AMS B2x-Fx for active, reactive and apparent energy, multirate, with RTC and data profiles

Single-phase static electricity meters AMS B2x-Fx are determined for measurement of active, reactive and apparent energy, instantaneous active, reactive and apparent maximum demand, voltage, current and P.F. in 2-wire networks in direct connection. They enable measurement of energy in rates controlled by internal clock (up to 4 rates) or externally controlled in two rates. The measured values stored in registers according to the OBIS codes are displayed on LCD in cyclic or stepping mode. The electricity meters can be parametrized and readout by using optical probe AMOS type and software supplied by the manufacturer. The testing pulses are signalling by a red LEDs separately for active and reactive energy. The meters can be produced in version with measurement in summary mode (measurement „using an unidirectional mechanical register“) or with measurement in separation mode (measurement of “consumption – supply”).


  • Measurement  of energy, power, voltage, current, power factor ... (+A, -A, +Ri, -Ri, +Rc, -Rc, +R, -R, +S, -S, +P, -P, Pmax, U, I, cos j...);
  • Removable and adjustable upper hinge is included in the package;
  • Historical records of the selected registers, created in the end of month - maximum 15 month historical records;
  • Event records (about influence of magnetic field, missing voltage, covers removal,...) – number of events with date of their occurrence;
  • Data record in three independent profiles with selectable channels (20 channels);
  • Passive impulse SO outputs (particularly for active and reactive energy);
  • Communication interface: optical and RS485;
  • Welded case on a customer request;
  • Compliance 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);
  • Electricity meter is delivered with conformity assessment (initial verification) for active energy billing purposes.

Technical data

Accuracy class

A, B (MID); 2, 1 (EN 62053-21);
2 and 3 for reactive energy (IEC 62053-23)
Reference voltage [V] 220, 230, 240 (-30,+15%)
Reference frequency [Hz] 50 (± 2 %)
Reference current Iref [A]
5 and 10
Transient current ltr [A]
0,5 and 1 
Starting current Ist [A]  ≤ 0,02 and 0,04 
Minimal current Imin [A]
0,25 and 0,5 
Maximal current Imax [A]
60 (DIN terminal block)
100 (BS terminal block) 
Power consumption - voltage circuit  [VA/W] ≤ 3,0 / 1,7 (including RS 485)
Power consumption - current circuit [VA] ≤ 0,02
Impulse constatnt for test output kTO [imp/kWh] Standard value: 5000; 
Adjustable by the manufacturer: 1 - 30000
Transistor output SO 24 V / 30 mA
Operating temperature  - 40 °C up to + 70 °C
Mean temperature coefficient [%/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  IP53 
Fixing holes distance - w x h [mm] BS (DIN) 104 - 112 x 115 - 155
(92 - 112 x 115 - 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