AMS B1x-FAx for active energy measuring, multirate, with RTC

Single-phase static electricity meters AMS B1x-FAx are determined for direct and indirect measurement of active energy and displaying values on LCD, with measurement of instantaneous RMS values of voltage, current and P.F. The measured values are stored into special registers marked according to the OBIS codes. In cyclic mode the energy at max. 4 rates is displayed, in step mode which is controlled by button are displayed also other measured values. In the meter memory are stored the last 15 records of the total and rate energy registers, maximum demands, voltage outages, reverse energy flow, error events. They are equipped with internal real time clock (RTC) which is used for switching of maximum four rates. The electricity meters can be parametrized and readout by using optical probe AMOS type and software supplied by the manufacturer. The test pulses indicated by red LED are proportional to the consumed energy. The meters can be produced in version with energy measurement in summary mode (measurement „using an unidirectional mechanical register“) or with measurement in separation mode (measurement of “consumption – supply”).


  • The meters can be mounted on the DIN rail (the clips only on request);
  • Removable and adjustable upper hinge is included in the package;
  • Passive transmitting pulse SO output for remote transmission;
  • Measurement of the energy, power, voltage, current, P.F. ...;
  • Historical records  –  up to 15 month records;
  • Event records (about influence of magnetic field, missing voltage, covers removal,...) – number of events with date of their occurrence;
  • Complies with IEC/EN 62052-11, IEC/EN 62053-21; EN 50470-1, EN 50470-3 and with requirements of European Parliament and EC Directive 2014/32/EU (MID);
  • It is supplied initially verificated for billing measurement.

Technical data

Precision class A or B (according to MID),
2 or 1 (accord. to EN 62053-21)
Reference voltage [V] 120, 220, 230, 240
Nominal frequency [Hz] 50 or 60
Reference current Iref [A]
direct connection
5 and 10 
Nominal current In [A]
indirect connection

Transient current Itr [A]
direct/indirect connection
0,5 and 1 / 0,25
Starting current Ist [A]
 direct/indirect connection
≤ 0,02 a 0,04 / 0,01
Minimal current Imin [A]
direct/indirect connection
0,25 a 0,5 / 0,05
Maximal current Imax [A]
direct/indirect connection
40, 60, 80 (BS), 100 (BS) / 6; 7,5; 10
Power consumption - voltage circuit [VA/W] ≤ 7,8 VA/0,8 
Power consumption - current circuit [VA] ≤ 0,1
Impulse constant for test output kTO [imp/kWh]
1 – 10 000, normally 5 000
Impulse constant for impulse output kSO [imp/kWh]
kSO = kTO / RSO; normally 2 500
Transistor output SO 24 V / 30 mA
Operating temperature -40 °C up to +70 °C
Mean temperature coeff. [%/K] ≤ 0,04
Terminals current; voltage ; auxiliary [mm] BS (DIN) ø 8 ; ø 3 ; ø 3 (ø 7 ; ø 3 ; ø 3)
Degree of protection IP54 
Fixing holes distance - w x h [mm] BS (DIN) 104 - 112x115 - 155
(92 - 112x115 - 155)
Meter dimensions - w x h/h´x d [mm] BS (DIN) 130 x 129/190 x 60
(130 x 122/171 x 60)
Weight [kg] ≤ 0,6