Finder 7E.86.8.400.0312 – 7E Series Energy Meters

Finder 7E.86.8.400.0312 – Three-Phase MID Energy Meter with M-Bus, Dual Tariff and CT Measurement

The Finder 7E.86.8.400.0312 is a multifunction three-phase digital energy meter designed for accurate electricity consumption monitoring in industrial, commercial and building management applications. Part of the Finder 7E Series, this MID-certified energy meter combines bidirectional energy measurement, dual-tariff monitoring, an integrated M-Bus communication interface and a programmable S0 pulse output.

Designed for 3 × 230/400 V AC, 50/60 Hz electrical systems, the Finder 7E.86.8.400.0312 supports three-phase installations with either three or four wires. It has a 1 A reference current and a 6 A maximum measurement current, making it suitable for use with appropriately selected current transformers (CTs).

With compatible current transformers, the meter can be configured to monitor electrical systems with substantially higher primary currents, supporting measurement applications up to 50,000 A within the manufacturer's specified configuration limits. Its programmable CT settings allow measurements to reflect the primary circuit rather than simply the current passing through the meter's measurement terminals.

An eight-digit backlit LCD display provides access to energy consumption and instantaneous electrical measurements, while the integrated M-Bus interface enables connection to compatible remote monitoring and building management systems. The meter also provides dual-tariff energy recording, bidirectional measurement and phase-related diagnostic information.

The Finder 7E.86.8.400.0312 is a practical solution for electrical engineers, energy managers, facilities teams and control panel manufacturers requiring reliable three-phase energy monitoring with wired communications and current transformer compatibility.

Key Advantages

• Three-phase energy monitoring supports industrial and commercial electrical installations.
• MID-certified measurement provides recognised metering accuracy for appropriate applications.
• Integrated M-Bus interface enables communication with compatible remote monitoring systems.
• Current transformer compatibility allows monitoring of electrical circuits with currents beyond the meter's direct measurement range.
• Programmable CT settings support accurate scaling of measurements for the installed transformers.
• Dual-tariff measurement records electricity consumption separately for tariff periods T1 and T2.
• Bidirectional measurement supports monitoring of imported and exported electrical energy.
• Multifunction electrical monitoring displays voltage, current, power, power factor and frequency.
• Eight-digit backlit LCD makes readings accessible at the meter.
• Programmable S0 pulse output supports connection to compatible pulse-counting equipment.
• Three- or four-wire configuration provides flexibility for different three-phase electrical systems.
• Phase monitoring functions help identify phase loss and incorrect phase sequence.
• 35 mm DIN rail mounting simplifies installation inside suitable electrical enclosures.
• Four-module housing provides a compact format for multifunction energy monitoring.

Key Features

• Finder 7E Series multifunction energy meter.
• Three-phase electrical energy measurement.
• MID-certified construction.
• Integrated wired M-Bus communication interface.
• Programmable S0 pulse output.
• Dual-tariff measurement for T1 and T2.
• Bidirectional energy measurement for import and export monitoring.
• 3 × 230/400 V AC nominal electrical system.
• 50/60 Hz operating frequency.
• Three- or four-wire system compatibility.
• 1 A reference current.
• 6 A maximum measurement current.
• Current transformer measurement capability.
• Programmable CT secondary settings.
• Measurement capability up to 50,000 A using suitable current transformers and configuration.
• Eight-digit backlit LCD display.
• Active energy measurement in kWh.
• Apparent energy measurement in kVAh.
• Reactive energy measurement in kvarh.
• Instantaneous voltage and current readings.
• Active, apparent and reactive power monitoring.
• Power factor and frequency display.
• Power-flow direction indication.
• Phase loss and phase sequence fault indication.
• Active energy accuracy Class B according to EN 50470-3.
• Reactive energy accuracy Class 2 according to EN 62053-23.
• 35 mm DIN rail mounting according to EN 60715.
• IP50 protection rating for the meter housing.

How the Finder 7E.86 Three-Phase Energy Meter Works

The Finder 7E.86.8.400.0312 measures electrical energy consumption by monitoring the voltage and current associated with a three-phase electrical installation.

The meter calculates electrical energy from the measured electrical quantities over time, allowing users to monitor consumption and analyse the performance of connected equipment.

Unlike a high-current direct-connected meter, the Finder 7E.86.8.400.0312 is particularly suited to current transformer-based measurement. Current transformers reduce the primary circuit current to a suitable secondary current that the meter can measure.

By configuring the correct CT parameters, the meter can display measurements corresponding to the actual primary circuit. This makes it suitable for monitoring larger electrical installations without routing the full load current directly through the meter.

The device supports both three-wire and four-wire three-phase systems, providing installation flexibility for different electrical distribution arrangements.

Current Transformer Measurement for High-Current Installations

A major advantage of the Finder 7E.86.8.400.0312 is its ability to work with suitable current transformers (CTs).

The meter has a 1 A reference current and a 6 A maximum measurement current. In CT-based installations, the primary current is converted to a lower secondary current within the meter's supported measurement range.

The manufacturer's specifications identify measurement capability up to 50,000 A when appropriately configured with suitable current transformers.

Correct CT selection is essential. The transformer ratio, secondary current, accuracy, burden and installation arrangement must be compatible with the meter and the required measurement performance.

Current transformer secondary circuits must be installed and maintained using appropriate safety procedures. A CT secondary must not be left open-circuit while its primary conductor is energised unless the transformer and installation are specifically designed for that condition.

Integrated M-Bus Communication for Remote Energy Monitoring

The Finder 7E.86.8.400.0312 incorporates a wired M-Bus communication interface, enabling it to exchange metering information with compatible data collection and building management equipment.

M-Bus is commonly used in utility metering and building energy monitoring systems, making this model suitable for installations where energy data needs to be collected from multiple meters.

Through a compatible M-Bus master or gateway, energy readings can be integrated into monitoring software, building management systems or wider energy reporting platforms.

The meter's M-Bus communication parameters and available data can be configured using the manufacturer's supported tools and documentation.

Important: M-Bus is not the same as Modbus RS485. Systems requiring Modbus communication should use a suitable Modbus-compatible meter or gateway.

Dual-Tariff and Bidirectional Energy Measurement

The Finder 7E.86.8.400.0312 supports dual-tariff energy measurement, allowing consumption to be recorded separately for tariff periods T1 and T2.

This functionality can be useful where electricity usage needs to be analysed across different tariff periods, operating schedules or energy management arrangements.

The meter also supports bidirectional energy measurement, allowing it to distinguish between energy imported from the supply and energy exported in the opposite direction.

This makes it suitable for compatible installations involving distributed generation, energy recovery or other systems where electrical power may flow in more than one direction.

Its multifunction display can present total and partial energy readings, including active, apparent and reactive energy measurements, for the overall system or individual phases.

Programmable S0 Pulse Output

In addition to M-Bus communications, the Finder 7E.86.8.400.0312 provides a programmable S0 pulse output.

An S0 output generates electrical pulses associated with measured energy, allowing compatible pulse counters, monitoring modules and data acquisition equipment to record consumption.

This provides an additional method of integrating the meter into existing monitoring systems where a pulse input is available.

The pulse output settings and electrical interface requirements should be checked against Finder's documentation and the connected monitoring equipment.

Backlit LCD Display and Electrical Diagnostics

The Finder 7E.86.8.400.0312 features an eight-digit backlit LCD display, providing convenient access to electrical measurements without requiring a separate monitoring device.

Users can scroll through measurements including voltage, current, active power, apparent power, reactive power, power factor and frequency.

The meter also indicates power-flow direction and provides diagnostic information for conditions such as phase loss or incorrect phase sequence.

These functions make it useful not only for recording energy consumption but also for understanding the operating characteristics of a three-phase electrical installation.

DIN Rail Installation and Metering Considerations

The Finder 7E.86.8.400.0312 is designed for 35 mm DIN rail mounting in accordance with EN 60715, allowing installation inside suitable electrical distribution boards, industrial control cabinets and metering enclosures.

The meter occupies four modular spaces and uses screw terminal electrical connections.

Installation should be carried out by a competent electrical professional, with particular attention to the correct three-phase wiring configuration, voltage connections, CT polarity, CT ratio settings and communications wiring.

For installations requiring MID-compliant measurement, the meter must be selected, configured and installed in accordance with the applicable regulations and the manufacturer's instructions.

The device is a measurement instrument, not a protective circuit breaker or an electrical isolator. Suitable circuit protection and isolation must be provided separately.

Typical Applications

• Industrial three-phase energy monitoring.
• Commercial building electricity metering.
• Factory and manufacturing energy management.
• Building management systems using M-Bus.
• Current transformer-based electrical metering.
• Electrical distribution board monitoring.
• Industrial machinery energy consumption analysis.
• Multi-tariff electricity monitoring.
• Import and export energy measurement.
• Sub-metering in suitable commercial and industrial installations.
• Energy efficiency and consumption reporting.
• Facilities management and building services.
• Remote meter reading and data collection.
• Compatible pulse-based monitoring systems.
• Three-phase electrical system diagnostics.