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Voltage monitoring relay

Voltage monitoring relays are essential protection devices designed to continuously supervise electrical supply parameters in industrial and commercial installations. These relays detect undervoltage, overvoltage, phase loss, phase sequence errors, and voltage asymmetry in three-phase and single-phase systems. Typically available in DIN rail mou...

Voltage monitoring relays are essential protection devices designed to continuously supervise electrical supply parameters in industrial and commercial installations. These relays detect undervoltage, overvoltage, phase loss, phase sequence errors, and voltage asymmetry in three-phase and single-phase systems. Typically available in DIN rail mounting formats, they feature adjustable thresholds, time delays, and output contacts (SPDT or DPDT) rated for control circuits up to 250V AC. They operate across a wide voltage range, from 24V DC to 690V AC, with frequency ratings of 50/60 Hz. Many models include LED indicators for status and alarm conditions, ensuring real-time visibility of power quality.

These relays are deployed in motor control centers (MCCs), distribution panels, HVAC systems, pump stations, and critical process automation where voltage stability is paramount. They protect sensitive equipment like PLCs, variable frequency drives (VFDs), and contactors from damage caused by grid disturbances. Common sectors include manufacturing, water treatment, data centers, renewable energy (solar and wind), and building management systems. They are also used in generator synchronization and UPS systems to prevent load shedding or equipment failure.

Key subcategories include three-phase voltage monitoring relays (e.g., models with adjustable over/under voltage settings like the RM4TU series), single-phase voltage monitors, and phase sequence relays. Articles often follow coding patterns such as "RM4-TU02" or "CM-PVS.31S", where the prefix indicates the series and suffix denotes voltage range or output configuration. Other relevant codes include "EMT6-U" for universal voltage monitors and "DPA51CM44" for phase asymmetry detection. These devices are typically ordered with specific voltage ranges (e.g., 208-480V AC) and time delay options.

At Electric Automation Network, we provide express worldwide shipping and personalized technical support from specialized engineers. Our team assists with relay selection, threshold calibration, and integration into existing control systems. Each product includes detailed technical documentation, real-time pricing, and compatibility checks for accessories like sockets or terminal blocks. We ensure fast delivery to minimize downtime in your operations.

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Manufacturer Code Reference Catalog Number Description Delivery Price

5TT3414

5TT3414

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Voltage relays AC 230/400V 0.85 1 CO contact Response delay 0.5 s Return transfer delay 60 s

1, 2 OR 3-PHASE MONITORING RELAY WITH RESPECT TO N. THRESHOLD 0.85 NOT ADJUSTABLE, FIXED RESPONSE TIME 0.5S, FIXED RESET TIME AT 60S 1 SWITCHED. Cancelations and returns limited. Consult conditions.

 		3 View Availability View Price

5TT3403

5TT3403

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Voltage relay T5570 AC 230/400V 2W 0.85/0.95 With transparent cap

Minimum voltage relay >N<, for monitoring 1, 2 or 3 phases with respect to N, 2 modules, Udesc.=0.85xUc, Ucon.=0.95xUc, 230/400 V, 4 A, 2 switches. Cancelations and returns limited. Consult conditions.

 		3 View Availability View Price

5TT3404

5TT3404

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Voltage relay T5570 AC 230/400V 2W 0.7/0.9 Asymmetry with transparent cap

Minimum voltage relay >N<, for monitoring 1, 2 or 3 phases with respect to N, 1 module, 4 A, Udesc.=0.7xUc, Ucon.=0.9xUc, with recognition of asymmetry and monitoring of neutral, 230/400 V, 4 A, 1 switch. Cancelations and returns limited. Consult conditions.

 		3 View Availability View Price

5TT3402

5TT3402

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Voltage relay T5570 AC 230/400V 2W 0.7/0.9 With transparent cap

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5TT3195

5TT3195

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Voltage relays AC 230/400V 2W 0.9/1.3 Asymmetrical monitoring With transparent cap

Maximum voltage relay >N<, for asymmetric monitoring of 3 phases with respect to N, 2 modules, 230/400 V, 4 A, Udesc.=0.9 to 1.3xUc. Cancelations and returns limited. Consult conditions.

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5TT3461

5TT3461

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Fault signaling relay T5570 230 V AC 5 A Additional detector with transparent cap

RELAY WARNS OF BREAKDOWN >N< AC 230V ADDITIONAL. Manufactured to order. Non-Cancelable Non-Returnable.

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5TT3460

5TT3460

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Fault signaling relay T5570 230 V AC 5 A with reset with transparent cap

RELAY WARNS OF FAULT >N< AC 230V 5A WITH RESET. Cancelations and returns limited. Consult conditions.

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5TT3415

5TT3415

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Voltage relays AC 230/400V 0.85 2 CO contacts Response delay 0.5 s Return transfer delay 60 s Test key

1, 2 OR 3-PHASE MONITORING RELAY WITH RESPECT TO N. THRESHOLD 0.85 NOT ADJUSTABLE, FIXED RESPONSE TIME 0.5S, FIXED RESET TIME AT 60S 2 SWITCHED. Cancelations and returns limited. Consult conditions.

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1SVR740831R0300

1SVR740831R0300

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CM-ESS.1P Voltage monitoring relay 1c/o, B-C=3-600VRMS, 110-130VAC

CM-ESS.1P RELe CTL TENSIoN MONOF 1 C/C R

CM-ESS.1P Voltage monitoring relay 1c/o, B-C=3-600VRMS, 110-130VAC

 		3 View Availability View Price

1SVR740831R1300

1SVR740831R1300

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CM-ESS.1P Voltage monitoring relay 1c/o, B-C=3-600VRMS, 220-240VAC

CM-ESS.1P RELe CTL TENSIoN MONOF 1 C/C R

CM-ESS.1P Voltage monitoring relay 1c/o, B-C=3-600VRMS, 220-240VAC

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DUB71CB23500V

DUB71CB23500V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 115/230 VAC MONITORING FUNCTION Over or under voltage MOUTING DIN-rail INPUT RANGE 500 V DELAY 1, adjustable

Single-phase control relay of max./min voltage AC/DC (TRMS), Measurement scale 2 to 500 V AC/DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 2-500 V AC/DC, SPDT relay output, 35.5 mm DIN-rail housing

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DUB71CB48500V

DUB71CB48500V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 24/48 VAC MONITORING FUNCTION Over or under voltage MOUTING DIN-rail INPUT RANGE 500 V DELAY 1, adjustable

Single-phase control relay of max./min voltage AC/DC (TRMS), Measurement scale 2 to 500 V AC/DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 2-500 V AC/DC, SPDT relay output, 35.5 mm DIN-rail housing

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DUB71CB4810V

DUB71CB4810V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 24/48 VAC MONITORING FUNCTION Over or under voltage MOUTING DIN-rail INPUT RANGE 10 V DELAY 1, adjustable

Single-phase control relay of max./min voltage AC/DC (TRMS), Measurement scale 0.1 to 10 V AC/DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 0.1-10 V AC/DC, SPDT relay output, 35.5 mm DIN-rail housing

 		3 View Availability View Price

DUA52C724

DUA52C724

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 17,5 mm POWER SUPPLY RANGE 8÷28 VDC MONITORING FUNCTION Under voltage for DC battery MOUTING DIN-rail INPUT RANGE 8÷28 VDC

Relay, control voltage min. DC Power 12/24 VDC, measuring range 8 to 28 VDC

1-phase DC undervoltage monitoring relay, nominal range 8-28 V DC, SPDT relay output, self-powered, 17.5 mm DIN-rail housing

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PUB03CW24

PUB03CW24

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 12÷240 VAC/DC MONITORING FUNCTION Over or under voltage MOUTING Plug-in INPUT RANGE 12÷240 VAC/DC DELAY 1, adjustable

Single-phase control relay of max. or min voltage AC/DC (TRMS), Undecal base

1-phase AC/DC over or undervoltage monitoring relay, nominal range 24/48/115/240 V AC/DC, SPDT relay output, 36 mm plug-in housing

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DUA52C748

DUA52C748

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SIZE 17,5 mm POWER SUPPLY RANGE 38÷58 VDC MONITORING FUNCTION Under voltage for DC battery MOUTING DIN-rail INPUT RANGE 38÷58 VDC

Relay, control voltage min. DC Power 48 VDC, measurement Scale 38 to 58 VDC

1-phase DC undervoltage monitoring relay, nominal range 38-58 V DC, SPDT relay output, self-powered, 17.5 mm DIN-rail housing

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PUC01CB23500V

PUC01CB23500V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 115/230 VAC MONITORING FUNCTION Over and under voltage MOUTING Plug-in INPUT RANGE 500 V DELAY 2, adjustable

Single-phase control relay of max. voltage and min. AC / DC, TRMS, Measurement scale from 2 to 500 VAC / DC

1-phase AC/DC over and undervoltage monitoring relay, nominal range 2-500 V AC/DC, SPDT relay output, 36 mm plug-in housing

 		3 View Availability View Price

PUB01CD4810V

PUB01CD4810V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over and under voltage MOUTING Plug-in INPUT RANGE 10 V DELAY 1, adjustable

Single-phase control relay of max. or min voltage AC/DC (TRMS), Scale measured 0.1 to 10 VAC/DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 0.1-10 V AC/DC, SPDT relay output, 36 mm plug-in housing

 		3 View Availability View Price

PUB01CB23500V

PUB01CB23500V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 115/230 VAC MONITORING FUNCTION Over and under voltage MOUTING Plug-in INPUT RANGE 500 V DELAY 1, adjustable

Single-phase control relay of max. or min voltage AC / DC (TRMS), Measured scale 2 to 500 VAC / DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 2-500 V AC/DC, SPDT relay output, 36 mm plug-in housing

 		3 View Availability View Price

PUC01CD48500V

PUC01CD48500V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over and under voltage MOUTING Plug-in INPUT RANGE 500 V DELAY 2, adjustable

Single-phase control relay of max. voltage and min. AC / DC, TRMS, Measurement scale from 2 to 500 VAC / DC

1-phase AC/DC over and undervoltage monitoring relay, nominal range 2-500 V AC/DC, SPDT relay output, 36 mm plug-in housing

 		3 View Availability View Price

DUA55CM44

DUA55CM44

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS window selectable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 17,5 mm POWER SUPPLY RANGE 208÷480 VDC MONITORING FUNCTION Over and under voltage MOUTING DIN-rail INPUT RANGE 208/220/230/240 VAC

Single-phase relay for detection of incorrect mains voltage, Power supply 208 to 480 VAC

1-phase AC 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

DUB01CD48500V

DUB01CD48500V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over and under voltage MOUTING DIN-rail INPUT RANGE 500 V DELAY 1, adjustable

Single-phase control relay of max. or min voltage AC / DC (TRMS), Measured scale 2 to 500 VAC / DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 2-500 V AC/DC, SPDT relay output, 22.5 mm DIN-rail housing

 		3 View Availability View Price

DUB01CD4810V

DUB01CD4810V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over and under voltage MOUTING DIN-rail INPUT RANGE 10 V DELAY 1, adjustable

Single-phase control relay of max. or min voltage AC/DC (TRMS), Scale measured 0.1 to 10 VAC/DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 0.1-10 V AC/DC, SPDT relay output, 22.5 mm DIN-rail housing

 		3 View Availability View Price

PUB01CB2310V

PUB01CB2310V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 115/230 VAC MONITORING FUNCTION Over or under voltage MOUTING Plug-in INPUT RANGE 10 V DELAY 1, adjustable

Single-phase control relay of max. or min voltage AC/DC (TRMS), Scale measured 0.1 to 10 VAC/DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 0.1-10 V AC/DC, SPDT relay output, 36 mm plug-in housing

 		3 View Availability View Price

DUB01CB23500V

DUB01CB23500V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 115/230 VAC MONITORING FUNCTION Over and under voltage MOUTING DIN-rail INPUT RANGE 500 V DELAY 1, adjustable

Single-phase control relay of max. or min voltage AC / DC (TRMS), Measured scale 2 to 500 VAC / DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 2-500 V AC/DC, SPDT relay output, 22.5 mm DIN-rail housing

 		3 View Availability View Price

PUB01CD48500V

PUB01CD48500V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 36 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over and under voltage MOUTING Plug-in INPUT RANGE 500 V DELAY 1, adjustable

Single-phase control relay of max. or min voltage AC / DC (TRMS), Measured scale 2 to 500 VAC / DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 2-500 V AC/DC, SPDT relay output, 36 mm plug-in housing

 		3 View Availability View Price

DUA01CD48500V

DUA01CD48500V

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over voltage MOUTING DIN-rail INPUT RANGE 500 VAC 4 Vp

Single-phase control relay AC/DC overvoltage - AC overcurrent, Power supply 24 to 48 VAC/DC

1-phase AC/DC overvoltage or AC overcurrent monitoring relay, nominal range 2-500 V AC/DC or 0.4-4 Vp AC (for MI or MP), SPDT relay output, 22.5 mm DIN-rail housing

 		3 View Availability View Price

DUB01CB2310V

DUB01CB2310V

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OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC voltage monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 115/230 VAC MONITORING FUNCTION Over or under voltage MOUTING DIN-rail INPUT RANGE 10 V DELAY 1, adjustable

Single-phase control relay of max. or min voltage AC/DC (TRMS), Scale measured 0.1 to 10 VAC/DC

1-phase AC/DC over or undervoltage monitoring relay, nominal range 0.1-10 V AC/DC, SPDT relay output, 22.5 mm DIN-rail housing

 		3 View Availability View Price

1SVR730831R0300

1SVR730831R0300

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CM-ESS.1S Voltage monitoring relay 1c/o, B-C=3-600VRMS, 110-130VAC

CM-ESS.1S RELe CTL TENSIoN MONOF 1 C/C T

CM-ESS.1S.B 600V, AL. 110-130 VAC-SCREW

 		3 View Availability View Price

1SVR730831R1300

1SVR730831R1300

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CM-ESS.1S Voltage monitoring relay 1c/o, B-C=3-600VRMS, 220-240VAC

CM-ESS.1S RELe CTL TENSIoN MONOF 1 C/C T

CM-ESS.1S Voltage monitoring relay 1c/o, B-C=3-600VRMS, 220-240VAC

 		2 View Availability View Price

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