Finder 7E.85.8.400.0310 – 7E Series Energy Meters

Why Choose the Finder 7E.85.8.400.0310 Three-Phase M-Bus Energy Meter?

The Finder 7E.85.8.400.0310 is a high-accuracy three-phase multifunction bi-directional energy meter designed for professional electricity monitoring, industrial energy management and building automation applications. Part of the Finder Series 7E, this advanced digital electricity meter combines current transformer (CT) measurement, an integrated M-Bus communication interface, single-tariff energy measurement and two S0 pulse outputs in a compact DIN rail mounted housing.

Designed for three-phase electrical systems with or without a neutral conductor, the Finder 7E.85.8.400.0310 provides comprehensive monitoring of electricity consumption, energy export and electrical network performance. Its nominal 3 × 230/400 V AC measurement voltage, 1 A reference current and 6 A maximum measurement input current make it suitable for indirect electricity measurement through appropriately selected current transformers.

With support for current transformer ratios corresponding to primary currents of up to 10,000 A, this three-phase electricity meter is particularly useful for monitoring larger commercial and industrial electrical installations. Its MID-certified Class C (0.5S) active energy accuracy supports precise measurement in demanding electrical environments.

The integrated M-Bus interface allows measured energy values and electrical parameters to be transmitted to compatible building management systems, energy monitoring gateways and data acquisition platforms. Combined with bi-directional energy measurement, a backlit LCD display and configurable pulse outputs, the Finder 7E.85.8.400.0310 provides a practical solution for modern electrical energy monitoring.

Key Advantages

• Three-phase multifunction energy meter for industrial and commercial electricity monitoring.
• Bi-directional energy measurement for monitoring imported and exported electricity.
• MID-certified Class C (0.5S) accuracy for high-precision active energy measurement.
• Integrated M-Bus communication for remote monitoring and energy data collection.
• Single-tariff configuration for straightforward energy consumption monitoring.
• Current transformer operated for indirect measurement of higher-current electrical installations.
• Supports suitable CT ratios up to 10,000 A primary current.
• 1 A reference current and 6 A maximum measurement current at the meter inputs.
• 3 × 230/400 V AC nominal measurement voltage for compatible three-phase networks.
• Three-phase three-wire and four-wire compatibility for flexible installation.
• Two S0 pulse outputs for integration with compatible pulse-counting equipment.
• Backlit LCD display for convenient local reading.
• Active and reactive energy measurement for detailed electricity analysis.
• Voltage, current, frequency, power and power factor monitoring.
• Total harmonic distortion (THD) measurement for additional electrical network analysis.
• 35 mm DIN rail mounting for convenient installation in electrical cabinets.
• Four-module housing for compact electrical distribution panels.
• Suitable for building management systems, industrial sub-metering, energy monitoring and renewable generation installations.

Key Features

• Finder Series 7E multifunction electricity meter.
• Product type: Three-phase bi-directional energy meter.
• Measurement method: Indirect measurement using external current transformers.
• Nominal voltage: 3 × 230/400 V AC.
• Nominal frequency: 50/60 Hz.
• Reference current: 1 A.
• Maximum measurement input current: 6 A.
• Minimum measured current: 0.05 A.
• Starting current: 0.005 A.
• Active energy accuracy: Class C / 0.5S.
• Reactive energy accuracy: Class 2.
• MID certification for applicable metering applications.
• Communication interface: M-Bus.
• Communication standard: EN 13757-3.
• Pulse outputs: 2 × S0.
• Tariff configuration: Single tariff.
• Energy measurement: Bi-directional import and export.
• Display: Backlit LCD.
• Installation: Three-phase three-wire or four-wire systems.
• Mounting: 35 mm DIN rail.
• Housing width: Approximately 72 mm.
• Operating ambient temperature: −40 to +70 °C.

Advanced Bi-Directional Three-Phase Energy Measurement

The Finder 7E.85.8.400.0310 is designed to measure electrical energy flowing in both directions through a compatible three-phase installation. This allows users to monitor energy imported from an electricity supply and energy exported from installations incorporating suitable on-site generation equipment.

Bi-directional energy measurement is particularly valuable in commercial buildings, manufacturing facilities and renewable energy installations where electricity may be both consumed and generated. Separate import and export measurements help provide a clearer understanding of the site's electrical energy balance.

The meter supports measurement of active energy in kWh and reactive energy in kvarh, alongside instantaneous electrical quantities such as voltage, current, active power, apparent power, reactive power, frequency and power factor.

Its ability to monitor total harmonic distortion (THD) provides additional information about the electrical network. THD measurements can help engineers assess the presence of harmonic distortion associated with non-linear electrical loads, although the meter is not a substitute for a dedicated power quality analyser where detailed harmonic investigations are required.

With Class C / 0.5S active energy accuracy and MID certification, the Finder 7E.85.8.400.0310 is suitable for applications requiring precise electrical energy measurement, subject to the applicable metering regulations and installation requirements.

Current Transformer Measurement for High-Current Installations

Unlike direct-connected electricity meters, the Finder 7E.85.8.400.0310 uses external current transformers (CTs) to measure electrical current. These transformers convert the higher currents flowing through the monitored conductors into lower secondary currents suitable for the meter's measurement inputs.

The meter has a 1 A reference current and a 6 A maximum measurement input current. When configured with suitable current transformers, it can monitor installations with primary currents up to 10,000 A.

This indirect measurement arrangement makes the Finder 7E.85.8.400.0310 particularly suitable for larger electrical distribution systems, industrial machinery and commercial installations where direct-connected meters would not be appropriate.

The current transformer ratio must be configured correctly so that the displayed and communicated values accurately represent the electrical installation. Incorrect CT ratios, polarity or phase association can lead to inaccurate readings or incorrect identification of import and export energy.

For MID-controlled installations, the current transformer configuration must comply with the manufacturer's instructions and applicable metering requirements.

Important safety information: Current transformer secondary circuits must be installed and maintained using appropriate electrical safety procedures. A CT secondary must not be left open-circuit while its primary conductor is energised.

Integrated M-Bus Communication for Building Energy Management

The Finder 7E.85.8.400.0310 incorporates an M-Bus communication interface designed for remote electricity monitoring and integration with compatible energy management systems.

M-Bus, or Meter-Bus, is a communication system widely used for utility metering and building services applications. It allows compatible meters to communicate measurement data to central collection equipment, making it particularly useful for installations that require automated energy reporting.

The meter's M-Bus communication implementation is compatible with EN 13757-3 and supports configurable baud rates of 600, 1200, 2400, 4800 and 9600 bps.

Its configurable M-Bus primary address range of 001–250 allows the device to be integrated into appropriately designed multi-meter networks. Secondary addressing provides additional flexibility when identifying devices on a compatible M-Bus system.

When connected to a suitable M-Bus master or energy monitoring gateway, the meter can provide data for electricity consumption analysis, operational reporting and building energy management.

Important: The Finder 7E.85.8.400.0310 uses M-Bus communication, not RS485 Modbus RTU. The two protocols are not directly interchangeable, and a suitable interface or gateway is required when integrating an M-Bus meter into a system that only supports Modbus.

Single-Tariff Energy Monitoring

The Finder 7E.85.8.400.0310 is the single-tariff version of Finder's M-Bus-enabled Type 7E.85 energy meter.

Its single-tariff configuration is ideal for installations where energy consumption is recorded using one tariff register rather than being separated into multiple tariff periods.

This makes it suitable for industrial sub-metering, energy performance monitoring, building services measurement and installations where tariff switching is not required.

For applications requiring two tariff registers, the corresponding Finder 7E.85.8.400.0312 model provides dual-tariff functionality while retaining the M-Bus communication interface.

Choosing the correct tariff version at the design stage helps ensure that the meter provides the functionality required by the monitoring system.

Two S0 Pulse Outputs for Flexible Monitoring Integration

In addition to its M-Bus communication interface, the Finder 7E.85.8.400.0310 provides two S0 pulse outputs for integration with compatible monitoring equipment.

S0 pulse outputs allow energy-related information to be represented as electrical pulses that can be counted by suitable controllers, data loggers or energy monitoring interfaces.

Finder's Type 7E.85 range includes a programmable pulse output, supporting flexible energy monitoring arrangements. Pulse output configuration should follow the manufacturer's instructions and the requirements of the connected equipment.

The combination of M-Bus communication and S0 pulse outputs makes the meter suitable for both digital network integration and pulse-based energy monitoring systems.

DIN Rail Installation and Electrical Integration

The Finder 7E.85.8.400.0310 is designed for mounting on a standard 35 mm DIN rail within a suitable electrical distribution board or industrial control cabinet.

Its compact dimensions of approximately 71.9 × 99.4 × 59.6 mm allow it to occupy approximately four standard modular positions.

The meter can be configured for compatible three-phase three-wire or four-wire electrical networks. Correct wiring and network configuration are essential to ensure accurate energy measurement.

The voltage measurement connections and external current transformers must be installed according to the manufacturer's wiring diagrams. Each current transformer must be connected to the appropriate phase with the correct polarity and configured with the correct transformation ratio.

The device also requires an appropriate auxiliary supply. The manufacturer's documentation specifies an auxiliary supply operating range of 100–480 V AC or 140–680 V DC.

For M-Bus communication, the meter must be connected to a compatible M-Bus master or gateway using suitable cabling and network installation practices.

Electrical installation and commissioning should be carried out by suitably qualified personnel. The meter is a measurement device and does not replace circuit breakers, isolators or other required electrical protection equipment.

Typical Applications

• Three-phase industrial electricity monitoring.
• Commercial building energy management systems.
• Industrial plant and machinery energy measurement.
• Bi-directional electricity import and export monitoring.
• Photovoltaic and distributed generation monitoring.
• Factory and production line energy analysis.
• Electrical distribution board sub-metering.
• Current transformer operated high-current installations.
• M-Bus building management system integration.
• Automated meter reading and energy data collection.
• Single-tariff electricity consumption monitoring.
• Industrial energy efficiency programmes.
• Electrical parameter and THD monitoring.
• Energy reporting and operational cost allocation.
• Commercial and industrial facility management.
• Multi-meter monitoring networks using compatible M-Bus gateways.