Rating/ Performance

General specifications

Item Specification
Supply voltage range 100-240V AC
Rated frequency 50 / 60Hz
Nominal power consumption 15VA approx. (240V AC at 25 ℃ +77 ℉)
Inrush current 30A or less (240V AC/DC at 25 ℃ +77 ℉)
Allowable momentary power-off time 10ms
Ambient temperature Operation at -10 to +50 ℃ +14 to +122 ℉
Storage at -25 to +70 ℃ -13 to +158 ℉
Ambient humidity 30 to 85%RH (at +20 ℃ +68 ℉) non-condensing
Breakdown voltage (initial) Between the isolated circuits: 2,000V / 1min
a) enclosure ↔ all terminals
b) primary insulated circuits ↔ secondary insulated circuits
(Double insulation)
• power supply terminals ↔ other terminals
• voltage input terminals ↔ other terminals
Insulation resistance (initial) Between the isolated circuits: 100 MΩ or more
Vibration resistance 10 to 150Hz (7.5 minutes/cycle) single amplitude:0.075mm (1h on 3 axes)
10 to 55Hz (1 minute/cycle) single amplitude:0.375mm (1h on 3 axes)
Shock resistance Min. 294m/s2 (5 times on 3 axes)
Display method LCD with backlight
Display updated cycle 500, 1,000, 2,000, 3,000 ms (set with setting mode)
Power failure memory method
(when power is off)
Internal memory
Sea level altitude Under 2,000m
Overvoltage category III
Pollution degree 2
Dimensions W/H/D Main unit 85 x 140 x 65 mm
3.346 × 5.512 × 2.559 in
Expansion unit 85 x 70 x 65 mm
3.346 × 2.756 × 2.559 in
Weight Main unit 450 g approx.
Expansion unit
(Power measurement)
200 g approx.
Expansion unit
(Digital I/O, Multi analog input)
140 g approx.
Calender timer*1 Range January 1, 2015 00:00:00 to December 31, 2099
23:59:59 (leap year supported)
Time accuracy Monthly accuracy Max. 15 sec. (at 25 ℃ +77 ℉)
Back up period About 1 month
(by secondary battery when power off after 48-hours
or more of power on time, at +23 ℃ +73.4 ℉)

*1 only KW2M-X

Measurement items (for AKW263100A, AKW264100A and AKW272100A)

Item Display data range
Instantaneous power (Active, Reactive, Apparent) -999.99P to 999.99P (W, var, VA)
Total integral power (import) (Active, Reactive, Apparent) 0.000k to 9999.9P (Wh, varh, VAh)
Total integral power (export) (Active, Reactive) 0.000k to 9999.9P (Wh, varh)
Current 0.000 to 999.99k (A)
Voltage 0.00 to 9999.9k (V)
Power factor -1.000 to 0.000 to 1.000
Frequency 0.00 to 99.99 (Hz)
Pulse count value 0.000 to 999999
Power conversion value 0.000k to 9999.9P
Leakage current 0.0000 to 99999.9999 (A)
Unbalanced current (Each phase) 0.00 to 300.00 %
Unbalanced voltage (Each phase) 0.00 to 300.00 %
Current THD (total harmonic distortion) (Each phase) 0.00 to 400.00 %
Voltage THD (total harmonic distortion) (Each phase) 0.00 to 400.00 %
Current harmonics (2nd to 31st ) (Each phase) 0.00 to 400.00 %
Voltage harmonics (2nd to 31st ) (Phase, Line) 0.00 to 400.00 %
Hour Meter (ON-time, OFF-time, Stand-by time, Maintenance time) 0.0 to 99999.9 h
demand *1
Active, Reactive, Apparent,
Active (export), Reactive (export)
0.000k to 999.99M (W, var, VA)
Current 0.000k to 999.99k (A)

* 'Display data range' is the range to be able to indicate with the main unit display, it is not a range that can be measured.
* If the voltage to be measured is not the rated frequency (commercial frequency), it may take time to stabilize THD (total harmonic distortion).
*1 Please use this demand function as your standard.
The demand value calculated with this function is not guaranteed.

Accuracy (for AKW263100A, AKW264100A and AKW272100A)

Item Specifications
Electrical power ±0.5% Active power Compliant Class 0.5S (IEC 62053-22)
Reactive power Compliant Class 2 (IEC 62053-23)
Current ±0.2%*1
±0.5% for 2(N)-phase of 1P3W and 2(S)-phase of 3P3W.
Voltage ±0.2% ±0.5% for 2-phase of 1P3W, 3-1 voltage of 3P3W and line voltage of 3P4W.

*1 When it measures current under 5% of rating, it may not satisfy the accuracy according to setting of CT. (Max.error 0.5%) The tolerance of CT sensor and VT(instrument voltage transformer) are not included.

Output specifications (for AKW263100A, AKW264100A and AKW274240A)

Item Specifications
Number of output point Main unit 2 points (insulate between output terminals)
Expansion unit (Digital I/O) 4 points (insulate between output terminals)
Insulation method MOSFET relay
Output type 1a
Output capacity 100mA, 30V AC/DC
Output mode (OUT1/OUT2) • Pulse by integral power
• Output by alarm or events (set with setting mode)

Digital input specifications (for AKW263100A, AKW264100A and AKW274240A)

Item Specifications
Number of input point Main unit 1 point
Expansion unit (Digital I/O) 2 points
Insulation method Designated insulation for input (insulate to the other functions)
Input method Contact/ non-voltage a contact or open-collector
Input signal Non-voltage • Impedance; Max. 1kΩ
(when short-circuit current: Max. 10mA)
• Residual voltage when shorted; Max. 3V
• Impedance when open: Min. 100kΩ
Input mode Pulse input
Synchronized with input from outer device*1
Measure maintenance time*1
Max. counting speed 2000Hz / 30Hz
Min. input signal width 0.25ms (when 2000Hz is set) / 16.7ms(when 30Hz is set)
ON:OFF ratio=1:1

*1 Only KW2M-X

Analog input specifications (for AKW273230A)

Item Specifications
Input channel 3 channels
Input range
(select with setting mode)
Voltage 0 to 60V
Current 0 to 20mA / 4 to 20mA (set with setting mode)
Resolution 24bit
Total accuracy Within ±0.1%F.S.(at +25℃ +77 ℉),
Within ±0.3%F.S.(at -10 to +50℃ +14 to +122 ℉)

RTD input specifications (for AKW273230A)

Item Specifications
Input channel 2 channels
Input range PT100 -200.0 to +200.0 ℃ -128.9 to +93.3 ℉
PT1000 -200.0 to +200.0 ℃ -128.9 to +93.3 ℉
Resolution (24bit) 0.1 ℃
Total accuracy CH1 Within ±0.3%F.S.(at +25 ℃ +77 ℉), Within ±0.5%F.S.(at -10 to +50 ℃ +14 to +122 ℉)
CH2 Within ±0.5%F.S.(at +25 ℃ +77 ℉), Within ±1.0%F.S.(at +10 to +40 ℃ +50 to +104 ℉),
Within ±1.5%F.S.(at -10 to +50 ℃ +14 to +122 ℉)

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