> Categories>Relays>Phase monitoring relay

Phase monitoring relay

Phase monitoring relays, also known as phase control relays, phase sequence relays, or phase failure relays, are essential protective devices designed to monitor three-phase power systems. These relays continuously measure parameters such as phase sequence, phase loss, phase imbalance, and undervoltage or overvoltage conditions. Typically availa...

Phase monitoring relays, also known as phase control relays, phase sequence relays, or phase failure relays, are essential protective devices designed to monitor three-phase power systems. These relays continuously measure parameters such as phase sequence, phase loss, phase imbalance, and undervoltage or overvoltage conditions. Typically available in configurations for 3P or 4P systems, they operate at standard voltages like 230V, 400V, or 690V AC, with adjustable thresholds and time delays. They feature compact DIN-rail mounting for easy integration into control panels and include LED indicators for status visualization. Common accessories include auxiliary contacts and test buttons.

These relays are widely deployed in industrial automation, HVAC systems, pump controls, compressor units, and motor protection circuits. They are installed in distribution boards, motor control centers (MCCs), and process control panels to safeguard equipment from phase-related faults that can cause motor burnout, equipment damage, or production downtime. They are also critical in renewable energy systems like wind turbines and solar inverters.

Key subcategories include phase sequence relays, phase loss relays, and multifunction phase monitoring relays. Popular article codes often follow a pattern like PMR-400-3P or PFR-230-1, where the prefix indicates the function (e.g., PMR for phase monitoring relay), followed by voltage rating and number of phases. Specific models include the PMR-400-3P for 400V systems and the PFR-230-1 for single-phase monitoring. These codes are standardized across manufacturers for easy identification.

Electric Automation Network offers express worldwide shipping and specialized engineering support for phase monitoring relays. Our engineers provide personalized assistance for selection, configuration, and troubleshooting, ensuring optimal protection for your three-phase systems. We stock a wide range of models with real-time pricing and technical documentation.

More
Number of products per page:
Order:
Manufacturer Code Reference Catalog Number Description Delivery Price

5TT3423

5TT3423

-

Direction of rotation monitor, 230 V AC 4A, With transparent cap

 		3 View Availability View Price

1SVR550826R9100

1SVR550826R9100

-

CM-PFE.2

CM-PFE.2 Phase Sec./Fault Control Relay

CM-PFE.2 Phase sequence monitoring relay 1c/o, L1-L2-L3=200-500VAC

 		2 View Availability View Price

DPC02DM48

DPC02DM48

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage and frequency monitoring Others SIZE 45 mm POWER SUPPLY RANGE 380÷415 VAC MONITORING FUNCTION Under and over voltage/frequency, phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 380÷415 VAC DELAY 2, adjustable OTHERS VLN monitoring

Three-phase control relay of max. and min. voltage, max./min. frequency, sequence and phase loss

3-phase monitoring relay for phase loss, sequence, over and undervoltage, over and underfrequency, nominal range 380-480 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing

 		3 View Availability View Price

DPC02DM49

DPC02DM49

-

MONITORED VARIABLE 3-phase AC voltage and frequency monitoring Others SIZE 45 mm POWER SUPPLY RANGE 440÷480 VAC MONITORING FUNCTION Under and over voltage/frequency, phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 440÷480 VAC DELAY 2, adjustable OTHERS VLN monitoring

Three-phase control relay of max. and min. voltage, max./min. frequency, sequence and phase loss

3-phase monitoring relay for phase loss, sequence, over and undervoltage, over and underfrequency, nominal range 440-480 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing

 		3 View Availability View Price

DPA53CM48

DPA53CM48

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others POWER SUPPLY RANGE 380÷480 VAC MONITORING FUNCTION Under voltage, phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 380÷480 VAC

Phase sequence three-phase control relay and partial AC voltage loss plus min voltage.

3-phase monitoring relay for phase loss, sequence, undervoltage, nominal range 380-480 V AC, SPDT relay output, regenerated voltage detection, 17.5 mm DIN-rail housing

 		3 View Availability View Price

DPC02DM23

DPC02DM23

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage and frequency monitoring Others SIZE 45 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Under and over voltage/frequency, phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 208÷240 VAC DELAY 2, adjustable OTHERS VLN monitoring

Three-phase control relay of max. and min. voltage, max./min. frequency, sequence and phase loss

3-phase monitoring relay for phase loss, sequence, over and undervoltage, over and underfrequency, nominal range 208-240 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing

 		3 View Availability View Price

DPA53CM23

DPA53CM23

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 17,5 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Under voltage, phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 208÷240 VAC

Phase sequence three-phase control relay and partial AC voltage loss plus min voltage.

3-phase monitoring relay for phase loss, sequence, undervoltage, nominal range 208-240 V AC, SPDT relay output, regenerated voltage detection, 17.5 mm DIN-rail housing

 		3 View Availability View Price

DPC01DM69400HZ

DPC01DM69400HZ

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 45 mm POWER SUPPLY RANGE 600÷690 VAC MONITORING FUNCTION Under and over voltage, phase sequence/loss, asymmetry, tolerance MOUTING DIN-rail INPUT RANGE 600÷690 VAC OTHERS 50-400 Hz VLN monitoring

Three-phase control relay of max. and min. voltage, sequence, loss and phase asymmetry

3-phase monitoring relay for phase loss, sequence, asymmetry, tolerance, over and undervoltage, nominal range 600-690 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing

 		3 View Availability View Price

DPA71DM48

DPA71DM48

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 1, fixed MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 380÷480 VAC MONITORING FUNCTION Phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 380÷480 VAC OTHERS Regenerated voltage detection

Three-phase control relay of sequence and total or partial phase breakage, Power supply 380 to 480 VAC

3-phase loss and sequence monitoring relay, nominal range 380-480 V AC, DPDT relay outputs, regenerated voltage detection, 35.5 mm DIN-rail housing

 		3 View Availability View Price

PPB02CM23

PPB02CM23

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Asymmetry, phase sequence/loss MOUTING Plug-in INPUT RANGE 208÷240 VAC DELAY 1, adjustable OTHERS VLN monitoring

Three-phase phase sequence, loss and asymmetry control relay, Undecal Base Mount

3-phase monitoring relay for phase loss, sequence, asymmetry, nominal range 208-240 V AC, delay on alarm 0.1-30 s, SPDT relay output, regenerated voltage detection, 36 mm plug-in housing

 		3 View Availability View Price

DPA71DM23

DPA71DM23

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 1, fixed MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 208÷240 VAC OTHERS Regenerated voltage detection

Three-phase control relay of sequence and total or partial phase breakage, Power supply 208 to 240 VAC

3-phase loss and sequence monitoring relay, nominal range 208-240 V AC, DPDT relay outputs, regenerated voltage detection, 35.5 mm DIN-rail housing

 		3 View Availability View Price

PPB01CM48NW4

PPB01CM48NW4

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 380÷415 VAC MONITORING FUNCTION Under and over voltage, phase sequence, phase loss MOUTING Plug-in INPUT RANGE 380÷415 VAC DELAY 1, adjustable OTHERS VLN monitoring power supply between L and N

Three-phase, three-phase control relay with neutral, TRMS, Power supply 380 to 415 VAC

3-phase monitoring relay for phase loss, over or undervoltage, nominal range 380-480 V AC, delay on alarm 0.1-30 s, SPDT relay output, 36 mm plug-in housing

 		3 View Availability View Price

DPA01DM23

DPA01DM23

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 1, fixed MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 208÷240 VAC OTHERS Regenerated voltage detection

Control relay phase sequence and break phases, Output DPDT, Power supply 208 to 240 VAC

3-phase loss and sequence monitoring relay, nominal range 208-240 V AC, DPDT relay outputs, regenerated voltage detection, 22.5 mm DIN-rail housing

 		3 View Availability View Price

DPC01DM49400HZ

DPC01DM49400HZ

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 45 mm POWER SUPPLY RANGE 440÷480 VAC MONITORING FUNCTION Under and over voltage, phase sequence/loss, asymmetry, tolerance MOUTING DIN-rail INPUT RANGE 440÷480 VAC OTHERS 50-400 Hz VLN monitoring

Three-phase control relay of max. and min. voltage, sequence, loss and phase asymmetry

3-Phase Star-Delta True RMS Monitoring Relay, Asymmetry, Tolerance, Sequence and Phase Loss, Over/Under Voltage, 2 SPDT Relay Outputs, IP20, DIN-rail mounting, Measuring Range 375 to 550Vac, 50-400Hz, 45x83.5x99.5mm housing

 		3 View Availability View Price

PPA01CM44

PPA01CM44

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, fixed MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 208÷415 VAC MONITORING FUNCTION Phase sequence, phase loss MOUTING Plug-in INPUT RANGE 208÷415 VAC OTHERS Regenerated voltage detection

Three-phase phase control relay and phase breakage, SPDT output, Power supply 208 to 415 VAC

3-phase loss and sequence monitoring relay, nominal range 208-415 V AC, SPDT relay output, regenerated voltage detection, 36 mm plug-in housing

 		3 View Availability View Price

DPA01DM48

DPA01DM48

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 1, fixed MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 380÷480 VAC MONITORING FUNCTION Phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 380÷480 VAC OTHERS Regenerated voltage detection

Control relay phase sequence and break phases, Output DPDT, Power supply 380 to 480 VAC

3-phase loss and sequence monitoring relay, nominal range 380-480 V AC, DPDT relay outputs, regenerated voltage detection, 22.5 mm DIN-rail housing

 		3 View Availability View Price

PPA03CM23

PPA03CM23

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Under voltage, phase sequence, phase loss MOUTING Plug-in INPUT RANGE 208÷240 VAC

Phase sequence and phase loss three-phase control relay plus min. voltage for Undecal base

3-phase monitoring relay for phase loss, sequence, undervoltage, nominal range 208-240 V AC, SPDT relay output, regenerated voltage detection, 36 mm plug-in housing

 		3 View Availability View Price

PPB02CM48

PPB02CM48

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others POWER SUPPLY RANGE 380÷415 VAC MONITORING FUNCTION Asymmetry, phase sequence/loss MOUTING Plug-in INPUT RANGE 380÷415 VAC DELAY 1, adjustable OTHERS VLN monitoring

Three-phase phase sequence, loss and asymmetry control relay, Undecal Base Mount

3-phase monitoring relay for phase loss, sequence, asymmetry, nominal range 380-480 V AC, delay on alarm 0.1-30 s, SPDT relay output, regenerated voltage detection, 36 mm plug-in housing

 		3 View Availability View Price

DPC01DM23

DPC01DM23

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 45 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Under and over voltage, phase sequence/loss, asymmetry, tolerance MOUTING DIN-rail INPUT RANGE 208÷240 VAC OTHERS VLN monitoring

Three-phase control relay of max. and min. voltage, sequence, loss and phase asymmetry

3-phase monitoring relay for phase loss, sequence, asymmetry, tolerance, over and undervoltage, nominal range 208-240 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing

 		3 View Availability View Price

DPB01CM48

DPB01CM48

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 380÷480 VAC MONITORING FUNCTION Under and over voltage, phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 380÷480 VAC DELAY 1, adjustable

Three-phase multifunction control relay, three-phase with neutral, TRMS, With phase sequence detection

3-phase monitoring relay for phase loss, sequence, over or undervoltage, nominal range 380-480 V AC, delay on alarm 0.1-30 s, SPDT relay output, regenerated voltage detection, 22.5 mm DIN-rail housing

 		3 View Availability View Price

PPA03CM48

PPA03CM48

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 380÷415 VAC MONITORING FUNCTION Under voltage, phase sequence, phase loss MOUTING Plug-in INPUT RANGE 380÷415 VAC

Phase sequence and phase loss three-phase control relay plus min. voltage for Undecal base

3-phase monitoring relay for phase loss, sequence, undervoltage, nominal range 380-480 V AC, SPDT relay output, regenerated voltage detection, 36 mm plug-in housing

 		3 View Availability View Price

DPC01DM23400HZ

DPC01DM23400HZ

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 45 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Under and over voltage, phase sequence/loss, asymmetry, tolerance MOUTING DIN-rail INPUT RANGE 208÷240 VAC OTHERS 50-400 Hz VLN monitoring

Three-phase control relay of max. and min. voltage, sequence, loss and phase asymmetry

3-phase monitoring relay for phase loss, sequence, asymmetry, tolerance, over and undervoltage, nominal range 208-240 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing

 		3 View Availability View Price

DPB01CM23

DPB01CM23

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Under and over voltage, phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 208÷240 VAC DELAY 1, adjustable

Three-phase control relay of max. and min. voltage, sequence and phase loss, Feed. 208 to 240 VAC

3-phase monitoring relay for phase loss, sequence, over or undervoltage, nominal range 208-240 V AC, delay on alarm 0.1-30 s, SPDT relay output, regenerated voltage detection, 22.5 mm DIN-rail housing

 		3 View Availability View Price

DPC01DM11400HZ

DPC01DM11400HZ

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 45 mm POWER SUPPLY RANGE 100÷115 VAC MONITORING FUNCTION Under and over voltage, phase sequence/loss, asymmetry, tolerance MOUTING DIN-rail INPUT RANGE 100÷115 VAC OTHERS 50-400 Hz VLN monitoring

Three-phase control relay of max. and min. voltage, sequence, loss and phase asymmetry

3-phase monitoring relay for phase loss, sequence, asymmetry, tolerance, over and undervoltage, nominal range 100-115 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing

 		3 View Availability View Price

DPA55CM44

DPA55CM44

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others POWER SUPPLY RANGE 208÷480 VDC MONITORING FUNCTION Under and over voltage, phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 208÷480 VAC

Three-phase control relay of max. and min. voltage, Power supply: 208 to 480 VAC, For DIN rail

3-phase window voltage monitoring relay, nominal range 208-480 V AC, SPDT relay output, self-powered, 17.5 mm DIN-rail housing

 		3 View Availability View Price

DPC01DM69

DPC01DM69

-

Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 45 mm POWER SUPPLY RANGE 600÷690 VAC MONITORING FUNCTION Under and over voltage, phase sequence/loss, asymmetry, tolerance MOUTING DIN-rail INPUT RANGE 600÷690 VAC OTHERS VLN monitoring

Three-phase control relay of max. and min. voltage, sequence, loss and phase asymmetry

3-phase monitoring relay for phase loss, sequence, asymmetry, tolerance, over and undervoltage, nominal range 600-690 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing

 		3 View Availability View Price

PPA02CM23

PPA02CM23

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, fixed MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Phase sequence MOUTING Plug-in INPUT RANGE 208÷240 VAC

Three-phase sequence control relay

3-phase sequence monitoring relay, nominal range 208-240 V AC, SPDT relay output, 36 mm plug-in housing

 		3 View Availability View Price

PPB01CM48N

PPB01CM48N

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 380÷415 VAC MONITORING FUNCTION Under and over voltage, phase sequence, phase loss MOUTING Plug-in INPUT RANGE 380÷415 VAC DELAY 1, adjustable OTHERS VLN monitoring

Three-phase, three-phase control relay with neutral, TRMS, Power supply 380 to 415 VAC

3-phase monitoring relay for phase loss, over or undervoltage, nominal range 380-480 V AC, delay on alarm 0.1-30 s, SPDT relay output, 36 mm plug-in housing

 		3 View Availability View Price

DPA51CM44

DPA51CM44

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, fixed MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 17,5 mm POWER SUPPLY RANGE 208÷480 VDC MONITORING FUNCTION Phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 208÷480 VAC OTHERS Regenerated voltage detection

Three-phase phase sequence and phase break control relay, SPDT output, Power supply 208 to 480 VAC

3-phase loss and sequence monitoring relay, nominal range 208-480 V AC, SPDT relay output, regenerated voltage detection, 17.5 mm DIN-rail housing

 		3 View Availability View Price

DPB01CM23N

DPB01CM23N

-

Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 3-phase AC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION Under and over voltage, phase sequence, phase loss MOUTING DIN-rail INPUT RANGE 208÷240 VAC DELAY 1, adjustable OTHERS VLN monitoring

Three-phase, three-phase control relay with neutral, TRMS, Power supply 208 to 240 VAC

3-phase monitoring relay for phase loss, over or undervoltage, nominal range 380-480 V AC, delay on alarm 0.1-30 s, SPDT relay output, regenerated voltage detection, 22.5 mm DIN-rail housing

 		3 View Availability View Price

Latest Customer Reviews

All ratings we receive from the items we offer are real and verified. A small gesture, but a lot of value. That's why we thank you for that minute you invest in leaving us your opinion and qualification about the products, because it helps us to continue improving and to offer you a service of even higher quality.

Newsletter
Follow us
My account