Omron KM-N3-FLK Multi-Circuit On-Panel Power Monitor

Technical Overview

The Omron KM-N3-FLK is a multi-circuit digital power monitor designed for robust on-panel installation. This highly accurate electric energy monitor complies with IEC 62053 international standards (Class 0.5S precision). It features a large, easy-to-read white LCD and Push-In Plus terminal blocks for fast, reliable wiring. Capable of extensive multi-circuit metering, a single unit can measure up to four 1-phase 2-wire circuits, or two 3-phase 3-wire / 1-phase 3-wire circuits. The device integrates seamlessly into industrial networks via Modbus RTU or CompoWay/F over an RS-485 connection and utilizes standard 1A or 5A secondary-side general-purpose Current Transformers (CTs) rather than proprietary models. It also includes 4 ports for pulse outputs to accurately track active energy consumption thresholds across multiple lines.

Key Features

Multi-circuit capability capable of measuring up to four circuits (1-phase 2-wire) or two circuits (3-phase 3-wire) [1.4].
High-precision IEC Class 0.5S measurements compliant with IEC 62053 international standards for electrical metering.
Compatible with standard general-purpose Current Transformers (CTs) with a 1 A or 5 A secondary output (rated load of at least 1.0 VA).
RS-485 communication terminal supporting both Modbus RTU and Omron CompoWay/F standard protocols.
Four independent pulse output ports for real-time active energy threshold monitoring (500 ms Pulse ON time).
Push-In Plus terminal blocks for RS-485 and pulse outputs, significantly reducing wiring time and errors.
Clear, high-visibility white LCD display designed for direct control panel mounting.

Technical Specification Matrix

Parameter	Value
Mounting Type	On-panel installation
Display Type	High-visibility White LCD
Maximum Metering Circuits	Up to 4 circuits (1-phase 2-wire) or 2 circuits (1-phase 3-wire / 3-phase 3-wire)
Supported Communications	RS-485 (Modbus RTU, CompoWay/F)
Max Transmission Distance	1200 m (RS-485)
Pulse Outputs	4 ports (500 ms Pulse ON time)
Current Transformer (CT) Compatibility	General-purpose CTs (1 A or 5 A secondary-side output)
Power Consumption	7 VA max.
Accuracy Standard	IEC 62053 (IEC Class 0.5S)

Industrial Applications

1. Factory Multi-Circuit Machine Monitoring

Installing the KM-N3-FLK to monitor the active power usage of multiple production machines from a single centralized control panel, routing the network via RS-485 Modbus RTU to a central PLC or SCADA system.

Problem Solved

Replaces the need for multiple single-circuit analog/digital meters, drastically reducing control panel space requirements, hardware costs, and complex wiring configurations.

Multi-circuit meteringModbus RTURS-4851-phase 2-wireIEC Class 0.5S

2. Building Distribution Board Energy Profiling

Deploying the power monitor directly onto commercial distribution boards to continuously measure the power consumption of distinct zones, such as HVAC, lighting, and auxiliary utility systems.

Problem Solved

Provides facility managers with granular, multi-zone insights into energy demand and allows the four pulse output ports to seamlessly interface with Building Management Systems (BMS) for real-time energy threshold alerts.

Pulse output3-phase 3-wireActive energy thresholdCompoWay/FPush-In Plus terminal

3. Global Standardized Switchgear Integration

Integrating the monitor into OEM switchgear intended for international export, leveraging its compliance with international accuracy standards and versatile CT compatibility.

Problem Solved

Eliminates the logistical burden of stocking region-specific power meters or proprietary Omron CTs, streamlining the global supply chain by ensuring generic 1A/5A CT compatibility across diverse electrical grids.

IEC 62053General-purpose CTs (1A / 5A)On-panel mounting7 VA max power consumption