14 best phase monitoring relays

Product description

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

User questions & answers

Question:	What is the diference between this one and the 201A
Answer:	I believe the "-9" has more options. Reset time, trip time, and something else.

Product description

Phase monitoring relay

Product description

Features:

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

Specifications:

Model: DPA51CM44

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

Rated current: 5A

Rated voltage: 208-480VAC

Protective features: IP20

3C rated voltage range: below 36V

Measuring range: 208-480VAC

Contact switching voltage: 250V

Contact switching current: 5A

Output: 1*SPDT relay

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

Electrical life: > 100,000 times

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

Package Included:

1 x 3-Phase Monitoring Relay

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

User questions & answers

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

Product description

Specification:

Function

Voltage monitoring

Power terminal (monitoring terminal)

A1(+)-A2(-)

Rated power supply voltage (Optional)

#1: AC220V

#2: DC12V

#3: AC/DC24V-4

#4: AC/DC110V-240V

Rated power frequency

50/60Hz

Rated insulation voltage

460V

Hysteresis value

3% fixed

Power indicator

Green LED

Output relay indication

Red LED

Action delay time

0.1s-10s, 10%

Voltage measurement error

≤1%

Power-on delay time

0.5s

Knob setting accuracy

1%

Reset time

1s

Temperature fluctuation error

0.05%/°C, at=20°C

Output

1 * SPDT

10A/AC1

250VAC

Minimum switching power

500mW

Mechanical life

1 * 10000000

Electrical life (resistance load)

1 * 1000000

Working environment temperature

-20°C- +55°C

Storage and transportation ambient temperature

-35°C- +75°C

Installation method

35mm rail installation

Protection level

IP20

Installation location

Any

Installation altitude

≤2000m

Pollution degree

2

Wiring ability

1 * 2.5mm2 or 2 * 1.5mm2

Dimensions

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

Standard

GB14048.5,

IEC/EN 60225-1



Package list:

1 * Relay

1 * User manual

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

Product description

Features:

Anti-interference: DPA51CM44 3-Phase monitoring relay features strong anti-interference performance. Convenience: Voltage monitoring relay with compact size and convenient for installation. Good performance:This monitoring relay phase maintains constant and efficient work of the motor. Scope of application: Phase sequence protector widely used in motor protection, elevator, air conditioning system, power system and other industries. 3-phase monitoring relay for phase sequence and phase loss. Functional purpose: Detects when all phases are present and have the correct sequence.

Specifications:

Model: DPA51CM44

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

Rated current: 5A

Rated voltage: 208-480VAC

Protective features: IP20

3C rated voltage range: below 36V

Measuring range: 208-480VAC

Contact switching voltage: 250V

Contact switching current: 5A

Output: 1*SPDT relay

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

Electrical life: > 100,000 times

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

Package Included:

1 x 3-Phase Monitoring Relay

• Anti-interference: DPA51CM44 3-Phase monitoring relay features strong anti-interference performance.
• Good performance:This monitoring relay phase maintains constant and efficient work of the motor.
• Functional purpose: Detects when all phases are present and have the correct sequence.
• Scope of application: Phase sequence protector widely used in motor protection, elevator, air conditioning system, power system and other industries.
• Convenience: Voltage monitoring relay with compact size and convenient for installation.

Product description

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

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

Product description

Features:

1. Standard modular structure, guide rail type installation.

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

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

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

5. No additional auxiliary power supply is required.

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

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

8. Fault recording function.

9. Output test function.

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

Specification:

Model: SVR1000/AD48

Optional Type: D12, AD48, AD220

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

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

Protection Function: Over-voltage, Under-voltage

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

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

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

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

Reset Time: 0.1-999s

Display: Chinese LCD

Contact Form: 1 CO & 1NC

Contact Capacity: 6A 250VAC

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

Installation: 35mm Guide Rail

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

Package List:

1 * Over-voltage Under-voltage Relay

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

Product description

Carlo Gavazzi DPA01CM60 Monitoring Relay, 3-Phase, 380-600VAC, 8A SPDT, DIN Rail Mount Specifications: Product Series: DPA Voltage: 380-600VAC Monitoring Type: Phase Phase: Three Phase Poles: SPDT Amp Rating: 8 Amp Weight - lbs.: 0.2200

• 3 PHASE
• 600 VAC
• PHASE MONITORING RELAY
• POWER CONSUMPTION 15 VA
• SPDT

Product description

Specification:

Condition: 100% Brand new

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

Protection Function: Phase failure and phase sequence

Display Mode: LED Indicates working status

Contact form: Two sets of normally open normally closed contacts

Contact Capacity: 6A AC250V (resistive)

Installation Method: 35mm Rail or device

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



Package List:

1 x Protector



Warning:

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

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

User questions & answers

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

Product description

Specification:

Model: JVR 800-2

Monitoring Circuit: L1, L2, L3

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

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

Overvoltage setting range: 200-600V

Undervoltage setting range: 150-500V

Voltage hysteresis: 1-20V

Delay time for overvoltage and undervoltage: 0.1-30s

Voltage unbalance ratio: 1-50%

Voltage unbalance hysteresis: 1-10%

Voltage unbalance delay time: 0.1-30s

Delay time for phase loss: 0.1-30s

Delay time for phase sequence: 0.1-30s

Start delay time: 0-999s

Auto reset mode: ON/OFF

Auto reset time: 0.1-999s

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

Indicators: LCD indicating voltage,current,operation status

Output contacts: 1 C/O,1NC

Contact capacity: 6A ,250VAC

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

Mounting: suitable for 35mm rail

Weight: 129g



Package List:

1 × 3 Phase Voltage Monitoring Relay

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

User questions & answers

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

Product description

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.

Product description

ABB Entrelec 1SVR 730 824 R9300 3-Phase Monitoring Relay Voltage Monitor. 3-Phase, 200-500V AC, SPDT, DIN Rail Mount. Functional Protection: Loss of any Phase, Phase Unbalance.

Product description

Specifications:



Model: DPA51CM44



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



Rated current: 5A



Rated voltage: 208-480VAC



Protective features: IP20



3C rated voltage range: below 36V



Measuring range: 208-480VAC



Contact switching voltage: 250V



Contact switching current: 5A



Output: 1*SPDT relay



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



Electrical life: > 100,000 times



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







Package Included:



1 x 3-Phase Monitoring Relay

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

Product description

Features:

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



Specification:

Protection function: over voltage, under voltage

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

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

Monitoring circuit: direct current circuit

Protection function: over voltage, under voltage

Overvoltage regulation range: 13-17v

Undervoltage adjustment range: 10-14v

Action delay range: 0.1-15s

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

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

Contact capacity: 6A 250VAC (resistivity)

Installation: 35mm guide rail

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

Weight: 200 g / 7.1 oz(approx.)



Package list:

1 × Overvoltage Undervoltage Protector

• ✈ PRODUCT NAME---Voltage Monitoring Relay; Protection function: over voltage, under voltage; Rated voltage: DC 12V/24V/36V/48V; Overvoltage regulation range: 13-17v; Undervoltage adjustment range: 10-14v; Contact capacity: 6A 250VAC (resistivity)
• ✈ REAL-TIME MONITORING---The voltage monitoring relay could achieve real-time monitoring of dc overvoltage and undervoltage faults, and over-voltage, under-voltage value, and action time can be adjusted
• ✈ MAIN FEATURES---The voltage monitoring relay is of 2 sets of normally open and normally closed contacts, 2 indicator lights indicate various working conditions, no additional auxiliary power supply is required
• ✈ 35MM GUIDE RAIL---With 35mm guide rail and standard modular structure, the voltage monitoring relay is easy to install, easy to operate
• ✈ TYPICAL APPLICATIONS---The voltage monitoring relay is typically applied in dc motor, battery,UPS power supply, dc switchgear, dc panel, industrial control system

User questions & answers

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