01
Measurements by phase
View voltage, current and active power separately for L1, L2 and L3, plus total electrical values.
GEYER SMART · ER3100CT · 3 CURRENT TRANSFORMERS
Three-phase energy consumption.Measurement without interrupting the circuit.
Smart three-phase Wi-Fi energy meter with three external split-core current transformers for real-time, historical and bidirectional monitoring of consumption and electrical values up to 100 A per phase.
100 Aper phase
Wi-Fi2.4 GHz
1 moduleon DIN rail
Bidirectional meteringForward & reverse energy
3 current transformersMeasurements by phase
CONNECTED ECOSYSTEM
Amazon Alexa
Google Home
Tuya Smart
Smart Life3 PHASES · BIDIRECTIONAL ENERGY · HISTORY
A complete picture of three-phase consumption.
ER3100CT measures all three phases through three external current transformers and sends live values, bidirectional energy and history to GEYER Smart.
02
Three current transformers
Each phase conductor passes through its corresponding split-core transformer, without routing the load through the meter.
03
Bidirectional energy & history
Monitor total, forward and reverse active energy and review statistics by day, month or year.
04
Remote access & sharing
Check measurements wherever you are, receive push notifications and share the device with up to 20 users.
THREE-PHASE · 100 A PER PHASE · 3 CURRENT TRANSFORMERS
Three-phase energy data from the electrical panel, available on your phone.
GEYER SMART APP
All three phases and energy history on your phone.
View voltage, current and active power per phase, total active and reactive power, power factor, forward and reverse energy, and statistics by day, month or year.
APPLICATIONS
Consumption monitoring for everyday three-phase installations.
01
THREE-PHASE HOME
Monitor the total consumption and phase balance of a three-phase residential supply.
02
BUSINESS
Track energy use and identify periods of increased demand in a shop, office or workshop.
03
HOLIDAY HOME / AIRBNB
Check consumption remotely and retain a historical view while you are away.
04
PHASE & LOAD ANALYSIS
Compare the three phases, power factor and bidirectional energy to better understand the installation.
The suitability of the installation, protection and conductor cross-section must be assessed by a qualified electrician, who must install and wire the product with the power supply isolated.
TECHNICAL SPECIFICATIONS
Three-phase bidirectional metering with three current transformers.
Compact Wi-Fi energy meter for a 35 mm DIN rail, one module wide, with measurements per phase and remote data access.
CEREDRoHS2-year warranty
Input voltage100–240 VAC per phase (L–N)
Frequency50–60 Hz
Maximum measured current100 A per phase
SystemThree-phase
Current sensing3 external split-core current transformers
Energy directionBidirectional · forward and reverse active energy
Wi-Fi2.4 GHz
Mounting35 mm DIN rail, 1 module
Dimensions65.5 × 18 × 90 mm
Operating temperature−10 °C to +60 °C
MeasurementsVoltage, current and active power per phase · total active/reactive power · overall power factor · total/forward/reverse active energy
StatisticsDay · month · year
Shared usersUp to 20
NotificationsPush notifications
Warranty2 years
ComplianceCE · RED 2014/53/EU · LVD · EMC · RoHS
INSTALLATION & PAIRING
Three essential steps.
01
Installation
Mount ER3100CT on a 35 mm DIN rail. With the power supply isolated, a qualified electrician connects N, L1, L2 and L3. Open each split-core current transformer, position it around the corresponding live conductor, close it securely and observe the P1-to-P2 direction. Connect each transformer to the corresponding terminal pair.
02
App
Download GEYER Smart and connect the phone to a 2.4 GHz Wi-Fi network.
03
Pairing
Press and hold the device button for about 5 seconds until the indicator LED flashes rapidly, then add ER3100CT in the app.
!
ELECTRICAL SAFETYInstallation and electrical connection must be performed by a qualified electrician, with the power supply isolated and in accordance with the wiring diagram.
WIRING DIAGRAM
Three-phase supply and three split-core current transformers.
With the power supply isolated, connect N, L1, L2 and L3 as shown. Open each split-core current transformer, position it around the corresponding live conductor, close it securely and observe the P1-to-P2 direction. Connect it to B1/R1, B2/R2 or B3/R3.
FREQUENTLY ASKED QUESTIONS
The essential answers.
What does ER3100CT measure?+
It provides values per phase, total active and reactive power, overall power factor, and total, forward and reverse active energy.
Does it switch the circuit remotely?+
No. ER3100CT is intended for energy measurement and has no relay output for remote load switching.
How are the three phases measured?+
One external split-core current transformer is installed on each phase conductor, observing the P1-to-P2 direction.
Does it connect to 5 GHz Wi-Fi?+
No. It connects to a 2.4 GHz Wi-Fi network.
Can the device be shared?+
Yes. It can be shared with up to 20 users.
Who should install ER3100CT?+
Installation and electrical connection must be performed by a qualified electrician.
VIDEO
Product videos.
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Video content coming soon
TESTIMONIALS
Three-phase energy use becomes easier to understand.
Experiences from users monitoring three-phase installations.
01“
The three split-core current transformers let me view each phase separately without routing the load through the meter. This makes it easy to identify imbalances in the distribution board.
Maria P.Electrician
02“
I use the history to see when my business consumes the most energy and how the load is distributed across the three phases.
Andreas K.Business owner
03“
I can check the three-phase supply and total consumption from my phone. The daily, monthly and yearly data are all available in one place.
Eleni M.Homeowner
ER3100CT DOCUMENTATION
All product documents in one place.
PDF
DatasheetTechnical specifications
DOWNLOAD ↓
PDF
PDF
Quick GuideEssential installation and pairing steps
COMING SOON
ManualDetailed use and settings
DOWNLOAD ↓
PDF
Product SheetProduct overview and applications
DOWNLOAD ↓