Compere KPM37 – Three-Phase DIN Rail Smart CT Power Meter (WiFi / 4G / LoRa)
 
The Compere KPM37 Three-Phase DIN Rail Smart Power Meter is a compact, high-precision CT-operated energy monitoring solution designed for industrial, commercial, and system integration applications.
 
It integrates advanced measurement functionality including three-phase electrical parameter monitoring, harmonic analysis up to the 31st order, demand statistics, and flexible communication options.
 
With expandable inputs and outputs, temperature and residual current measurement, and multiple connectivity choices, the KPM37 provides a powerful and versatile metering platform for modern energy management systems.
 
Designed for DIN-rail installation, the KPM37 is ideal for projects with limited or challenging installation space, retrofit upgrades, and smart building automation.
 
Key Features:
CT-operated three-phase energy meter (external current transformers required)
Measures:
Three-phase voltage and current
Active, reactive, apparent power
Four-quadrant energy
Power factor and frequency
Demand, maximum and minimum values
Harmonic analysis from 2nd to 31st order for detailed power quality monitoring
Running time and loading time statistics
Max/Min demand tracking and data logging
Programmable CT and PT transformation ratios
Clear 7+1 digit LCD display for real-time readings
 
Communication Options:
The KPM37 supports multiple communication methods to suit different project requirements:
RS485 (standard) with Modbus-RTU protocol
WiFi (optional)
4G LTE (optional)
LoRa (optional)
 
Important: Only one wireless communication option (WiFi / 4G / LoRa) can be selected per meter.
 
Additional protocol support:
Modbus-RTU
TCP/IP
MQTT for cloud-based applications
 
Meters equipped with WiFi or 4G include built-in communication hardware – no external modem required.
 
Expandable I/O Functions (Optional Modules):
The KPM37 can be expanded with additional functionality:
2 × Digital Inputs (DI)
2 × Relay Outputs (DO)
4 × Temperature measurement inputs
1 × Residual current measurement channel
These options allow integration with alarms, automation systems, and protective devices.
 
Smart Data Functions:
15-minute interval energy data storage for up to 7 days
Data continuity after network disconnection
Remote control and monitoring via MQTT or Modbus
Programmable logic alarms and outputs
Real-time load and power quality analysis
 
Technical Specifications:
Measurement Capabilities
Phase voltage and current
Active / reactive / apparent power
Power factor
Frequency
Active and reactive energy
Harmonic distortion (THD)
2–31st order harmonics
 
CT Input Ratings:
Rated current (external CT):
5A secondary (default), measuring range 0–6A
1A secondary (optional), measuring range 0–1.2A
Compatible with external CT ratios such as:
5/5A
100/5A
400/5A
800/5A
External CTs are required – this is a CT-operated meter
 
Accuracy:
Voltage: ±0.2%
Current: ±0.2%
Active Power: ±0.5%
Reactive Power: ±2.0%
Active Energy: Class 0.5S
Frequency: ±0.02 Hz
 
Electrical Parameters:
Operating Voltage: 85–305VAC / 70–430VDC
Frequency Range: 45–65 Hz
Power Consumption:
Voltage circuit: <3VA
Current circuit: <0.75VA per phase
 
Environmental Specifications:
Operating Temperature: –30°C to +75°C
Storage Temperature: –25°C to +70°C
Relative Humidity: 5% – 95% (non-condensing)
Altitude: ≤3000 m
 
Mechanical & Installation:
DIN 35mm rail mounted
Compact modular design
Ideal for panel boards and distribution boards
Dimensions: 88 mm (H) × 75 mm (W) × 74 mm (D)
LCD display with backlight
 
Applications:
Energy management systems
Building automation
Industrial power monitoring
Retrofit upgrades
Smart metering platforms
Power quality monitoring
Projects with limited installation space
 
Optional Configurations:
Model options include:
KPM37-Wi – WiFi communication
KPM37-4G – 4G LTE communication
KPM37-L – LoRa communication
KPM37-K – Digital inputs
KPM37-R – Relay outputs
KPM37-T – Temperature inputs
KPM37-S – Residual current measurement
(Custom configurations available – specify options when ordering)
 
Key Advantages:
High accuracy and stability
Multiple communication options
Expandable I/O functionality
No external modem required for WiFi or 4G versions
Ideal for smart metering and IoT integration
Reliable performance in harsh environments
 
Lead Time:
3-5 Days