**Model** |
**KM50-C** |

**Accuracy
**
*1 |
**Voltage** |
± 1.0% FS ± 1 digit (at ambient temperature of 23 °C, rated input, and rated
frequency).
However, the accuracy is ± 2.0% FS ± 1 digit for the Vtr line voltage for three-
phase, three-wire power and the Vrs line voltage for single-phase, three-wire
power under the same conditions. |

**Current** |
± 1.0% FS ± 1 digit (at ambient temperature of 23 °C, rated input, and rated
frequency).
However, the accuracy is ± 2.0% FS ± 1 digit for the phase-S current for
three-phase, three-wire power and the phase-N current for single-phase,
three-wire power under the same conditions. |

**Active power Reactive
**
power |
± 2.0% FS ± 1 digit (at ambient temperature of 23 °C, rated input, rated
frequency, and a power factor of 1)
Reactive power formula: Reactive power = v × i × sin θ
* "v" is the instantaneous voltage and "i" is the instantaneous current.
θ is the phase difference between the voltage and current. |

**Frequency** |
± 0.3 Hz ± 1 digit (at ambient temperature of 23 °C, rated input, and rated
frequency) |

**Power factor** |
±5.0% FS ±1 digit (at ambient temperature of 23 °C, rated input, rated frequency,
and Power factor = 0.5 to 1 to 0.5)
Power factor formula: Power factor = Active power/Apparent power
* Apparent power = √ (Active power)^{2} + (Reactive power)^{2} |

**Temperature** |
± 5 °C two hours after the power is turned ON (after setting the offset to match
the ambient environment) |

**Low-cut current set value** |
0.1% to 19.9% of rated current input (in 0.1% increments) |

**Sampling cycle** |
100 ms for measurement voltage at 50 Hz and 83.3 ms for measurement
voltage at 60 Hz |

**Temperature influence *1** |
± 1.0% FS ± 1 digit (percentage of power within operating temperature range,
at ambient temperature of 23 °C, rated input, rated frequency, and power
factor of 1) |

**Frequency influence *1** |
±1.0% FS ±1 digit (percentage of power within rated frequency ±5 Hz, at ambient
temperature of 23 °C, rated input, and power factor of 1) |

**Influence of harmonics *1** |
± 0.5% FS ± 1 digit (at ambient temperature of 23 °C, error for superimposed
2nd, 3rd, 5th, 7th, 9th, 11th, and 13th harmonics for a content percentage of
30% for current and 5% for voltage of the basic wave) |

**Insulation resistance** |
1) Between all power circuits and all of the RS-485 terminals, OUT1, OUT2,
event inputs, I/O commons, and transistor outputs: 20 MΩ max. (at 500 VDC)
2) Between all current and voltage inputs and all of the RS-485 terminals, OUT1,
OUT2, event inputs, I/O commons, and transistor outputs: 20 MΩ max. (at 500
VDC)
3) Between all current and voltage inputs and the front case: 20 MΩ max. (at
500 VDC)
4) Between all power circuits and the front case: 20 MΩ max. (at 500 VDC) |

**Dielectric strength** |
1) Between all power circuits and all of the RS-485 terminals, OUT1, OUT2,
event inputs, I/O commons, and transistor outputs: 2,800 VAC for 1 min
2) Between all current and voltage inputs and all of the RS-485 terminals,
OUT1, OUT2, event inputs, I/O commons, and transistor outputs: 3,600 VAC for
1 min
3) Between all current and voltage inputs and the front case: 3,600 VAC for 1 min
4) Between all power circuits and the front case: 2,800 VAC for 1 min |

**Vibration resistance** |
Single amplitude: 0.35 mm, Acceleration: 50 m/s^{2}, Frequency: 10 to 15 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. 150 g (Power Monitor only) |

**Degree of protection** |
Front panel: IP66 (when mounted to a panel), Rear case: IP20, Terminal
section: IP00 |

**Memory backup** |
EEPROM (non-volatile memory), No. of writes: 1,000,000 times |

**Compliant standards** |
EN61010-1 (IEC61010-1), EN61326-1 (IEC61326-1), UL61010-1, CAN/CSA-
C22.2 No.61010-1 |

**Event
**
inputs |
**Number of inputs** |
Two event inputs
The common terminal is shared with the OUT1 |

**Voltage input** |
High level: 4.75 to 30 VDC
Low level: 0 to 2 VDC
Input impedance: Approx. 2 kΩ |

**No-voltage input** |
ON resistance: 1 kΩ max.
OFF resistance: 100 kΩ min.
ON residual voltage: 8 V max.
ON current (at 0 Ω ): 10 mA max. |

**Minimum input time** |
5 ms |

**Transistor
**
outputs |
**Number of outputs** |
5 open-collector outputs (two total power consumption pulse output or alarm
output, and three, 3-state outputs)
The total power consumption pulse output and alarm output use the same
common terminal.
The three, 3-state outputs use the same common terminal. |

**Output capacity** |
30 VDC, 30 mA max.
ON residual voltage: 12 V max.
OFF leakage current: 100 μ A max. |

**Alarm output delay *2** |
OFF delay: 0.0 to 99.9 s, ON delay: 0.0 to 99.9 s |

**Characteristic
**
operating time *3 |
±200 ms |

**Commu-
**
nications |
**Communications
**
method |
RS-485 (2-wire half-duplex) |

**Sync method** |
Start-stop |

**Unit number setting** |
CompoWay/F: 0 to 99, Modbus: 1 to 99 |

**Baud rate** |
1.2, 2.4, 4.8, 9.6, 19.2, 38.4 kbps |

**Transmission code** |
CompoWay/F: ASCII, Modbus: Binary |

**Data length** |
7, 8 bits |

**Stop bit length** |
1, 2 bits |

**Vertical parity** |
Even, odd, or none |

**Maximum transmission
**
distance |
500 m |

**Maximum number of
**
connected Power
Monitors |
CompoWay/F: 31, Modbus: 99 |

**EMC
**
(Industrial electromagnetic
environment) |
EMI
EN61326-1 |
Radiated RF Electromagnetic Field: CISPR 11 class A
Conducted Emission: CISPR 11 class A |

EMS
EN61326-1 |
Electrostatic Discharge Immunity: EN61000-4-2
Electromagnetic Field Immunity: EN61000-4-3
Fast Transient/Burst Noise Immunity: EN61000-4-4
Surge Immunity: EN61000-4-5
Conducted Disturbance Immunity: EN61000-4-6
Power Frequency Magnetic Field Immunity: EN61000-4-8
Voltage Dip and Interruption Immunity: EN61000-4-11 |