MODBUS (RS-485) Communication (optional).
Pulse/Limit Switch output (optional).
3 Line 4 Digits ultra bright LED Display (up to 9999).
On-site Programmable CT/PT Ratios.
User selectable CT Secondary 1A/5A.
User selectable PT Secondary from 100 VLL to 500 VLL.
Wide auxillary Power Supply which can accept any input between 40V – 300V AC/DC.
Applications: Alpha 20 Measures important electrical parameters in 3 phase 4 Wire and 3 phase 3 Wire Network & replaces the
multiple analog panel meters. It measures electrical parameters like AC Voltage, AC Current, Frequency, Active,
Reactive, Apparent Power, Import Export Energy & many more.
Input Voltage
Nominal input voltage (AC RMS): Phase –Neutral 290V L-N, Line-Line 500V L-L.
Max continuous input voltage: 120% of rated value.
Nominal input voltage burden: < 0.3 VA approx. per phase (For external auxiliary meter).
System PT secondary values: 100VLL to 500VLL programmable on site.
System PT primary values: 100VLL to 692kVLL programmable on site.
Input Current
Nominal input current: 5A / 1A AC RMS.
System CT secondary values: 1A & 5A programmable on site.
System CT primary values: From 1A up to 9999A (for 1 or 5 Amp).
Max continuous input current: 120% of rated value.
Nominal input current burden: < 0.2 VA approx. per phase.
Auxiliary Supply
External Aux: 40V – 300V AC-DC (± 5 %).
Self powered: Input voltage range from 80% to 100% of Rated value. (Self powered meter is available only in 3Phase 4 Wire and Single Phase network.) Auxiliary input is derived from Phase 1 (R phase)
Frequency range: 45 to 65 Hz.
VA burden: < 4 VA Approx.
Overload Withstand
Voltage: 2 x rated value for 1 second, repeated 10 times at 10 second intervals.
Current: 20x rated value for 1 second, repeated 5 times at 5 min intervals.
Operating Measuring Ranges
Voltage Range With External Aux: 10… 120% of rated value.
Voltage Range With Self Power: 80… 120% of rated value.
Current Range: 10 … 120% of rated value.
Frequency: 45…65 Hz.
Power Factor: 0.5 Lead … 1 … 0.5 Lag.
Dimensions and Weights
Bezel size: 96mm x 96mm DIN 43718.
Panel cut-out: 92+0.8mm x 92+0.8mm.
Overall depth: 55mm.(without output option).
Panel Thickness: 1-3mm for self clicking, 1–6mm for swivel screws.
Weight: 320 gm. Approx.(with output option).
