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Three Phase Voltage Transducer
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Three Phase Voltage Transducer

The 3AVT Three-Phase AC Voltage Transducer converts three-phase AC voltage into isolated 0–5Vdc signals compatible with ACR’s SRX3 and SRX7 data loggers. It provides a safe and reliable method of logging line voltage in industrial and energy management applications, allowing voltage trends to be recorded alongside current measurements for system analysis and troubleshooting.

Key Features

  • Self-Powered Operation - No external power supply required. The transducer derives its operating power directly from the measured AC line voltage
  • Three Isolated DC Outputs - Provides one isolated output per phase for independent L1, L2, and L3 monitoring
  • 0–5Vdc Output Compatible with SRX Loggers - Direct connection to any 0–5V DC input channel on ACR SRX3 or SRX7 loggers
  • RMS-Equivalent Measurement - Output is derived from the average absolute value of the AC input and calibrated to represent RMS voltage for sine wave systems
  • High Accuracy - ±0.25% full scale (10–100% of input range at 60Hz)
  • Rugged Industrial Construction - Metal enclosure designed for panel mounting in industrial environments
  • UL and CUL Listed - Suitable for use in regulated industrial installations
SKU: 35-0120
$999.00 USD

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Description Specifications Software Q&A

What It Does

The Model 3AVT is a three-phase AC voltage transducer that produces three isolated DC outputs proportional to the input phase voltages.

Each phase voltage is converted into a corresponding 0–5Vdc signal that can be connected directly to the ACR SRX3 AC Current Data Logger or to 0-5Vdc channels on the ACR SRX7 Process Signal Data Logger. The output is derived from the average absolute value of the AC input and calibrated to represent the RMS value of a sine wave.

When used with an SRX3, voltage measurements can be logged alongside current measurements from clamp-on CTs. This provides valuable insight into system behavior over time, including:

  • Sustained over- or under-voltage conditions

  • Long-duration voltage drift

  • Phase-to-phase imbalance

  • Correlation between load changes and steady-state voltage variation

Because the SRX3 samples at user-defined intervals (for example, 1–15 minutes or more), this solution is designed for trend logging and steady-state monitoring, not high-speed transient capture. It is not intended to replace a dedicated power quality analyzer.

The device is UL and CUL listed and features rugged metal construction suitable for industrial environments.  The device can be directly connected to ACR loggers without requiring external instrument power.

Specifications

Range 0 to 600V (three phase)
Size 4.4 x 3.8 x 4.7″ (112 x 97 x 119mm)

Software

The 3AVT voltage transducer does not require dedicated configuration software. It provides a 0–5Vdc analog output proportional to the selected AC voltage range.

When used with an ACR SRX3 AC Current Data Logger, scaling from 0–5Vdc to actual system voltage is handled within TrendReader TRX software.

Scaling in TrendReader TRX

In TrendReader TRX, a simple linear equation is applied to convert the logged 0–5V signal into engineering units (Volts AC).

For example, with a 0–600Vac model:

0Vdc = 0 Vac

5Vdc = 600 Vac

TRX applies the appropriate scaling factor so the displayed and exported data reflects actual AC voltage.

This ensures:

  • Accurate voltage readings in engineering units
  • Proper graph labeling
  • Meaningful trend analysis
  • Clean data export to Excel or other analysis tools

Important Note

The voltage transducer provides an RMS-equivalent output calibrated for sine wave systems. TrendReader TRX performs linear scaling only; it does not calculate true power, power factor, harmonics, or waveform distortion.

Q&A

Does the voltage transducer require an external power supply?

No. The transducer is self-powered and derives it's operating power directly from the measured AC line voltage. This simplifies installation because no separate control power connection is required.

Can this be connected directly to the SRX3 or SRX7?

Yes. The outputs from the transducer (0 to 5Vdc) connects directly to any 0–5V DC input channel on the SRX3 or SRX7. Each phase provides its own isolated 0–5V output, allowing independent monitoring of L1, L2, and L3.

What does the output represent — peak, average, or RMS?

The output is derived from the average absolute value of the AC waveform and calibrated to represent the RMS value of a sine wave. For standard 50/60Hz power systems with reasonably sinusoidal waveforms, the reading reflects RMS voltage.

Can this device capture short voltage sags or transient events?

No. When used with an SRX logger, voltage is recorded at the selected logging interval (for example, 1–15 minutes). This makes it suitable for sustained voltage monitoring and long-term trend analysis — not high-speed transient or power quality analysis.

If you require millisecond-level event capture, a dedicated power quality analyzer is recommended.

Can I use this to calculate real power (kW)?

Not directly. The transducer provides voltage trend data only. When combined with current measurements from CTs on the SRX3, you can observe correlations and estimate relative power trends. However, true power (kW), power factor, harmonics, and waveform distortion require specialized power analyzers.

Does the circuit need to be de-energized during installation?

Yes. Installation requires direct connection to the AC conductors and must be performed by a qualified electrician with power disconnected, in accordance with electrical codes.

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This provides valuable insight into system behavior over time, including:\u003c\/p\u003e\n\u003cul data-end=\"999\" data-start=\"819\"\u003e\n\u003cli data-end=\"866\" data-start=\"819\"\u003e\n\u003cp data-end=\"866\" data-start=\"821\"\u003eSustained over- or under-voltage conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"898\" data-start=\"867\"\u003e\n\u003cp data-end=\"898\" data-start=\"869\"\u003eLong-duration voltage drift\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"927\" data-start=\"899\"\u003e\n\u003cp data-end=\"927\" data-start=\"901\"\u003ePhase-to-phase imbalance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"999\" data-start=\"928\"\u003e\n\u003cp data-end=\"999\" data-start=\"930\"\u003eCorrelation between load changes and steady-state voltage variation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1257\" data-start=\"1001\"\u003eBecause the SRX3 samples at user-defined intervals (for example, 1–15 minutes or more), this solution is designed for\u003cstrong\u003e \u003c\/strong\u003etrend logging and steady-state monitoring, not high-speed transient capture. It is not intended to replace a dedicated power quality analyzer.\u003c\/p\u003e\n\u003cp data-end=\"1574\" data-start=\"1259\"\u003eThe device is UL and CUL listed and features rugged metal construction suitable for industrial environments.  The device can be directly connected to ACR loggers without requiring external instrument power.\u003c\/p\u003e","published_at":"2020-12-18T20:41:36-08:00","created_at":"2020-12-18T20:41:36-08:00","vendor":"ACR Systems","type":"Transducers Voltage","tags":["AC Current \u0026 Voltage"],"price":99900,"price_min":99900,"price_max":99900,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":37804119589035,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"35-0120","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Three Phase Voltage Transducer","public_title":null,"options":["Default Title"],"price":99900,"weight":0,"compare_at_price":null,"inventory_management":null,"barcode":"","requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}],"images":["\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3007_400_300.jpg?v=1610176395","\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3009_400_300.jpg?v=1610176414","\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3010_400_300.jpg?v=1610176441"],"featured_image":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3007_400_300.jpg?v=1610176395","options":["Title"],"media":[{"alt":null,"id":15548297543851,"position":1,"preview_image":{"aspect_ratio":0.93,"height":300,"width":279,"src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3007_400_300.jpg?v=1610176395"},"aspect_ratio":0.93,"height":300,"media_type":"image","src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3007_400_300.jpg?v=1610176395","width":279},{"alt":null,"id":15548298854571,"position":2,"preview_image":{"aspect_ratio":0.943,"height":300,"width":283,"src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3009_400_300.jpg?v=1610176414"},"aspect_ratio":0.943,"height":300,"media_type":"image","src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3009_400_300.jpg?v=1610176414","width":283},{"alt":null,"id":15548300558507,"position":3,"preview_image":{"aspect_ratio":1.193,"height":300,"width":358,"src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3010_400_300.jpg?v=1610176441"},"aspect_ratio":1.193,"height":300,"media_type":"image","src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3010_400_300.jpg?v=1610176441","width":358}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3 data-start=\"911\" data-end=\"927\"\u003eWhat It Does\u003c\/h3\u003e\n\u003cp data-start=\"929\" data-end=\"1104\"\u003eThe Model 3AVT is a three-phase AC voltage transducer that produces three isolated DC outputs proportional to the input phase voltages.\u003c\/p\u003e\n\u003cp data-start=\"1106\" data-end=\"1272\"\u003eEach phase voltage is converted into a corresponding 0–5Vdc signal that can be connected directly to the \u003ca href=\"https:\/\/www.acrdatasolutions.com\/products\/srx3-three-phase-ac-current-logger\"\u003eACR SRX3 AC Current Data Logger\u003c\/a\u003e or to 0-5Vdc channels on the \u003ca href=\"https:\/\/www.acrdatasolutions.com\/products\/srx7\"\u003eACR SRX7 Process Signal Data Logger\u003c\/a\u003e. \u003cstrong data-start=\"1276\" data-end=\"1307\"\u003e\u003c\/strong\u003eThe output is derived from the average absolute value of the AC input and calibrated to represent the RMS value of a sine wave.\u003c\/p\u003e\n\u003cp data-end=\"817\" data-start=\"635\"\u003eWhen used with an SRX3, voltage measurements can be logged alongside current measurements from clamp-on CTs. This provides valuable insight into system behavior over time, including:\u003c\/p\u003e\n\u003cul data-end=\"999\" data-start=\"819\"\u003e\n\u003cli data-end=\"866\" data-start=\"819\"\u003e\n\u003cp data-end=\"866\" data-start=\"821\"\u003eSustained over- or under-voltage conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"898\" data-start=\"867\"\u003e\n\u003cp data-end=\"898\" data-start=\"869\"\u003eLong-duration voltage drift\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"927\" data-start=\"899\"\u003e\n\u003cp data-end=\"927\" data-start=\"901\"\u003ePhase-to-phase imbalance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"999\" data-start=\"928\"\u003e\n\u003cp data-end=\"999\" data-start=\"930\"\u003eCorrelation between load changes and steady-state voltage variation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1257\" data-start=\"1001\"\u003eBecause the SRX3 samples at user-defined intervals (for example, 1–15 minutes or more), this solution is designed for\u003cstrong\u003e \u003c\/strong\u003etrend logging and steady-state monitoring, not high-speed transient capture. It is not intended to replace a dedicated power quality analyzer.\u003c\/p\u003e\n\u003cp data-end=\"1574\" data-start=\"1259\"\u003eThe device is UL and CUL listed and features rugged metal construction suitable for industrial environments.  The device can be directly connected to ACR loggers without requiring external instrument power.\u003c\/p\u003e"}
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This provides valuable insight into system behavior over time, including:\u003c\/p\u003e\n\u003cul data-end=\"999\" data-start=\"819\"\u003e\n\u003cli data-end=\"866\" data-start=\"819\"\u003e\n\u003cp data-end=\"866\" data-start=\"821\"\u003eSustained over- or under-voltage conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"898\" data-start=\"867\"\u003e\n\u003cp data-end=\"898\" data-start=\"869\"\u003eLong-duration voltage drift\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"927\" data-start=\"899\"\u003e\n\u003cp data-end=\"927\" data-start=\"901\"\u003ePhase-to-phase imbalance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"999\" data-start=\"928\"\u003e\n\u003cp data-end=\"999\" data-start=\"930\"\u003eCorrelation between load changes and steady-state voltage variation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1257\" data-start=\"1001\"\u003eBecause the SRX3 samples at user-defined intervals (for example, 1–15 minutes or more), this solution is designed for\u003cstrong\u003e \u003c\/strong\u003etrend logging and steady-state monitoring, not high-speed transient capture. It is not intended to replace a dedicated power quality analyzer.\u003c\/p\u003e\n\u003cp data-end=\"1574\" data-start=\"1259\"\u003eThe device is UL and CUL listed and features rugged metal construction suitable for industrial environments.  The device can be directly connected to ACR loggers without requiring external instrument power.\u003c\/p\u003e","published_at":"2020-12-18T20:41:36-08:00","created_at":"2020-12-18T20:41:36-08:00","vendor":"ACR Systems","type":"Transducers Voltage","tags":["AC Current \u0026 Voltage"],"price":99900,"price_min":99900,"price_max":99900,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":37804119589035,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"35-0120","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Three Phase Voltage Transducer","public_title":null,"options":["Default Title"],"price":99900,"weight":0,"compare_at_price":null,"inventory_management":null,"barcode":"","requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}],"images":["\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3007_400_300.jpg?v=1610176395","\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3009_400_300.jpg?v=1610176414","\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3010_400_300.jpg?v=1610176441"],"featured_image":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3007_400_300.jpg?v=1610176395","options":["Title"],"media":[{"alt":null,"id":15548297543851,"position":1,"preview_image":{"aspect_ratio":0.93,"height":300,"width":279,"src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3007_400_300.jpg?v=1610176395"},"aspect_ratio":0.93,"height":300,"media_type":"image","src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3007_400_300.jpg?v=1610176395","width":279},{"alt":null,"id":15548298854571,"position":2,"preview_image":{"aspect_ratio":0.943,"height":300,"width":283,"src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3009_400_300.jpg?v=1610176414"},"aspect_ratio":0.943,"height":300,"media_type":"image","src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3009_400_300.jpg?v=1610176414","width":283},{"alt":null,"id":15548300558507,"position":3,"preview_image":{"aspect_ratio":1.193,"height":300,"width":358,"src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3010_400_300.jpg?v=1610176441"},"aspect_ratio":1.193,"height":300,"media_type":"image","src":"\/\/www.acrdatasolutions.com\/cdn\/shop\/products\/3010_400_300.jpg?v=1610176441","width":358}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3 data-start=\"911\" data-end=\"927\"\u003eWhat It Does\u003c\/h3\u003e\n\u003cp data-start=\"929\" data-end=\"1104\"\u003eThe Model 3AVT is a three-phase AC voltage transducer that produces three isolated DC outputs proportional to the input phase voltages.\u003c\/p\u003e\n\u003cp data-start=\"1106\" data-end=\"1272\"\u003eEach phase voltage is converted into a corresponding 0–5Vdc signal that can be connected directly to the \u003ca href=\"https:\/\/www.acrdatasolutions.com\/products\/srx3-three-phase-ac-current-logger\"\u003eACR SRX3 AC Current Data Logger\u003c\/a\u003e or to 0-5Vdc channels on the \u003ca href=\"https:\/\/www.acrdatasolutions.com\/products\/srx7\"\u003eACR SRX7 Process Signal Data Logger\u003c\/a\u003e. \u003cstrong data-start=\"1276\" data-end=\"1307\"\u003e\u003c\/strong\u003eThe output is derived from the average absolute value of the AC input and calibrated to represent the RMS value of a sine wave.\u003c\/p\u003e\n\u003cp data-end=\"817\" data-start=\"635\"\u003eWhen used with an SRX3, voltage measurements can be logged alongside current measurements from clamp-on CTs. This provides valuable insight into system behavior over time, including:\u003c\/p\u003e\n\u003cul data-end=\"999\" data-start=\"819\"\u003e\n\u003cli data-end=\"866\" data-start=\"819\"\u003e\n\u003cp data-end=\"866\" data-start=\"821\"\u003eSustained over- or under-voltage conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"898\" data-start=\"867\"\u003e\n\u003cp data-end=\"898\" data-start=\"869\"\u003eLong-duration voltage drift\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"927\" data-start=\"899\"\u003e\n\u003cp data-end=\"927\" data-start=\"901\"\u003ePhase-to-phase imbalance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"999\" data-start=\"928\"\u003e\n\u003cp data-end=\"999\" data-start=\"930\"\u003eCorrelation between load changes and steady-state voltage variation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1257\" data-start=\"1001\"\u003eBecause the SRX3 samples at user-defined intervals (for example, 1–15 minutes or more), this solution is designed for\u003cstrong\u003e \u003c\/strong\u003etrend logging and steady-state monitoring, not high-speed transient capture. It is not intended to replace a dedicated power quality analyzer.\u003c\/p\u003e\n\u003cp data-end=\"1574\" data-start=\"1259\"\u003eThe device is UL and CUL listed and features rugged metal construction suitable for industrial environments.  The device can be directly connected to ACR loggers without requiring external instrument power.\u003c\/p\u003e"}