Four variants
Enhanced, standard, economy and basic variants. All measure three-phase current. Use the selection table to compare voltage, power, energy and harmonic functions.
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APM SERIES
APM-440
Digital power meter
LED panel meter for three-phase electrical measurements. Energy and harmonic functions vary by model.
Product features
Display and communications
Three-row LED display, two digital inputs and relay outputs depending on variant. Connects to monitoring systems over RS485 / Modbus RTU.
Mounting and wiring
96 × 96 mm front panel and 85 × 85 mm cutout. Select CT secondary current, frequency and auxiliary supply when ordering.
Product test reports
- Inspection report PDF · 3.3 MB
Where it fits and why
Match the variant to full electrical measurements, current only, or current plus energy metering.
Variant comparison
APM-440E
Three-phase electrical quantities, energy metering and total harmonic distortion.
APM-440
Three-phase electrical quantities and energy metering for standard feeders.
APM-440C
Three-phase current and energy metering.
APM-440K
Three-phase current only. Relay outputs are not listed in the catalog matrix.
√ Included · ● Optional · — Not listed
| Function | APM-440E | APM-440 | APM-440C | APM-440K |
|---|---|---|---|---|
| Phase voltage | √ | √ | — | — |
| Line voltage | √ | √ | — | — |
| Current | √ | √ | √ | √ |
| Active power | √ | √ | — | — |
| Reactive power | √ | √ | — | — |
| Apparent power | √ | √ | — | — |
| Power factor | √ | √ | — | — |
| Frequency | √ | √ | — | — |
| Active energy | √ | √ | √ | — |
| Reactive energy | √ | √ | √ | — |
| Accuracy (%): I, U / Ep | 0.2/0.5S | 0.5/1.0 | 0.5/1.0 | 0.5 |
| Digital inputs | 2 | 2 | 2 | 2 |
| Digital outputs | 2 | 2 | 2 | — |
| Total harmonic distortion | √ | — | — | — |
| RS485 communications | √ | √ | √ | √ |
| Display | LED | LED | LED | LED |
Drawing and panel checks
- 96 × 96 mm front, 85 × 85 mm cutout. Select auxiliary supply when ordering.
- Verify CT secondary, frequency, auxiliary supply and relay outputs. Record the RS485 address and measurement points on the drawings and point list.
