Overview

The Electrocorder EC-3A-RS is a portable three-phase current logger for high-current load surveys, feeder monitoring, energy audits and industrial current investigations.

Use it when you need to record three-phase current over time, especially on larger industrial or commercial loads where a conventional clamp logger may not have enough current range. The EC-3A-RS uses three flexible Rogowski coils that fit around conductors up to 140 mm diameter and records TRMS average, minimum and maximum current values throughout the selected averaging period.

Best for:

• Three-phase load surveys on high-current circuits.
• Feeder loading checks and current-consumption investigations.
• Energy audits where current trends are enough to identify major load patterns.
• Sites where flexible Rogowski coils are easier to fit than clamp current transformers.
• Temporary monitoring where voltage connection is not required.

Consider another model if:

• You need voltage, current, power, energy and power factor together, where the EC-7VAR-RS is a better fit.
• You only need lower current ranges on smaller conductors, where the CT-3A-RS may be simpler.
• You need voltage-only monitoring, where an EC-3V or SL-3V voltage recorder may be more appropriate.

What you get:

• EC-3A-RS logger in the smaller 190 x 120 x 60 mm enclosure.
• Three flexible Rogowski current sensors for conductors up to 140 mm diameter.
• USB download lead, carry case, 12 Vdc power supply, batteries, user instructions and free Electrosoft analysis software.

Set up the logger in Electrosoft, install it at the measurement point, then start recording. When enough data has been captured, connect the logger to a PC by USB and use Electrosoft to view, save, export and report on the results.

Applications

Typical applications: The EC-3A-RS is intended for current-only studies where larger current ranges or flexible sensors are needed. Because it does not require a voltage connection, it is often quicker to install than a full power logger.

What the EC-3A-RS records:

• Three-phase current using flexible Rogowski coils.
• Dual current ranges: 4 A to 400 A and 30 A to 3 kA.
• TRMS average, minimum and maximum values across the selected averaging period.
• Long-term trend data for load surveys, energy audits and fault investigations.

Why constant sampling matters: many instruments only take periodic snapshots. The Electrocorder continuously samples throughout the averaging period, helping capture short events, changing loads and trend data that can otherwise be missed.

Recording duration depends on the selected averaging period. Short averaging periods can be used for detailed studies, while longer periods support extended monitoring and energy-audit work.

The logger is built into a rugged 190 x 120 x 60 mm enclosure and is supplied with a protective carry case, flexible Rogowski coils, USB lead and external 12 Vdc power supply. External power is recommended when available to preserve the internal batteries.

Related application guides:

• Load Survey and Current Loggers: for feeder checks, current logging, load surveys and capacity planning.
• Energy Audit Loggers: for energy audits, load profiles, peak demand and before/after savings evidence.

Case Studies

These related Electrocorder case studies, application pages and articles show how this type of logging is used in practical investigations.

Saving Energy in Industry
An industrial energy-saving application page focused on measurement, ongoing data logging and identifying where energy reductions may be possible. Current loggers such as the EC-3A-RS are relevant where current trends help identify major load patterns.

Energy Auditing
A knowledge page explaining how recorded electrical data supports energy audits, load profiling and decisions about where energy reductions may be possible.

Performing an Energy Audit
A blog article covering practical energy-audit steps and the value of recording electrical usage rather than relying on assumptions.

Recording Electrical Energy Use is Easy
An article explaining how Electrocorder loggers and Electrosoft help capture, review and report recorded electrical data.

Resources

Documentation:
Download the EC-3A-RS datasheet and user instructions for detailed technical information, installation guidance and operating instructions.

	Datasheet
	User Instructions (English)

Free Electrosoft PC software
Electrosoft is compatible with Windows 11 down to Windows 7. It lets you view and zoom current, power and energy graphs, export data to Microsoft Excel, email results to colleagues, and print or save reports as PDF files with your company logo.

Electrosoft includes statistics, load balancing, tariff and costing analysis, annual CO2 and energy usage projections, logger management and calibration management tools. Sample files are included so you can try the software without having a logger connected.

Download Electrosoft PC software

Features

When to choose the EC-3A-RS
Choose this model when the main question is how much current a three-phase circuit carries over time, especially where high current range and flexible fitting matter more than voltage or power-factor measurement.

Compare with related Electrocorder models
If you need voltage, current, power and power factor together, consider the EC-7VAR-RS. If the conductors are smaller and lower current ranges are enough, consider the CT-3A-RS. If the investigation is about voltage quality or supply variation, consider the EC-3V or SL-3V.

Key features:

• Three flexible Rogowski coils for practical fitting around large conductors.
• Dual current ranges for both moderate and high-current circuits.
• Current-only installation without a voltage connection.
• Configurable averaging period for short investigations or longer-term monitoring.
• Constant sampling to reduce the risk of missing short-duration or changing load events.
• Tamper-resistant setup: once configured on a PC, site personnel cannot alter logging parameters from the logger.

Measurement note
Because the EC-3A-RS is a current-only logger, it is useful for load surveys and current trend analysis, but it does not calculate kW, kVA, kVAR or power factor by itself. Use a power logger such as the EC-7VAR-RS when those values are needed.

Included with your portable three-phase current logger with dual 4 A to 400 A and 30 A to 3 kA ranges:

• EC-3A-RS logger in the smaller 190 x 120 x 60 mm enclosure.
• Three flexible Rogowski current sensors for conductors up to 140 mm diameter.
• USB download lead, carry case, 12 Vdc power supply, batteries, user instructions and free Electrosoft analysis software.

Shipping and origin details:

• Harmonised Code: 9030.3901.00 (electronic datalogger).
• Origin: Northern Ireland, United Kingdom.
• Packaged dimensions: approximately 2.5 kg, 30 x 25 x 17 cm.

Determining product order codes:

To specify your Electrocorder select various codes and enter into the boxes in order to create an accurate product code. For example: EC-3A-RS-5H-IP65-SET.

FAQ

When should I choose the EC-3A-RS?
Choose it for three-phase current-only monitoring where larger current ranges or flexible Rogowski coils are needed.

Does it measure voltage or power factor?
No. The EC-3A-RS is a current logger. For voltage, current, power, energy and power factor together, consider the EC-7VAR-RS.

Why use Rogowski coils?
Rogowski coils are flexible and can be easier to fit around large conductors or awkward busbar/cable arrangements than rigid clamp sensors.

Can it be installed without interrupting the supply?
In many cases, yes, because the current sensors fit around the conductors and no voltage connection is required. It should still be installed by a competent person.

What software is used to analyse the data?
Electrosoft PC software is used to configure the logger, download recorded data, view graphs, export data and create analysis reports.