Three-phase digital active energy meter ZAMEL LEM-50 100 A, direct connection

ZAMEL LEM-50 is a three-phase digital active energy meter designed for direct connection on systems up to 100 A. The meter measures and displays active energy (kWh) per phase and total consumption on a clear digital screen. It provides a pulse output for integration with remote telemetry or building management systems. The compact DIN-rail housing and straightforward wiring make it suitable for residential, commercial and light industrial installations where accurate energy accounting is required.

Advantages

The LEM-50 offers precise active energy measurement across three phases with separate phase and total registers, a readable digital display and a pulse output for external monitoring. Its direct-connect design simplifies installation in distribution boards without the need for external current transformers for loads up to the rated current. The device uses standard DIN-rail mounting, ensuring compatibility with common electrical enclosures and straightforward replacement or upgrade of existing meters.

Suitable for (tasks / use cases)

• Residential apartment blocks and multi-dwelling units for tenant consumption accounting
• Commercial premises such as shops, offices and restaurants for monthly energy monitoring
• Light industrial or workshop distribution boards where loads do not exceed the direct connection limit
• Integration with building management systems and energy telemetry via pulse output

When it may not be suitable

This direct-connection meter is not designed for systems with currents exceeding the rated 100 A; installations above that limit normally require meters with external current transformers. It also measures active energy only; applications that require reactive energy, harmonic analysis or advanced power quality diagnostics will need a more feature-rich instrument.

Key specifications

• Measurement: three-phase active energy (kWh), per-phase and total
• Connection type: direct connection for conductors up to the specified current rating
• Rated current: suitable for single- and three-phase systems up to the stated current limit
• Display: digital LCD/LED readout showing energy registers
• Outputs: pulse output for external telemetry or data acquisition
• Mounting: DIN-rail enclosure compatible with standard distribution boards

How to use

Install the meter on a standard DIN rail in the distribution board and connect phase and neutral conductors according to the wiring diagram provided by the manufacturer. Verify that the system current does not exceed the meter's direct-connection rating before switching on. Use the digital display to read per-phase and total energy consumption. Connect the pulse output to a compatible counter or telemetry input for remote energy logging. Follow local electrical codes and switch off supply power while making connections.

What to consider before purchase

• Ensure the meter's maximum direct-connection current rating matches or exceeds your system's maximum load
• Confirm that only active energy (kWh) measurement meets your monitoring requirements; reactive measurements are not provided
• Check physical dimensions and DIN-rail space in the distribution board for proper installation
• Verify compatibility of the pulse output with your telemetry or energy management hardware

Usage recommendations

For reliable readings, have the installation performed by a qualified electrician, confirm proper wiring and protective devices, and periodically verify the display and pulse output operation as part of preventive maintenance.