3-Phase Meter Telstar CT - Current Transformer Version

The smart-me Telstar CT is a MID energy meter with external inputs for current transformers and integrated WiFi interface for transmitting real-time data with external current transformer inputs. The meter connects smart-me cloud and automatically synchronises the data in an encrypted format. This is the easiest way of visualising energy consumption in real time, billing the energy use and intelligently controlling your own consumption. Using the smart-me cloud, the collected measurement data can be exported to and processed in a variety of third-party systems.


  • Inputs for external current transformers from 0.01 to 6A output

  • Encrypted real-time data connection to the intelligent smart-me cloud

  • Remote switches, time switches and condition-based switches via the outputs

  • Comprehensive energy data management and visualisation, automatic billing as well as intelligent control and alarms using the smart-me cloud

  • Floating contact outputs for controlling external devices (one of them with an integrated 8A relay)

  • Floating contact input for tariff signal or digital input

  • Easy installation with the free smart-me app for Android and iOS

  • Interface to a variety of third-party systems such as billing and building management systems as well as smart home systems (via API, CSV, MSCONS, IS-E or Modbus TCP)


Before you can use your smart-me device, you have to connect it to your Wi-Fi network.

  1. Connect your smartphone or tablet to the WLAN.

  2. Download and install the free smart-me app from the App store on Android or iOS.

  3. Start the app and create a free accoun or login into an existing relevant account.

  4. Click on “Add Device” (+) and follow the instructions.

Technical Data

Operating voltage 3x230/400VAC

Current input range Imin-Iref(Imax): 0.01-1(6)A

Product certification CE, MID 2014/32/EU, CH load profile/reactive energy, RED

CT ratio 1:1 to 20'000:1 or 5:5 to 20'000:5

Accuracy class Class B (1%)

Meter type Four-quadrant meter (purchase and delivery) for active and reactive energy

Measured values Active energy (kWh), active power (kW), reactive energy (kVArh), reactive power (kVAr), current (A), voltage (V), power factor (cosφ), switch status

Tariffs Two via digital tariff input or use of any virtual tariffs in the cloud

Digital input Floating input, tariff input (12 VDC - 48VDC / 12VAC - 230 VAC)

Digital output S-0 Floating outputs (SG ready), max. 48VDC / max. 230 VAC, Pmax < 0.4 W (Opto-MOSFET)

Digital outputs S-1 Floating outputs (SG ready), max. 48VDC, max. 230VAC, Pmax < 1500 W (Relais)

WiFi standard 802.11 b/g/n

WiFi security standard WEP, WPA-PSK/WPA2-PSK

S0 pulse weight 1,000 pulses per kWh (configurable to 10,000 pulses/kWh)

Data storage Two months

Temperature range -25 to +70°C

Measuring device category CAT III

IP class IP 20 (clamps), IP 51 (housing)

Dimensions Five modules, 90 x 90 mm

Rel. humidity Average 75%, without condensation / short term 95%, without condensation

Assembly DIN rail

Server location Switzerland

Configuring inputs and outputs

The smart-me meter has two outputs and one input, which can be used as pulse inputs and outputs or as a switchable potential-free contact. Details can be found here.


The counter has a rolling display. The items described below are displayed one after the other. After the last point, it starts again at point 1:

  1. Meter reading (OBIS code followed by meter reading)

1.8.1 (A +) Active energy import tariff 1

1.8.2 (A +) Active energy import tariff 2

2.8.1 (A-) active energy delivery tariff 1

2.8.2 (A-) active energy delivery tariff 2

1.8.0: 5A (A +) active energy total import 5A basis

2.8.0: 5A (A-) active energy total delivery 5A basis

5.8.0 (Q1) Inductive reactive energy import total

6.8.0 (Q2) Total capacitive reactive energy import

7.8.0 (Q3) Total inductive reactive energy delivery

8.8.0 (Q4) Total capacitive reactive energy delivery

  1. Converter factor (OBIS code followed by information)

0.4.2 Converter factor (including S0 pulses / kWh)

  1. Firmware (OBIS code followed by information)

C.1.6 Ch: 2218 firmware checksum

0.2.0 V 1.1 firmware version

  1. Error display (OBIS code followed by error messages)

C.60.9 Fraud Flag (possible attempted fraud detected)

PhL: 1 only phase L1 connected

PhL: 2 only phase L2 connected

PhL: 3 only phase L3 connected

PhL: 23 Phase L1 not connected

PhL: 13 Phase L2 not connected

PhL: 12 phase L3 not connected

Correct phase sequence: Numbers light up statically

Incorrect phase sequence: numbers are flashing

Measurements and Wiring

Dimensions [mm]

Wiring diagram

T1 button for installation

T2 special functions

In short: If T2 is pressed> 2s, the green LED lamp switches on / off. If this is activated, it shows the connection status

Glowing green: connected to smart-me cloud

Flashing green: connection is currently established, at the moment no connection

Long: If T2 is pressed> 8s, the display of the power is switched between active and reactive power. In addition, the calibration pulse LED alternates between active energy and reactive energy.

Very long: If T2 is pressed> 14s, the S0-0 pulse output is switched between active power and reactive power.

ATTENTION: This setting only changes the display, not in the smart-me cloud (app and website). If the reactive energy is to be displayed in the cloud, this must be done in the general settings.

E1 tariff input, potential-free

Tariff 1: 0V (or not connected)

Tariff 2: 12 - 48VDC / 12 - 230VAC

adjustable as a digital input

S0-0 S0 pulse output, potential-free

Power MOSFET with PMAX = 0.4 W

adjustable as a digital output

S-1 power output, potential-free

Relay with PMAX = 1,500 W

Measured values (Obis codes)

The following measured values are recorded by the meter and can be accessed in the cloud and via the API.

Messwerte (inkl. Obiscodes) 3-Phasen Zähler V1

Downloads and certificate of conformity

Here you will find data sheets, quick starter guides and other documentation for this product.

Current Transducers and Accessories

CT's and Accessories