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Monitoring Relays and Measurement Current Transformers

Monitoring Relays and Measurement Current Transformers are essential components for supervising electrical parameters and scaling high currents for instrumentation. Monitoring relays, also known as supervisory relays or control relays, continuously measure variables such as voltage, current, frequency, phase sequence, and power factor, triggerin...

Monitoring Relays and Measurement Current Transformers are essential components for supervising electrical parameters and scaling high currents for instrumentation. Monitoring relays, also known as supervisory relays or control relays, continuously measure variables such as voltage, current, frequency, phase sequence, and power factor, triggering alarms or disconnections when thresholds are exceeded. Measurement current transformers (CTs), or instrument transformers, reduce primary currents to standardized secondary values (e.g., 1A or 5A) for metering and protection devices. These devices are available in various form factors, including socket-mounted, DIN-rail mounted, and panel-mounted versions, with rated insulation voltages up to 720V and accuracy classes from 0.5 to 1.0 for CTs. Monitoring relays often feature adjustable trip points, time delays, and multiple output contacts (SPDT, DPDT), while CTs come in solid-core, split-core, and wound-primary designs for different installation needs.

These components are deployed across industrial automation, power distribution, and building management systems. In motor control centers (MCCs), monitoring relays protect against phase loss, unbalance, and overload conditions. Measurement CTs are integral to energy management systems, substation automation, and switchgear assemblies, enabling accurate billing and load profiling. They are also used in renewable energy installations, such as solar inverters and wind turbine converters, for grid synchronization and power quality monitoring. Typical environments include electrical panels, control cabinets, and outdoor metering enclosures with IP20 to IP54 protection ratings.

Key subcategories include voltage monitoring relays (e.g., for single-phase or three-phase systems), current monitoring relays, frequency relays, and phase sequence relays. Measurement current transformers are categorized by primary current ratings (from 5A to 5000A) and secondary outputs (1A or 5A). Notable article codes often follow patterns like "RM-XXXX" for relays and "CT-XXXX" for transformers, with suffixes indicating amperage and accuracy class. For example, a three-phase voltage monitoring relay might be coded as "RM-3P-400V", while a split-core CT could be "CT-SC-200A-1A". These codes typically include the number of poles (e.g., 3P), rated voltage, and secondary current rating.

Partnering with Electric Automation Network ensures access to genuine, certified products with real-time pricing and up to 65% discount compared to market rates. Our engineering team provides personalized technical support for selecting the correct relay settings or CT ratio for your application. We offer express worldwide shipping from our global logistics hubs, with documentation including datasheets, wiring diagrams, and compliance certificates (CE, UL, IEC). Whether you need a single monitoring relay for a retrofit or bulk CTs for a new substation, we deliver reliability and expertise.

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Manufacturer Code Reference Catalog Number Description Delivery Price

DTA71CM24

DTA71CM24

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Output signal: 1 relay, Setpoints: 1, fixed , Monitored variable: Temperature monitoring, Size: 36 mm, Power supply range: 24÷240VAC and 24VDC , Monitoring function: Over temperature, Mouting: DIN-rail, Input range: PTC

Motor temperature control relay, 35mm DIN rail mounting, 1 SPDT relay output

Thermistor relay, measuring through up to 6 PTCs in series, 1 SPDT relay outputs, 35 mm DIN-rail housing

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DTA72DM24

DTA72DM24

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Output signal: 2 relays , Setpoints: 1, fixed , Monitored variable: Temperature monitoring, Size: 36 mm, Power supply range: 24÷240VAC and 24VDC , Monitoring function: Over temperature, Mouting: DIN-rail, Input range: PTC , Others: Reset function

Motor temperature control relay, 35mm DIN rail mount, 2 SPDT relay output

Thermistor relay, measuring through up to 6 PTCs in series, local and remote test and reset function, 2 SPDT relay outputs, 35 mm DIN-rail housing

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DPC02DM48

DPC02DM48

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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

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DPC02DM49

DPC02DM49

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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

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DWB01CM4810A

DWB01CM4810A

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE Power and power factor monitoring Others SIZE 45 mm POWER SUPPLY RANGE 380÷480 VAC MONITORING FUNCTION PF monitoring MOUTING DIN-rail INPUT RANGE 0.1-0.99 DELAY 1, adjustable

Three-phase load control relay in balanced three-phase system (TRMS), DIN Rail Mount

3-phase power factor monitoring relay, measuring range up to 5A, 10A or with MI current transformers, 1 SPDT relay output, 45 mm DIN-rail housing

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PIB02CD48150MV

PIB02CD48150MV

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC current monitoring Others SIZE 36 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over or under current MOUTING Plug-in INPUT RANGE 150 mV DELAY 1, adjustable

Single-phase control relay max. or min AC/DC intensity, TRMS, Power supply 24 to 48 VAC/DC

1-phase AC/DC over or undercurrent monitoring relay, input range 0.5-500 A AC, SPDT relay output, 36 mm plug-in housing

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DPA53CM48

DPA53CM48

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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

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DIB01CD485MA

DIB01CD485MA

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

Single-phase control relay max. intensity or min. of AC/DC, TRMS, Scale measured 0.1 to 5 mA AC/DC

1-phase AC/DC over or undercurrent monitoring relay, input range 0.1-5 mA AC/DC, SPDT relay output, 22.5 mm DIN-rail housing

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PWB03CM4810A

PWB03CM4810A

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE Power and power factor monitoring Others SIZE 36 mm POWER SUPPLY RANGE 380÷415 VAC MONITORING FUNCTION Active power monitoring MOUTING Plug-in INPUT RANGE 10 A, 690 VAC DELAY 1, adjustable

Three-phase control relay and active power steering, 36 mm undecal base mount.

3-phase active power direction monitoring relay, measuring range up to 5A, 10A or with MI current transformers, 1 SPDT relay output, 36 mm plug-in housing

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DIB01CB235MA

DIB01CB235MA

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

Single-phase control relay max. intensity or min. of AC/DC, TRMS, Scale measured 0.1 to 5 mA AC/DC

1-phase AC/DC over or undercurrent monitoring relay, input range 0.1-5 mA AC/DC, SPDT relay output, 22.5 mm DIN-rail housing

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PIB01CD485A

PIB01CD485A

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC current monitoring Others SIZE 36 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over or under current MOUTING Plug-in INPUT RANGE 5 A DELAY 1, adjustable

Single-phase control relay max. current or min. of AC/DC, TRMS, Scale measured 0.1 to 5 A AC/DC

1-phase AC/DC over or undercurrent monitoring relay, input range 0.1-5 A AC/DC, SPDT relay output, 36 mm plug-in housing

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DPC02DM23

DPC02DM23

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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

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DIC01DD48AV0

DIC01DD48AV0

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Selected parameters OUTPUT SIGNAL 2 relays SETPOINTS 2, adjustable MONITORED VARIABLE 1-phase AC/DC current monitoring Others SIZE 45 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over and under current MOUTING DIN-rail INPUT RANGE 20 mA DELAY 2, adjustable

Single-phase control relay max./min AC/DC, TRMS, Power supply 24 to 48 VAC/DC

1-phase AC/DC over or undercurrent monitoring relay, input range 0.5-5 mA AC/DC, 2 SPDT relay outputs, 45 mm DIN-rail housing

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PIB01CB2310A

PIB01CB2310A

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

Single-phase control relay max. intensity or min. of AC/DC, TRMS, Scale measured 1 to 10 A AC/DC

1-phase AC/DC over or undercurrent monitoring relay, input range 1-10 A AC/DC, SPDT relay output, 36 mm plug-in housing

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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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DLA71DB482P

DLA71DB482P

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Selected parameters OUTPUT SIGNAL 2 relays MONITORED VARIABLE Pump alternating Others SIZE 36 mm POWER SUPPLY RANGE 24/48 VAC MOUTING DIN-rail INPUT RANGE 2 pumps

Reciprocating control relay for 2 pumps, Power supply 24/48 VAC, Output 2 x 5A SPST

Pump alternating relay for 2 pumps, 2 SPST relay outputs, 35 mm DIN-rail housing

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DIB01CD4810A

DIB01CD4810A

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

Single-phase control relay max. intensity or min. of AC/DC, TRMS, Scale measured 1 to 10 A AC/DC

1-phase AC/DC over or undercurrent monitoring relay, input range 1-10 A AC/DC, SPDT relay output, 22.5 mm DIN-rail housing

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DWA01CM235A

DWA01CM235A

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE Power and power factor monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 208÷240 VAC MONITORING FUNCTION PF monitoring MOUTING DIN-rail INPUT RANGE 0.1-0.99

Three-phase Cos φ Control Relay, DIN Rail Mounting, Power supply 208 to 240 VAC

3-phase cos phi monitoring relay, measuring range up to 5 A or with MI current transformers, 1 SPDT relay output, 22.5 mm DIN-rail housing

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A82-3025

A82-3025

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Selected parameters PRIMARY CURRENT VALUE 25 A SECONDARY CURRENT / OUTPUT SIGNAL 0-10 VDC Others SYSTEM 1-phase MOUNTING Panel HOUSING Solid-core

Current transformer, closed core

AC current transducer, input range up to 25 A AC, 0-10 V DC analogue output, powered by loop voltage, wall mounting

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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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DIA53S72420A

DIA53S72420A

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Selected parameters OUTPUT SIGNAL NPN/PNP SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC current monitoring Others SIZE 17,5 mm MONITORING FUNCTION Over current MOUTING DIN-rail INPUT RANGE 20 A

Single-phase control relay, AC overcurrent, Measured scale 2 - 20 ACA, Standard reaction time

1-phase AC overcurrent monitoring relay, input range 2-20 A AC, NPN-PNP open collector output, self-powered, 17.5 mm DIN-rail housing

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DPA53CM23

DPA53CM23

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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

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DIB01CB2310A

DIB01CB2310A

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

Single-phase control relay max. intensity or min. of AC/DC, TRMS, Scale measured 1 to 10 A AC/DC

1-phase AC/DC over or undercurrent monitoring relay, input range 1-10 A AC/DC, SPDT relay output, 22.5 mm DIN-rail housing

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PIA01CD485A

PIA01CD485A

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC current monitoring Others SIZE 36 mm POWER SUPPLY RANGE 24÷48 VAC/DC MONITORING FUNCTION Over current MOUTING Plug-in INPUT RANGE 5 A

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

1-phase AC/DC overcurrent monitoring relay, input range 0.5-5 A AC/DC, SPDT relay output, 36 mm plug-in housing

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PTA01C115

PTA01C115

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, fixed MONITORED VARIABLE Temperature monitoring Others SIZE 45 mm POWER SUPPLY RANGE 115 VAC MONITORING FUNCTION Over temperature MOUTING Plug-in INPUT RANGE PTC

Motor temperature control relays without external reset, Power supply 115 VAC

Thermistor relay, measuring through PTC, 1 SPDT relay output, 36 mm plug-in housing

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DWB03CM4810A

DWB03CM4810A

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE Power and power factor monitoring Others SIZE 45 mm POWER SUPPLY RANGE 380÷480 VAC MONITORING FUNCTION Active power monitoring MOUTING DIN-rail INPUT RANGE 10 A, 690 VAC DELAY 1, adjustable

Three-phase control relay and active power steering, 45 mm DIN rail mounting.

3-phase active power direction monitoring relay, measuring range up to 5A, 10A or with MI current transformers, 1 SPDT relay output, 45 mm DIN-rail housing

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PWB02CM4810A

PWB02CM4810A

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 2, adjustable MONITORED VARIABLE Power and power factor monitoring Others SIZE 36 mm POWER SUPPLY RANGE 380÷415 VAC MONITORING FUNCTION Active power monitoring MOUTING Plug-in INPUT RANGE 10 A, 690 VAC DELAY 1, adjustable

Three-phase active power control relay, Undecal base mount, Power supply 380 to 415 VAC

3-phase active power monitoring relay, measuring range up to 5A, 10A or with MI current transformers, 1 SPDT relay output, 36 mm plug-in housing

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DPC01DM69400HZ

DPC01DM69400HZ

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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

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A82-30100

A82-30100

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Selected parameters PRIMARY CURRENT VALUE 100 A SECONDARY CURRENT / OUTPUT SIGNAL 0-10 VDC Others SYSTEM 1-phase MOUNTING Panel HOUSING Solid-core

Current transformer, closed core

AC current transducer, input range up to 100 A AC, 0-10 V DC analogue output, powered by loop voltage, wall mounting

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DIB01CB2350MA

DIB01CB2350MA

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Selected parameters OUTPUT SIGNAL 1 relay SETPOINTS 1, adjustable MONITORED VARIABLE 1-phase AC/DC current monitoring Others SIZE 22,5 mm POWER SUPPLY RANGE 115/230 VAC MONITORING FUNCTION Over or under current MOUTING DIN-rail INPUT RANGE 50 mA DELAY 1, adjustable

Single-phase control relay max. current or min. of AC/DC, TRMS, Scale measured 1 to 50 mA AC/DC

1-phase AC/DC over or undercurrent monitoring relay, input range 1-50 mA AC/DC, SPDT relay output, 22.5 mm DIN-rail housing

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