Compere - KPM31 – Single-Phase DIN Rail Smart Energy Meter (WiFi / 4G / LoRaWAN)
 
The Compere KPM31 Single-Phase DIN Rail Smart Energy Meter is a high-precision, multifunctional energy monitoring device designed for residential, commercial, microgrid, and prepaid metering applications.
 
Built with an advanced integrated DSP measurement chip, the KPM31 delivers accurate energy measurement, prepaid functionality, multi-rate billing statistics, and flexible communication options including RS485, WiFi, 4G LTE, and LoRaWAN.
The meter supports automated data collection, remote control, and network disconnection continuation, helping to reduce manual meter reading errors while improving billing accuracy and energy management efficiency.
 
Key Features:
High-precision single-phase energy meter with integrated DSP technology
Direct-connect meter up to 80A (no external CTs required)
Measures:
Single-phase voltage and current
Active, reactive, and apparent power
Active, reactive, and apparent energy
Power factor
Frequency
Four-quadrant energy statistics
Multi-rate energy billing capability
Up to 5 tariff rates per day
14 time zones per year
24 time periods per day
Up to 8 time period tables
12-month frozen energy consumption data record
Prepaid functionality with built-in magnetic latching relay
Remote charging and load control
Energy data disconnection and continuation function
Storage of up to 7 days of 15-minute interval energy data
Automatic data supplementation after network reconnection
LED pulse output
1 channel passive optocoupler pulse output
Built-in real-time clock with maintenance-free battery
35mm DIN rail mounting for quick and easy installation
 
Communication Options – KPM31 Series:
The KPM31 supports multiple communication methods to suit different project requirements:
RS485 (Standard) – Modbus-RTU protocol
WiFi Communication Version
4G LTE Communication Version (CAT1 module)
LoRaWAN Communication Version
 
Important: Only one wireless communication option (WiFi / 4G / LoRaWAN) can be selected per meter.
 
Supported protocols:
Modbus-RTU
MQTT (optional for WiFi / 4G versions)
Meters with WiFi or 4G include built-in communication hardware – no external modem required.
 
Infrared communication is supported for easy WiFi/4G configuration and APN settings.
 
Prepaid & Remote Control Functions:
Integrated magnetic latching relay for load switching
Remote power on/off control
Supports prepaid metering and remote top-up
Ideal for tenant billing and energy management systems
 
Technical Specifications:
Measurement Capabilities
Voltage and current
Active / reactive / apparent power
Power factor
Frequency
Active and reactive energy
Four-quadrant energy statistics
 
Input Ratings:
Rated Voltage: AC 110V / 220V
Rated Current: 0.2 – 80A direct input
Frequency Range: 45 – 65 Hz
 
Accuracy:
Voltage: ±0.2%
Current: ±0.2%
Active Power: ±0.5%
Reactive Power: ±2.0%
Active Energy: Class 1.0 (Level B)
Reactive Energy: ±2.0%
Power Factor: ±0.5%
Frequency: ±0.02 Hz
 
Communication:
Interfaces: RS485 / WiFi / 4G / LoRaWAN
Protocols: Modbus-RTU, MQTT
Baud rate: 1200 – 9600 bps
 
Electrical Characteristics:
Operating Voltage: AC 110V / 220V
Overall Power Consumption: <2VA
Power Frequency Withstand Voltage: AC 2kV/min
Insulation Resistance: >50MΩ
Impact Voltage: 5kV (1.2/50µs)
 
Environmental Specifications:
Operating Temperature: –10°C to +55°C
Storage Temperature: –20°C to +75°C
Relative Humidity: 5% – 95% (non-condensing)
Maximum Altitude: ≤3000 m
 
Mechanical & Installation:
Standard 35mm DIN rail mounted
Compact modular design
Dimensions: 101 × 77 × 76 mm
Backlit LCD display
Easy installation and maintenance
 
Applications:
Prepaid electricity billing
Residential and commercial energy monitoring
Microgrid power measurement
Automatic meter reading
Remote load control
Smart building energy management
 
Available Product Variants:
Choose the model best suited to your communication requirements:
KPM31-RS485 – Standard Modbus-RTU version
KPM31-WiFi – Built-in WiFi communication
KPM31-4G – Integrated 4G LTE communication
KPM31-LoRa – LoRaWAN communication
KPM31B – Prepaid remote control version
(Custom configurations available – specify options when ordering)
 
Key Advantages:
High measurement accuracy
Direct-connect up to 80A
Built-in prepaid functionality
Multiple wireless communication options
Data continuity after network loss
Compact DIN-rail design
Ideal for smart metering and IoT integration
 
Lead Time:
3-5 Days