CGM

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

Features

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

Package Dimensions: 1.9 x 2.5 x 3.4 inches (4.8 x 6.4 x 8.6 cm)

Amazon Price: $34.89 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 24 hours
List Price: $34.89

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  #14

Onyehn 1 Channel DC 3V Relay High Level Driver Module Optocoupler Relay Module Isolated Drive Control Board for Arduino (Pack of 5)

 Ean: 8431246151102   |   Asin: B07PNB86R7

- Size: 70mm X17mm X20mm (LxWxH)
- Main chip: EL817, SRD-DC03V-SL-C
- Work voltage: DC 3V/3.3V
- Control 10A 250VAC, 10A 30VDC load

Features
- Instructions with the signal output
- Signal input port can connect microcontroller IO port, high level signal
- Double power selection design anti-interference ability is strong, photoelectric isolation protection of high reliability
- Current wide detection range:DC0-25V input
- A diode current protection
- Response time is less than 20 milliseconds
- Relay long life can absorb 100000 times continuously
- External connection use spinning crimping terminal, make connection firmer
- With fixed installation hole, convenient installation

Package include
5 X 1 Channel 3V Relay Module

Features

  • 1 channel 3V/3.3V power relay mdoule support photocoupler isolation control;Support dual power supply input ensure high anti-iinterference ability
  • Fast response time less than 20ms and longlife time up to 100,000 times snap action
  • On-board signal output indicator, wire terminal and installing holescompatible with 10A 250VAC and 10A 30VDC load
  • Module Size: 70mmX17mmX20mm / 2.76X0.70X0.79 inch (L*W*H)
  • Relay Module: SRD-DC03V-SL-C;Channel: 1 channel;Working Voltage: DC 3-3.3V;Compatible Load: 10A 250VAC / 10A 30VDC;Single Socket Length: 7.5mm
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Brand: Onyehn   |   Manufacturer: Onyehn

Package Dimensions: 0.9 x 3.9 x 6.5 inches (2.3 x 9.9 x 16.5 cm)

Amazon Price: $15.99 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 24 hours
List Price: $15.99

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  #15

WHDTS 4 Channel WiFi Momentary Inching/Self-Locking/Interlocking Relay Delay Switch Module Smart Home Remote Control AC 220V Compatible with Alexa Google Assistant iOS Andriod 2G/3G/4G Network

 Ean: 6165438537505   |   Asin: B07HKBRG6V

Parameters:



Working voltage: AC 85~250V Load voltage: AC 85-250V Load current:10A/channel(max) WIFI standard:2. 4GHz b/g/n Operating Temperature:-20 ~70 Operating Humidity:5%-90%RH



1. Change work mode:



The default is self-lock mode.



The LED corresponding to the work mode will turn ON when press button 'Mode'.



M1:Red LED indicator. Self-locking mode;



M2:Blue LED indicator. Inching mode;



M3:Green LED indicator. Interlocking mode.



2. Self-locking mode:



Control each output separately. 4-Channel output relay work independently of each other.



For example

if users turn on CH1, connected device keeps on. If users turn off CH2, connected device keeps off.



press button CH1, CH1 relay will keep on;Press again, CH1 relay OFF.



3. Inching mode:



Control each output separately. 4-Channel output relay work independently of each other.



Users can turn on the connected devices for 1s.



4. Interlocking mode:



The 4 outputs are related to each other, only one output can work at a time. Users can turn on 1 device every time, and turn off other devices at the same time.



More details:images-na. ssl-images-amazon. com/images/I/91uIjaEt7lL. pdf




Drivers for mac osx: macappstore. org/silicon-labs-vcp-driver/

Features

  • 4 CHANNEL: 4 channel smart remote control module which you can control your 4 home appliances independently.
  • 3 WORKING MODES (Inching/Self-locking/Interlocking): M1 for Self-locking, M2 for Inching and M3 for Interlocking.
  • 3 REMOTE CONTROL METHODS: you can control the connected appliances via free phone application eWelink or manually with buttons on the module.
  • Input AC voltage(85V to 250V) powers the module and is independently swithched on 4 output channels
  • The eWelink application supports Amazon Alexa, Google Assistant and Google Nest
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Brand: WHDTS   |   Manufacturer: WHDTS

Package Dimensions: 1.69 x 3.78 x 4.8 inches (4.3 x 9.6 x 12.2 cm)

Amazon Price: $24.99 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 24 hours
List Price: $39.99

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  #16

Time Mark Corporation A257B Relay; SSR; Phase Monitor; SPDT; Cur-Rtg 10A; Ctrl-V 240AC; Vol-Rtg 480AC; Socke

 PartNumber: D341019-A257B   |   Asin: B00DWIMLHC

Dimensions : 1.7 x 2.44 x 3.52 in. Electrical Phase : 3 Height : 3.52 in. Length : 1.7 in. Maximum Operating Temperature : 131 F Maximum Voltage Sensed : 480 V Minimum Operating Temperature : -20 F Minimum Voltage Sensed : 380 V Monitoring Application : Phase, Voltage Mounting Type : Socket Number of Poles : 1 Operating Temperature Range : -20 to +131 F Phase Sensitivity : Phase Loss, Phase Reversal Series : 257 Special Features : Automatic or Manual Reset Standards Met : CSA, UL Supply Voltage : 480 VAC Terminal Type : Plug-In Time Delay : 50 ms Voltage Sensing Range : 380 to 480 V Voltage Sensitivity : Low Voltage Width : 2.44 in.

Features

Brand: TIME MARK   |   Manufacturer: TIME MARK

Item Dimensions: 4 x 4.63 x 6.5 inches (10.2 x 11.8 x 16.5 cm)   |   Package Dimensions: 2.01 x 2.6 x 4.37 inches (5.1 x 6.6 x 11.1 cm)

Amazon Price: $95.00 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 24 hours
List Price: $23.11

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  #17

SymCom MotorSaver Heavy Duty 3-Phase Voltage Monitor, Model 355-200, 190-240V

Model: 355-200   |    Mpn: 355-200   |    PartNumber: 355-200   |   Asin: B0176L8CLE

SymCom MotorSaver Model 355-600 is a 3-phase voltage monitor, perfect for heavy-duty applications that need both protection and diagnostics while the motor is shut down. Applications include rural pump panels, commercial HVAC equipment, oil rigs, and rural HVAC equipment. It monitors 575 to 600V input voltages. A unique microcontroller-based voltage and phase-sensing circuit constantly monitors the 3-phase voltages to detect harmful power line conditions such as single-phasing, low voltage, high voltage, phase reversal, and voltage unbalance. When a harmful condition is detected, the MotorSaver's output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time (restart delay). The trip delay prevents nuisance tripping due to rapidly fluctuating power line conditions. It is equipped with one standard 470VA @ 600V contact. The Model 355-400 and 355-600 can be ordered with15A general purpose contacts to switch heavier current loads. UL and cUL listed, 5-year warranty, Made in USA

Features

  • Protects Motors from loss of any phase (single-phasing), low voltage, voltage unbalance, phase reversal and high voltage.
  • Single-phase conditions are detected regardless of regenerated voltage.
  • The microcontroller-based circuit provides better accuracy and higher reliability than analog designs.
  • Standard surface mount, Opt. DIN rail mount,
  • Standard manual 2-300 sec. adj. restart delay, Standard 2-8% adj. voltage unbalance trip point
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Brand: Symcom   |   Manufacturer: Littelfuse

Item Dimensions: 2.9 x 5.25 x 2.91 inches (7.4 x 13.3 x 7.4 cm)   |   

Amazon Price: $301.05 | as of 06/18/2019(10:46am pst)
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  #18

3 Phase Monitor Relay, SPDT, 500VAC, 8 Pin

 PartNumber: PMPU-FA8B18   |   Asin: B00VJL76E2

Dayton's Three-Phase Monitor Relay continuously monitors all voltages of a 190-500V three-phase system. Relay is used to protect motors and equipment from expensive damage due to phase loss, phase reversal, phase unbalance, undervoltage and overvoltage faults, as well as rapid cycling. Detects single phasing and unbalanced voltages regardless of regenerative voltages. Unlike similar three-phase monitor relays, this product will continue to function even with a lost phase. This relay is the only line-powered units in their class to retain fault indication and continuous monitoring of all voltages during a phase loss, increasing the ease of troubleshooting and the level of protection. Phase Monitor Relay, 190-500VAC, Plug, SPDT

Brand: Dayton   |   Manufacturer: Macromatic

Item Dimensions: 1.88 x 2.5 x 4.25 inches (4.8 x 6.4 x 10.8 cm)   |   

Amazon Price: $67.34 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 2-3 business days
List Price: $67.34

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  #19

LM YN Digital Voltage Comparator 0-100V Voltage Measurement Control Voltage Measuring / Charge Discharge Protection / Overvoltage / Undervoltage / Overload Protection 12V

 Ean: 0603983633151   |   Asin: B01M1JEH7T

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.

Features

  • 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
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Brand: LM YN   |   Manufacturer: LM YN

Package Dimensions: 0.2 x 3.5 x 6 inches (0.5 x 8.9 x 15.2 cm)

Amazon Price: $13.80 | as of 06/18/2019(10:46am pst)
Availibility: Usually ships in 24 hours
List Price: $13.80

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