KM-N2

Features

Multi-circuit compact power monitor for in-panel installation

  • Over 20 years of experience 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.
  • Automatic LED and acoustic alarm in case of incorrect wiring.
  • Large, easy-to-read, white LCD.
  • DIN-rail mounting.
  • Bi-directional power measurement.
Specifications & ordering info

Ordering information

Applicable circuits and rated input voltage

Power supply voltage

Dimensions (W×H×D)

Communications

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

Rated input voltage 85 to 115%

90 × 65 × 90 mm

RS-485, Modbus (RTU) or
CompoWay/F

KM-N2-FLK

Specifications

Ratings

Applicable circuits

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

Maximum number of measured circuits1

Single-phase two-wire: 4 circuits, single-phase three-wire or three-phase three-wire: 2 circuits, three-phase four-wire: 1 circuit

Rated input voltages (power supply 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: 100 to 277 VAC (L-N) or 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 and input voltage range

85% to 115% of rated power supply voltage

Power consumption

7 VA max.

Input current (CT2 primary-side current)2

General-purpose CT: 1 A or 5 A

Rated load: 0.5 VA min.

Rated input frequency

50/60 Hz

Allowable input current

6 A max.

Ambient operating temperature

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

Storage temperature

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

Ambient and storage humidity

25% to 85%

Operating altitude

2,000 m max.

Installation environment

Overvoltage category II, pollution degree 2, measurement category II

Electromagnetic environment

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

Compliant standards

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

Performance

Measurement specifications

Active power

IEC 62053-22 class 0.5S (Accuracy ±0.5% F.S. ±1 digit)3

Reactive power

IEC 62053-23 class 2 (Accuracy ±2% F.S. ±1 digit)1

Sampling cycle

80 ms for 50 Hz and 66.7 ms for 60 Hz

Measured items

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

Insulation resistance

  • Between all electrical circuits and the case: 20 MΩ min. (at 500 VDC)
  • Between all power supply and voltage inputs and all communications and pulse output terminals:: 20 MΩ max. (at 500 VDC)

Dielectric strength

  • Between all electrical circuits and the case: 2,200 VAC for 1 min
  • 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/s 2 , Frequency: 10 to 150 Hz, 10 sweeps for 8 min each along three axes

Shock resistance

150 m/s 2 , 3 times each in 6 directions (up/down, left/right, forward/backward)

Weight

Approx. 350 g (Power Monitor only)

Degree of protection

IP20

Installation method

DIN Rail mounting

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

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 m1

Maximum number of connected Power Monitors

Modbus: 99, CompoWay/F: 31


1. A CT with a different capacity can be specified for each circuit.

2. The KM-series CTs (the KM20-CTF or KM-NCT series) cannot be used. Use general-purpose CTs with a secondary-side output of 1 A or 5 A.

3. The error of the CT or VT is not included.

1. A CT with a different capacity can be specified for each circuit.

2. The KM-series CTs (the KM20-CTF or KM-NCT series) cannot be used. Use general-purpose CTs with a secondary-side output of 1 A or 5 A.

3. The error of the CT or VT is not included.

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