Multi-circuit compact Power Monitor for on panel installation

  • Over 20 years of history in Power Monitoring Technology
  • Compact with multi-circuit capabilities (up to 4 circuits connected to one unit)
  • Solve design, installation, wiring, and commissioning issues with only one model
  • IEC 62053-22 accuracy class 0.5S
  • Push-in plus technology for easy wiring
  • Clear indication in case of incorrect wiring
  • Large, easy-to-read, white and green LCD
  • On panel mounting
  • Bi-directional power measurement

Power Monitor

Applicable circuits and rated voltage

Power supply voltage

Dimensions (W×H×D)


Order Code

Single-phase, 2-wire: 
100 to 277 VAC

Single-phase, 3-wire: 
100 to 240 VAC (L-N) or 200 to 480 VAC (L-L)

Three-phase, 3-wire: 
173 to 480 VAC (L-L)

Three-phase, 4-wire: 
100 to 277 VAC (L-N) or 173 to 480 VAC (L-L)

100 to 240 VAC 
Separate from measurement voltage.

96 × 96 × 64 mm 
(excluding protrusions)

RS-485 communications, 
pulse output




Applicable phase wiring methods

Single-phase two-wire, single-phase three-wire, three-phase three-wire, and three-phase four-wire

Number of measured circuits

Single-phase two-wire: 4 circuits max., Single-phase three-wire or three-phase three-wire: 2 circuits max., 
Three-phase four-wire: 1 circuit

Power supply voltage (operating frequency)

100 to 240 VAC (50/60 Hz)

Power supply allowable voltage range

85% to 110% of rated power supply voltage

Power consumption

7 VA max.


Rated input voltages

Single-phase, 2-wire: 100 to 277 VAC

Single-phase, 3-wire: 100 to 240 VAC (L-N) or 200 to 480 VAC (L-L)

Three-phase, 3-wire: 173 to 480 VAC (L-L)

Three-phase, 4-wire: 100 to 277 VAC (L-N) or 173 to 480 VAC (L-L)

Allowable supply voltage range

85% to 115% of rated power supply voltage

Connectable CTs

General-purpose CT with a rated secondary current of 1 A or 5 A

Maximum CT secondary current

6 A

Rated input frequency

50/60 Hz

Ambient operating temperature

–25 to 55°C (with no condensation or icing)

Ambient operating humidity

25% to 85%

Storage temperature

–25 to 85°C (with no condensation or icing)

Storage humidity

25% to 85%

Operating altitude

2,000 m max.

Installation environment

Overvoltage category II, measurement category II, pollution degree 2

Electromagnetic environment

Industrial electromagnetic environment (EN/IEC 61326-1 Table 2)

Compliant standards

EN 61010-2-030, EN 61326-1, and UL 61010-1


Measured items

Energy consumption (active, regenerative, and reactive), power (active and reactive), current, voltage, power factor, and frequency

Measurement specifications

Active power

0.5% (IEC 62053-22 class 0.5S

Reactive power

2% (IEC 62053-23 class 2)

Sampling cycle

80 ms for 50 Hz and 66.7 ms for 60 Hz

Insulation resistance

(1) Between all electrical circuits and the case: 20 MΩ min. (at 500 VDC)

(2) Between all power supply and voltage inputs and all communications and pulse output terminals: 20 MΩ max. (at 500 VDC)

Dielectric strength

(1) Between all electrical circuits and the case: 1,400 VAC for 1 min

(2) Between all voltage and current inputs and all communications and pulse output terminals: 2,200 VAC for 1 min

Vibration resistance

Single amplitude: 0.1 mm, Acceleration: 15 m/s², Frequency: 10 to 150 Hz, 10 sweeps for 8 min each along three axes

Shock resistance

150 m/s², 3 times each in 6 directions (up/down, left/right, forward/backward)

Indications and operation method

LCD indications and operation buttons


Approx. 350 g (Power Monitor only)

Degree of protection

Front: IP65, Rear case: IP20, Terminal: IP00

Pulse output

Number of outputs

Number of outputs: 4 (photoMOS relay outputs)
Used for the total power consumption pulse output.

Output capacity

50 mA at 40 VDC

ON residual voltage: 1.5 V max. (for output current of 50 mA)

OFF leakage current: 0.1 mA max.

Output unit

Output unit: 1, 10, 100, 1k, 5k, 10k, 50k, or 100k (wh)

Pulse ON time: 500 ms (Cannot be changed.)

Communications interface

Communications method

RS-485 (2-wire half-duplex with start-stop synchronization)

Communications protocol

Modbus (RTU): Binary. CompoWay/F: ASCII

Baud rate

1.2, 2.4, 4.8, 9.6, 19.2, or 38.4 kbps

Data length

Data length: 7 or 8 bits

Stop bits: 1 or 2 bits

Vertical parity: Even, odd, or none

Maximum transmission distance

1,200 m

Maximum number of connected Power Monitors

Modbus: 99, CompoWay/F: 31

If you measure more than one circuit with one Power Monitor, the number of circuits is treated as the number of connected Power Monitors.

Dimensions (W×H×D)

96 × 96 × 64 mm (excluding protrusions)

Installation method

On-panel installation


Instruction Manual and Compliance Sheet, Mounting adapter and waterproof packing

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  • Brand: OMRON
  • Product Code: KM-N3-FLK
  • Availability: In Stock
  • $175.00

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